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www.fitspresso-co.com

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wheelchairindia9

Karma KM 2500 - 0 views

www.heavydutywheelchair.in/...KM-2500-Small-Wheel-Wheelchair

KM 2500 Small Wheel Designed For Disabled people KM 2500 Wheelchair armrest design is ergonomic Karma KM 2500 Wheelchair Karma KM 2500 wheelchairs have fixed armrests battery is smaller in size

shared by wheelchairindia9 on 21 Oct 15 - No Cached
  • wheelchairindia9 on 21 Oct 15
     
    Many travel wheelchairs are manual wheelchairs. They may have a weight capacity that they can handle which a consumer should research before thinking of purchasing a specific model. There are also lightweight wheelchairs which have a light battery and are powered. These ultra light wheelchairs do not have a full sized battery like most power wheelchairs but are still able to provide assistance without a person having to manually gain momentum. Travel Wheelchair that are motorized are also known to be extremely easy to maneuver in tight situations. They are smaller in size and can usually only hold a person up to maximum weight. Most lightweight wheelchairs are folding wheelchairs or can be broken down into pieces for transport. Although some of the travel wheelchairs that have batteries may be heavier than manual ultra light wheelchairs, they are still light enough in weight to be lifted into the trunk of a car for transport. Since the battery is smaller in size than an average powered wheelchair, travel wheelchairs that are motorized can generally only make it about before the battery needs to be charged. Karma KM 2500 Small Wheel Wheelchair: Karma KM 2500 Small Wheel Wheelchair Specifications: Width 18" Front/Rear Wheels 6" to 14" Seat Width 47cm Seat Depth 40cm Overall Width 66cm Overall Collapsed Width 36cm Armrest Height 21cm Overall Length 90cm Seat Height 47cm Backrest Height 38cm Overall Height 86cm Weight 9.2 k.g. Karma KM 2500 Small Wheel Wheelchair Seat and Back: AEGIS Microbe Shield Approved by the FDA, EPA, EU, etc., bonded anti-microbial barrier upholstery protects from odor, staining and deterioration from bacteria, fungus and other microorganisms. It is a shield for your health. Karma KM 2500 Small Wheel Wheelchair Extended Armrest: By simulating the natural position of arms, the extended armrest design is ergonomic and creates bigger seating space. An Ultra lightweight wheelchair (9.2 kg) with a compact
Nathan Goodyear

Stuck at the bench: Potential natural neuroprotective compounds for concussion - 0 views

www.ncbi.nlm.nih.gov/...PMC3205506

concussions concussion natural therapies brain curcumin omega 3 resveratrol green tea EGCG EPA DHA vitamin E vitamin c vitamin D

shared by Nathan Goodyear on 20 Feb 16 - No Cached
  • Long-chain polyunsaturated fatty acids, including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), are highly enriched in neuronal synaptosomal plasma membranes and vesicles
  • The predominant CNS polyunsaturated fatty acid is DHA
  • effective supplementation and/or increased ingestion of dietary sources rich in EPA and DHA, such as cold-water fish species and fish oil, may help improve a multitude of neuronal functions, including long-term potentiation and cognition.
  • ...45 more annotations...
  • multiple preclinical studies have suggested that DHA and/or EPA supplementation may have potential benefit through a multitude of diverse, but complementary mechanisms
  • pre-injury dietary supplementation with fish oil effectively reduces post-traumatic elevations in protein oxidation
  • The benefits of pre-traumatic DHA supplementation have not only been independently confirmed,[150] but DHA supplementation has been shown to significantly reduce the number of swollen, disconnected and injured axons when administered following traumatic brain injury.
  • DHA has provided neuroprotection in experimental models of both focal and diffuse traumatic brain injury
  • potential mechanisms of neuroprotection, in addition to DHA and EPA's well-established anti-oxidant and anti-inflammatory properties
  • Despite abundant laboratory evidence supporting its neuroprotective effects in experimental models, the role of dietary DHA and/or EPA supplementation in human neurological diseases remains uncertain
  • Several population-based, observational studies have suggested that increased dietary fish and/or omega-3 polyunsaturated fatty acid consumption may reduce risk for ischemic stroke in several populations
  • Randomized control trials have also demonstrated significant reductions in ischemic stroke recurrence,[217] relative risk for ischemic stroke,[2] and reduced incidence of both symptomatic vasospasm and mortality following subarachnoid hemorrhage
  • Clinical trials in Alzheimer's disease have also been largely ineffective
  • The clinical evidence thus far appears equivocal
  • curcumin has gained much attention from Western researchers for its potential therapeutic benefits in large part due to its potent anti-oxidant[128,194,236] and anti-inflammatory properties
  • Curcumin is highly lipophilic and crosses the blood-brain barrier enabling it to exert a multitude of different established neuroprotective effects
  • in the context of TBI, a series of preclinical studies have suggested that pre-traumatic and post-traumatic curcumin supplementation may bolster the brain's resilience to injury and serve as a valuable therapeutic option
  • Curcumin may confer significant neuroprotection because of its ability to act on multiple deleterious post-traumatic, molecular cascades
  • studies demonstrated that both pre- and post-traumatic curcumin administration resulted in a significant reduction of neuroinflammation via inhibition of the pro-inflammatory molecules interleukin 1β and nuclear factor kappa B (NFκB)
  • no human studies have been conducted with respect to the effects of curcumin administration on the treatment of TBI, subarachnoid or intracranial hemorrhage, epilepsy or stroke
  • studies have demonstrated that resveratrol treatment reduces brain edema and lesion volume, as well as improves neurobehavioral functional performance following TBI
  • green tea consumption or supplementation with its derivatives may bolster cognitive function acutely and may slow cognitive decline
  • At least one population based study, though, did demonstrate that increased green tea consumption was associated with a reduced risk for Parkinson's disease independent of total caffeine intake
  • a randomized, placebo-controlled trial demonstrated that administration of green tea extract and L-theanine, over 16 weeks of treatment, improved indices of memory and brain theta wave activity on electroencephalography, suggesting greater cognitive alertness
  • Other animal studies have also demonstrated that theanine, another important component of green tea extract, exerts a multitude of neuroprotective benefits in experimental models of ischemic stroke,[63,97] Alzheimer's disease,[109] and Parkinson's disease
  • Theanine, like EGCG, contains multiple mechanisms of neuroprotective action including protection from excitotoxic injury[97] and inhibition of inflammation
  • potent anti-oxidant EGCG which is capable of crossing the blood-nerve and blood-brain barrier,
  • Epigallocatechin-3-gallate also displays neuroprotective properties
  • More recent research has suggested that vitamin D supplementation and the prevention of vitamin D deficiency may serve valuable roles in the treatment of TBI and may represents an important and necessary neuroprotective adjuvant for post-TBI progesterone therapy
  • Progesterone is one of the few agents to demonstrate significant reductions in mortality following TBI in human patients in preliminary trials
  • in vitro and in vivo studies have suggested that vitamin D supplementation with progesterone administration may significantly enhance neuroprotection
  • Vitamin D deficiency may increase inflammatory damage and behavioral impairment following experimental injury and attenuate the protective effects of post-traumatic progesterone treatment.[37]
  • emerging evidence has suggested that daily intravenous administration of vitamin E following TBI significantly decreases mortality and improves patient outcomes
  • high dose vitamin C administration following injury stabilized or reduced peri-lesional edema and infarction in the majority of patients receiving post-injury treatment
  • it has been speculated that combined vitamin C and E therapy may potentiate CNS anti-oxidation and act synergistically with regards to neuroprotection
  • one prospective human study has found that combined intake of vitamin C and E displays significant treatment interaction and reduces the risk of stroke
  • Pycnogenol has demonstrated the ability to slow or reduce the pathological processes associated with Alzheimer's disease
  • Pcynogenol administration, in a clinical study of elderly patients, led to improved cognition and reductions in markers of lipid peroxidase
  • One other point of consideration is that in neurodegenerative disease states like Alzheimer's disease and Parkinson's disease, where there are high levels of reactive oxygen species generation, vitamin E can tend to become oxidized itself. For maximal effectiveness and to maintain its anti-oxidant capacity, vitamin E must be given in conjunction with other anti-oxidants like vitamin C or flavonoids
  • These various factors might account for the null effects of alpha-tocopherol supplementation in patients with MCI and Alzheimer's disease
  • preliminary results obtained in a pediatric population have suggested that post-traumatic oral creatine administration (0.4 g/kg) given within four hours of traumatic brain injury and then daily thereafter, may improve both acute and long-term outcomes
  • Acutely, post-traumatic creatine administration seemed to reduce duration of post-traumatic amnesia, length of time spent in the intensive care unit, and duration of intubation
  • At three and six months post-injury, subjects in the creatine treatment group demonstrated improvement on indices of self care, communication abilities, locomotion, sociability, personality or behavior and cognitive function when compared to untreated controls
  • patients in the creatine-treatment group were less likely to experience headaches, dizziness and fatigue over six months of follow-up
  • CNS creatine is derived from both its local biosynthesis from the essential amino acids methionine, glycine and arginine
  • Studies of patients with CNS creatine deficiency and/or murine models with genetic ablation of creatine kinase have consistently demonstrated significant neurological impairment in the absence of proper creatine, phosphocreatine, or creatine kinase function; thus highlighting its functional importance
  • chronic dosing may partially reverse neurological impairments in human CNS creatine deficiency syndromes
  • Several studies have suggested that creatine supplementation may also reduce oxidative DNA damage and brain glutamate levels in Huntington disease patients
  • Another study highlighted that creatine supplementation marginally improved indices of mood and reduced the need for increased dopaminergic therapy in patients with Parkinson's disease
  • Nathan Goodyear on 20 Feb 16
     
    great review of natural therapies in the treatment of concussions
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Nathan Goodyear

Testosterone and the Cardiovascular System: A Comprehensive Review of the Clinical Lite... - 0 views

jaha.ahajournals.org/...e000272.full

Testosterone men male cardiovascular disease low T

shared by Nathan Goodyear on 20 Nov 13 - No Cached
  • Low endogenous bioavailable testosterone levels have been shown to be associated with higher rates of all‐cause and cardiovascular‐related mortality.39,41,46–47 Patients suffering from CAD,13–18 CHF,137 T2DM,25–26 and obesity27–28
  • have all been shown to have lower levels of endogenous testosterone compared with those in healthy controls. In addition, the severity of CAD15,17,29–30 and CHF137 correlates with the degree of testosterone deficiency
  • In patients with CHF, testosterone replacement therapy has been shown to significantly improve exercise tolerance while having no effect on LVEF
  • ...66 more annotations...
  • testosterone therapy causes a shift in the skeletal muscle of CHF patients toward a higher concentration of type I muscle fibers
  • Testosterone replacement therapy has also been shown to improve the homeostatic model of insulin resistance and hemoglobin A1c in diabetics26,68–69 and to lower the BMI in obese patients.
  • Lower levels of endogenous testosterone have been associated with longer duration of the QTc interval
  • testosterone replacement has been shown to shorten the QTc interval
  • negative correlation has been demonstrated between endogenous testosterone levels and IMT of the carotid arteries, abdominal aorta, and thoracic aorta
  • These findings suggest that men with lower levels of endogenous testosterone may be at a higher risk of developing atherosclerosis.
  • Current guidelines from the Endocrine Society make no recommendations on whether patients with heart disease should be screened for hypogonadism and do not recommend supplementing patients with heart disease to improve survival.
  • The Massachusetts Male Aging Study also projects ≈481 000 new cases of hypogonadism annually in US men within the same age group
  • since 1993 prescriptions for testosterone, regardless of the formulation, have increased nearly 500%
  • Testosterone levels are lower in patients with chronic illnesses such as end‐stage renal disease, human immunodeficiency virus, chronic obstructive pulmonary disease, type 2 diabetes mellitus (T2DM), obesity, and several genetic conditions such as Klinefelter syndrome
  • A growing body of evidence suggests that men with lower levels of endogenous testosterone are more prone to develop CAD during their lifetimes
  • There are 2 major potential confounding factors that the older studies generally failed to account for. These factors are the subfraction of testosterone used to perform the analysis and the method used to account for subclinical CAD.
  • The biologically inactive form of testosterone is tightly bound to SHBG and is therefore unable to bind to androgen receptors
  • The biologically inactive fraction of testosterone comprises nearly 68% of the total testosterone in human serum
  • The biologically active subfraction of testosterone, also referred to as bioavailable testosterone, is either loosely bound to albumin or circulates freely in the blood, the latter referred to as free testosterone
  • It is estimated that ≈30% of total serum testosterone is bound to albumin, whereas the remaining 1% to 3% circulates as free testosterone
  • it can be argued that using the biologically active form of testosterone to evaluate the association with CAD will produce the most reliable results
  • English et al14 found statistically significant lower levels of bioavailable testosterone, free testosterone, and free androgen index in patients with catheterization‐proven CAD compared with controls with normal coronary arteries
  • patients with catheterization‐proven CAD had statistically significant lower levels of bioavailable testosterone
  • In conclusion, existing evidence suggests that men with CAD have lower levels of endogenous testosterone,13–18 and more specifically lower levels of bioavailable testosterone
  • low testosterone levels are associated with risk factors for CAD such as T2DM25–26 and obesity
  • In a meta‐analysis of these 7 population‐based studies, Araujo et al41 showed a trend toward increased cardiovascular mortality associated with lower levels of total testosterone, but statistical significance was not achieved (RR, 1.25
  • the authors showed that a decrease of 2.1 standard deviations in levels of total testosterone was associated with a 25% increase in the risk of cardiovascular mortality
  • the relative risk of all‐cause mortality in men with lower levels of total testosterone was calculated to be 1.35
  • higher risk of cardiovascular mortality is associated with lower levels of bioavailable testosterone
  • Existing evidence seems to suggest that lower levels of endogenous testosterone are associated with higher rates of all‐cause mortality and cardiovascular mortality
  • studies have shown that lower levels of endogenous bioavailable testosterone are associated with higher rates of all‐cause and cardiovascular mortality
  • It may be possible that using bioavailable testosterone to perform mortality analysis will yield more accurate results because it prevents the biologically inactive subfraction of testosterone from playing a potential confounding role in the analysis
  • The earliest published material on this matter dates to the late 1930s
  • the concept that testosterone replacement therapy improves angina has yet to be proven wrong
  • In more recent studies, 3 randomized, placebo‐controlled trials demonstrated that administration of testosterone improves myocardial ischemia in men with CAD
  • The improvement in myocardial ischemia was shown to occur in response to both acute and chronic testosterone therapy and seemed to be independent of whether an intravenous or transdermal formulation of testosterone was used.
  • testosterone had no effect on endothelial nitric oxide activity
  • There is growing evidence from in vivo animal models and in vitro models that testosterone induces coronary vasodilation by modulating the activity of ion channels, such as potassium and calcium channels, on the surface of vascular smooth muscle cells
  • Experimental studies suggest that the most likely mechanism of action for testosterone on vascular smooth muscle cells is via modulation of action of non‐ATP‐sensitive potassium ion channels, calcium‐activated potassium ion channels, voltage‐sensitive potassium ion channels, and finally L‐type calcium ion channels
  • Corona et al confirmed those results by demonstrating that not only total testosterone levels are lower among diabetics, but also the levels of free testosterone and SHBG are lower in diabetic patients
  • Laaksonen et al65 followed 702 Finnish men for 11 years and demonstrated that men in the lowest quartile of total testosterone, free testosterone, and SHBG were more likely to develop T2DM and metabolic syndrome.
  • Vikan et al followed 1454 Swedish men for 11 years and discovered that men in the highest quartile of total testosterone were significantly less likely to develop T2DM
  • authors demonstrated a statistically significant increase in the incidence of T2DM in subjects receiving gonadotropin‐releasing hormone antagonist therapy. In addition, a significant increase in the rate of myocardial infarction, stroke, sudden cardiac death, and development of cardiovascular disease was noted in patients receiving antiandrogen therapy.67
  • Several authors have demonstrated that the administration of testosterone in diabetic men improves the homeostatic model of insulin resistance, hemoglobin A1c, and fasting plasma glucose
  • Existing evidence strongly suggests that the levels of total and free testosterone are lower among diabetic patients compared with those in nondiabetics
  • insulin seems to be acting as a stimulant for the hypothalamus to secret gonadotropin‐releasing hormone, which consequently results in increased testosterone production. It can be argued that decreased stimulation of the hypothalamus in diabetics secondary to insulin deficiency could result in hypogonadotropic hypogonadism
  • BMI has been shown to be inversely associated with testosterone levels
  • This interaction may be a result of the promotion of lipolysis in abdominal adipose tissue by testosterone, which may in turn cause reduced abdominal adiposity. On the other hand, given that adipose tissue has a higher concentration of the enzyme aromatase, it could be that increased adipose tissue results in more testosterone being converted to estrogen, thereby causing hypogonadism. Third, increased abdominal obesity may cause reduced testosterone secretion by negatively affecting the hypothalamus‐pituitary‐testicular axis. Finally, testosterone may be the key factor in activating the enzyme 11‐hydroxysteroid dehydrogenase in adipose tissue, which transforms glucocorticoids into their inactive form.
  • increasing age may alter the association between testosterone and CRP. Another possible explanation for the association between testosterone level and CRP is central obesity and waist circumference
  • Bai et al have provided convincing evidence that testosterone might be able to shorten the QTc interval by augmenting the activity of slowly activating delayed rectifier potassium channels while simultaneously slowing the activity of L‐type calcium channels
  • consistent evidence that supplemental testosterone shortens the QTc interval.
  • Intima‐media thickness (IMT) of the carotid artery is considered a marker for preclinical atherosclerosis
  • Studies have shown that levels of endogenous testosterone are inversely associated with IMT of the carotid artery,126–128,32,129–130 as well as both the thoracic134 and the abdominal aorta
  • 1 study has demonstrated that lower levels of free testosterone are associated with accelerated progression of carotid artery IMT
  • another study has reported that decreased levels of total and bioavailable testosterone are associated with progression of atherosclerosis in the abdominal aorta
  • These findings suggest that normal physiologic testosterone levels may help to protect men from the development of atherosclerosis
  • Czesla et al successfully demonstrated that the muscle specimens that were exposed to metenolone had a significant shift in their composition toward type I muscle fibers
  • Type I muscle fibers, also known as slow‐twitch or oxidative fibers, are associated with enhanced strength and physical capability
  • It has been shown that those with advanced CHF have a higher percentage of type II muscle fibers, based on muscle biopsy
  • Studies have shown that men with CHF suffer from reduced levels of total and free testosterone.137 It has also been shown that reduced testosterone levels in men with CHF portends a poor prognosis and is associated with increased CHF mortality.138 Reduced testosterone has also been shown to correlate negatively with exercise capacity in CHF patients.
  • Testosterone replacement therapy has been shown to significantly improve exercise capacity, without affecting LVEF
  • the results of the 3 meta‐analyses seem to indicate that testosterone replacement therapy does not cause an increase in the rate of adverse cardiovascular events
  • Data from 3 meta‐analyses seem to contradict the commonly held belief that testosterone administration may increase the risk of developing prostate cancer
  • One meta‐analysis reported an increase in all prostate‐related adverse events with testosterone administration.146 However, when each prostate‐related event, including prostate cancer and a rise in PSA, was analyzed separately, no differences were observed between the testosterone group and the placebo group
  • the existing data from the 3 meta‐analyses seem to indicate that testosterone replacement therapy does not increase the risk of adverse cardiovascular events
  • the authors correctly point out the weaknesses of their study which include retrospective study design and lack of randomization, small sample size at extremes of follow‐up, lack of outcome validation by chart review and poor generalizability of the results given that only male veterans with CAD were included in this study
    • Nathan Goodyear
      Nathan Goodyear on 04 Dec 13
       
      The authors here present Total Testosterone as a "confounding" value
    • Nathan Goodyear
      Nathan Goodyear on 09 Dec 13
       
      This would be HSD-II
  • the studies that failed to find an association between testosterone and CRP used an older population group
  • low testosterone may influence the severity of CAD by adversely affecting the mediators of the inflammatory response such as high‐sensitivity C‐reactive protein, interleukin‐6, and tumor necrosis factor–α
  • Nathan Goodyear on 20 Nov 13
     
    Good review of Testosterone and CHD.  Low T is associated with increased all cause mortality and cardiovascular mortality, CAD, CHF, type II diabetes, obesity, increased IMT,  increased severity of CAD and CHF.  Testosterone replacement in men with low T has been shown to improve exercise tolerance in CHF, improve insulin resistance, improve HgbA1c and lower BMI in the obese.
Nathan Goodyear

Testosterone: a vascular hormone in health and disease - 0 views

joe.endocrinology-journals.org/...R47.full

testosterone hormone health disease hormones men male cardiovascular disease CVD

shared by Nathan Goodyear on 13 May 13 - No Cached
  • Testosterone has beneficial effects on several cardiovascular risk factors, which include cholesterol, endothelial dysfunction and inflammation
  • In clinical studies, acute and chronic testosterone administration increases coronary artery diameter and flow, improves cardiac ischaemia and symptoms in men with chronic stable angina and reduces peripheral vascular resistance in chronic heart failure.
  • testosterone is an L-calcium channel blocker and induces potassium channel activation in vascular smooth muscle cells
  • ...54 more annotations...
  • Animal studies have consistently demonstrated that testosterone is atheroprotective, whereas testosterone deficiency promotes the early stages of atherogenesis
  • there is no compelling evidence that testosterone replacement to levels within the normal healthy range contributes adversely to the pathogenesis of CVD (Carson & Rosano 2011) or prostate cancer (Morgentaler & Schulman 2009)
  • bidirectional effect between decreased testosterone concentrations and disease pathology exists as concomitant cardiovascular risk factors (including inflammation, obesity and insulin resistance) are known to reduce testosterone levels and that testosterone confers beneficial effects on these cardiovascular risk factors
  • Achieving a normal physiological testosterone concentration through the administration of testosterone replacement therapy (TRT) has been shown to improve risk factors for atherosclerosis including reducing central adiposity and insulin resistance and improving lipid profiles (in particular, lowering cholesterol), clotting and inflammatory profiles and vascular function
  • It is well known that impaired erectile function and CVD are closely related in that ED can be the first clinical manifestation of atherosclerosis often preceding a cardiovascular event by 3–5 years
  • no decrease in the response (i.e. no tachyphylaxis) of testosterone and that patient benefit persists in the long term.
  • free testosterone levels within the physiological range, has been shown to result in a marked increase in both flow- and nitroglycerin-mediated brachial artery vasodilation in men with CAD
  • Clinical studies, however, have revealed either small reductions of 2–3 mm in diastolic pressure or no significant effects when testosterone is replaced within normal physiological limits in humans
  • Endothelium-independent mechanisms of testosterone are considered to occur primarily via the inhibition of voltage-operated Ca2+ channels (VOCCs) and/or activation of K+ channels (KCs) on smooth muscle cells (SMCs)
  • Testosterone shares the same molecular binding site as nifedipine
  • Testosterone increases the expression of endothelial nitric oxide synthase (eNOS) and enhances nitric oxide (NO) production
  • Testosterone also inhibited the Ca2+ influx response to PGF2α
  • one of the major actions of testosterone is on NO and its signalling pathways
  • In addition to direct effects on NOS expression, testosterone may also affect phosphodiesterase type 5 (PDE5 (PDE5A)) gene expression, an enzyme controlling the degradation of cGMP, which acts as a vasodilatory second messenger
  • the significance of the action of testosterone on VSMC apoptosis and proliferation in atherosclerosis is difficult to delineate and may be dependent upon the stage of plaque development
  • Several human studies have shown that carotid IMT (CIMT) and aortic calcification negatively correlate with serum testosterone
  • t long-term testosterone treatment reduced CIMT in men with low testosterone levels and angina
  • neither intracellular nor membrane-associated ARs are required for the rapid vasodilator effect
  • acute responses appear to be AR independent, long-term AR-mediated effects on the vasculature have also been described, primarily in the context of vascular tone regulation via the modulation of gene transcription
  • Testosterone and DHT increased the expression of eNOS in HUVECs
  • oestrogens have been shown to activate eNOS and stimulate NO production in an ERα-dependent manner
  • Several studies, however, have demonstrated that the vasodilatory actions of testosterone are not reduced by aromatase inhibition
  • non-aromatisable DHT elicited similar vasodilation to testosterone treatment in arterial smooth muscle
  • increased endothelial NOS (eNOS) expression and phosphorylation were observed in testosterone- and DHT-treated human umbilical vein endothelial cells
  • Androgen deprivation leads to a reduction in neuronal NOS expression associated with a decrease of intracavernosal pressure in penile arteries during erection, an effect that is promptly reversed by androgen replacement therapy
  • Observational evidence suggests that several pro-inflammatory cytokines (including interleukin 1β (IL1β), IL6, tumour necrosis factor α (TNFα), and highly sensitive CRP) and serum testosterone levels are inversely associated in patients with CAD, T2DM and/or hypogonadism
  • patients with the highest IL1β concentrations had lower endogenous testosterone levels
  • TRT has been reported to significantly reduce TNFα and elevate the circulating anti-inflammatory IL10 in hypogonadal men with CVD
  • testosterone treatment to normalise levels in hypogonadal men with the MetS resulted in a significant reduction in the circulating CRP, IL1β and TNFα, with a trend towards lower IL6 compared with placebo
  • parenteral testosterone undecanoate, CRP decreased significantly in hypogonadal elderly men
  • Higher levels of serum adiponectin have been shown to lower cardiovascular risk
  • Research suggests that the expression of VCAM-1, as induced by pro-inflammatory cytokines such as TNFα or interferon γ (IFNγ (IFNG)) in endothelial cells, can be attenuated by treatment with testosterone
  • Testosterone also inhibits the production of pro-inflammatory cytokines such as IL6, IL1β and TNFα in a range of cell types including human endothelial cells
  • decreased inflammatory response to TNFα and lipopolysaccharide (LPS) in human endothelial cells when treated with DHT
  • The key to unravelling the link between testosterone and its role in atherosclerosis may lay in the understanding of testosterone signalling and the cross-talk between receptors and intracellular events that result in pro- and/or anti-inflammatory actions in athero-sensitive cells.
  • testosterone functions through the AR to modulate adhesion molecule expression
  • pre-treatment with DHT reduced the cytokine-stimulated inflammatory response
  • DHT inhibited NFκB activation
  • DHT could inhibit an LPS-induced upregulation of MCP1
  • Both NFκB and AR act at the transcriptional level and have been experimentally found to be antagonistic to each other
  • As the AR and NFκB are mutual antagonists, their interaction and influence on functions can be bidirectional, with inflammatory agents that activate NFκB interfering with normal androgen signalling as well as the AR interrupting NFκB inflammatory transcription
  • prolonged exposure of vascular cells to the inflammatory activation of NFκB associated with atherosclerosis may reduce or alter any potentially protective effects of testosterone
  • DHT and IFNγ also modulate each other's signalling through interaction at the transcriptional level, suggesting that androgens down-regulate IFN-induced genes
  • (Simoncini et al. 2000a,b). Norata et al. (2010) suggest that part of the testosterone-mediated atheroprotective effects could depend on ER activation mediated by the testosterone/DHT 3β-derivative, 3β-Adiol
  • TNFα-induced induction of ICAM-1, VCAM-1 and E-selectin as well as MCP1 and IL6 was significantly reduced by a pre-incubation with 3β-Adiol in HUVECs
  • 3β-Adiol also reduced LPS-induced gene expression of IL6, TNFα, cyclooxygenase 2 (COX2 (PTGS2)), CD40, CX3CR1, plasminogen activator inhibitor-1, MMP9, resistin, pentraxin-3 and MCP1 in the monocytic cell line U937 (Norata et al. 2010)
  • This study suggests that testosterone metabolites, other than those generated through aromatisation, could exert anti-inflammatory effects that are mediated by ER activation.
  • The authors suggest that DHT differentially effects COX2 levels under physiological and pathophysiological conditions in human coronary artery smooth muscle cells and via AR-dependent and -independent mechanisms influenced by the physiological state of the cell
  • There are, however, a number of systematic meta-analyses of clinical trials of TRT that have not demonstrated an increased risk of adverse cardiovascular events or mortality
  • The TOM trial, which was designed to investigate the effect of TRT on frailty in elderly men, was terminated prematurely as a result of an increased incidence of cardiovascular-related events after 6 months in the treatment arm
  • trials of TRT in men with either chronic stable angina or chronic cardiac failure have also found no increase in either cardiovascular events or mortality in studies up to 12 months
  • Evidence may therefore suggest that low testosterone levels and testosterone levels above the normal range have an adverse effect on CVD, whereas testosterone levels titrated to within the mid- to upper-normal range have at least a neutral effect or, taking into account the knowledge of the beneficial effects of testosterone on a series of cardiovascular risk factors, there may possibly be a cardioprotective action
  • The effect of testosterone on human vascular function is a complex issue and may be dependent upon the underlying androgen and/or disease status.
  • the majority of studies suggest that testosterone may display both acute and chronic vasodilatory effects upon various vascular beds at both physiological and supraphysiological concentrations and via endothelium-dependent and -independent mechanisms
  • Nathan Goodyear on 13 May 13
     
    Good deep look into the testosterone and CVD link.
wheelchairindia9

Transport Chair - 0 views

disabilityproduct.in/...TRAVEL-WHEELCHAIR

Transport Wheelchairs For Active Wheelchair Users lightweight aluminium wheelchairs height adjustable frame vertical position of the rear wheel provide a smooth and true roll maximum weight capacity have swing-away leg rests

shared by wheelchairindia9 on 06 Aug 15 - No Cached
  • wheelchairindia9 on 06 Aug 15
     
    Lightweight wheelchairs provide convenience and comfort to the user and caregiver alike and are often built using materials like aluminum and titanium alloy, while foldable wheelchairs allow for easy storage and transport. Merge the two styles, and got a great mobility aid that isn't a pain to lug around. Utilizing small wheels and lighter materials, transport wheelchairs can tip the scale at as little as 19 lbs, ideal for those looking for a highly portable option. Transport chairs also tend to be more affordable and offer the benefit of increased mobility without breaking the bank. Transport wheelchairs or companion chairs are companion wheelchairs where the purpose is for a companion to push the user. Most transporters have swing-away leg rests, fixed armrests, and side panels. Instead of the usual large back - small front wheels typical of most wheelchairs, light travel chairs have four small wheels providing much easier maneuverability of the chair. Karma KM 2500 Small Wheel Wheelchair: Karma KM 2500 Small Wheel Wheelchair Specifications: Width 18" Front/Rear Wheels 6" to 14" Seat Width 47cm Seat Depth 40cm Overall Width 66cm Overall Collapsed Width 36cm Armrest Height 21cm Overall Length 90cm Seat Height 47cm Backrest Height 38cm Overall Height 86cm Weight 9.2 k.g. Karma KM 2500 Small Wheel Wheelchair Seat and Back: AEGIS Microbe Shield Approved by the FDA, EPA, EU, etc., bonded anti-microbial barrier upholstery protects from odor, staining and deterioration from bacteria, fungus and other microorganisms. It is a shield for your health. Karma KM 2500 Small Wheel Wheelchair Extended Armrest: By simulating the natural position of arms, the extended armrest design is ergonomic and creates bigger seating space. An Ultra lightweight wheelchair (9.2 kg) with a compact design for either attendant assisted or self propelling users. The use of aircraft-grade aluminium alloy and double cross brace provide this model
wheelchairindia9

Portable Wheelchair Provides Stage AccessibilityPortable chair frames can be constructe... - 0 views

onlywheelchair.blogspot.in/...wheelchair-provides-stage.html

Portable Wheelchair Provides Stage Accessibility Portable Wheelchair Lightweight Folding Wheelchair Karma KM 2500 Ultra Lightweight Wheelchair Lightweight Wheelchair transport wheelchair

shared by wheelchairindia9 on 19 Dec 15 - No Cached
  • wheelchairindia9 on 19 Dec 15
     
    Portable chair frames can be constructed of either steel or aluminum and have weights anywhere from 15 lbs. and 45 lbs. depending on the model. All chairs will fold from side to side and some have folding back the make transporting and storage easier. Most chairs have weight capacity of 250 lbs. But the heavy duty models will hold up to about 450 lbs. Of course, a chair which will hold 450 lbs. Will be a much more heavily constructed and will push the weight towards the 45 lb. weight. The most common wheel configuration for portable chairs is four 8\" casters with solid tires. The front two casters will swivel to enable turning. On some models the rear two wheels may be 12\" in diameter instead of 8\" and have air tires insted of solid tires. The larger wheels will give a little bit softer ride and traverse rough terrain a little better. They fold up in interesting ways to collapse to the size of a suitcase when not in use and are usually large enough to cover one or two stairs when extended. It is important to consider their weight and the person who would most often be carrying the ramp and setting it up. Karma KM 2500 L Big Wheel Wheelchair Karma KM 2500 L Wheelchair Specifications Width 18" Front/Rear Wheels 6" to 22" Seat Width 47cm Seat Depth 40cm Overall Width 66cm Overall Collapsed Width 36cm Armrest Height 21cm Overall Length 90cm Seat Height 47cm Backrest Height 38cm Overall Height 86cm Weight 11.kg Karma KM 2500 L Wheelchair Seat and Back AEGIS Microbe Shield Approved by the FDA, EPA, EU, etc., bonded anti-microbial barrier upholstery protects from odor, staining and deterioration from bacteria, fungus and other microorganisms. It is a shield for your health. Karma KM 2500 L Wheelchair Extended Armrest By simulating the natural position of arms, the extended armrest design is ergonomic and creates bigger seating space. An Ultra lightweight wheelchair (11 kg) with a compact design for either attendant assisted or
Nathan Goodyear

NETosis and Neutrophil Extracellular Traps in COVID-19: Immunothrombosis and Beyond - PMC - 0 views

www.ncbi.nlm.nih.gov/...PMC8924116

cancer NETosis SARS-CoV-2 COVID COVID-19 COVID19 platelets

shared by Nathan Goodyear on 18 Apr 23 - No Cached
  • Pneumonia is a typical symptom of COVID-19 infection, while acute respiratory distress syndrome (ARDS) and multiple organ failure are common in severe COVID-19 patients
  • NETs are important for preventing pathogen invasion, their excessive formation can result in a slew of negative consequences, such as autoimmune inflammation and tissue damage
  • SARS-CoV-2 infection has also been linked to increased neutrophil-to-lymphocyte ratios, which is associated with disease severity and clinical prognosis
  • ...40 more annotations...
  • NETosis is a special form of programmed cell death in neutrophils, which is characterized by the extrusion of DNA, histones, and antimicrobial proteins in a web-like structure known as neutrophil extracellular traps (NETs)
    • Nathan Goodyear
      Nathan Goodyear on 23 Apr 23
       
      Definition
  • increased generation of reactive oxygen species (ROS) is a crucial intracellular process that causes NETosis
  • Another indirect route of SARS-CoV-2-induced NET production is platelet activation
  • When NETs are activated in the circulation, they can also induce hypercoagulability and thrombosis
  • In COVID-19, major NET protein cargos of NETs (i.e., NE, MPO, and histones) are significantly elevated.
  • SARS-CoV-2 can also infect host cells through noncanonical receptors such as C-type lectin receptors
  • Immunopathological manifestations, including cytokine storms and impaired adaptive immunity, are the primary drivers behind COVID-19, with neutrophil infiltration being suggested as a significant cause
  • NETosis and NETs are increasingly recognized as causes of vascular injury
  • SARS-CoV-2 and its components (e.g., spike proteins and viral RNA) attach to platelets and increase their activation and aggregation in COVID-19, resulting in vascular injury and thrombosis, both of which are linked to NET formation
    • Nathan Goodyear
      Nathan Goodyear on 23 Apr 23
       
      Connects SARS-CoV-2 to TLR on Platelets to NETosis to metastasis.
  • NET formation may be caused by activated platelets rather than SARS-CoV-2 itself
  • NETosis, leading to aberrant immunity such as cytokine storms, autoimmune disorders, and immunosuppression.
  • early bacterial coinfections were more prevalent in COVID-19 patients than those infected with other viruses
  • NETosis and NETs may also have a role in the development of post COVID-19 syndromes, including lung fibrosis, neurological disorders, tumor growth, and worsening of concomitant disease
    • Nathan Goodyear
      Nathan Goodyear on 23 Apr 23
       
      NETosis-> tumor growth
  • NETs and other by-products of NETosis have been shown to act as direct inflammation amplifiers. Hyperinflammation
  • “cytokine storm”
  • SARS-CoV-2 drives NETosis and NET formation to allow for the release of free DNA and by-products (e.g., elastases and histones). This may trigger surrounding macrophages and endothelial cells to secrete excessive proinflammatory cytokines and chemokines, which, in turn, enhance NET formation and form a positive feedback of cytokine storms in COVID-19
    • Nathan Goodyear
      Nathan Goodyear on 23 Apr 23
       
      Cycle of hyperinflammation
  • NET release enables self-antigen exposure and autoantibody production, thereby increasing the autoinflammatory response
  • patients with COVID-19 who have higher anti-NET antibodies are more likely to be detected with positive autoantibodies [e.g., antinuclear antibodies (ANA) and anti-neutrophil cytoplasmic antibodies (ANCA)]
  • COVID-19 NETs may act as potential inducers for autoimmune responses
  • have weakened adaptive immunity as well as a high level of inflammation
    • Nathan Goodyear
      Nathan Goodyear on 23 Apr 23
       
      Immunomodulation
  • tumor-associated NETosis and NETs promote an immunosuppressive environment in which anti-tumor immunity is compromised
  • NETs have also been shown to enhance macrophage pyroptosis in sepsis
  • facilitating an immunosuppressive microenvironment
  • persistent immunosuppression may result in bacterial co-infection or secondary infection
  • can enhance this process by interacting with neutrophils through toll-like receptor 4 (TLR4), platelet factor 4 (PF4), and extracellular vesicle-dependent processes
  • NET-induced immunosuppression in COVID-19 in the context of co-existing bacterial infection
  • Following initial onset of COVID-19, an estimated 50% or more of COVID-19 survivors may develop multi-organ problems (e.g., pulmonary dysfunction and neurologic impairment) or have worsening concomitant chronic illness
  • NETs in the bronchoalveolar lavage fluid of severe COVID-19 patients cause EMT in lung epithelial cells
  • decreased E-cadherin (an epithelial marker) expression
    • Nathan Goodyear
      Nathan Goodyear on 23 Apr 23
       
      Leads to emt
  • COVID-19 also has a long-term influence on tumor progression
  • Patients with tumors have been shown to be more vulnerable to SARS-CoV-2 infection and subsequent development of severe COVID-19
  • patients who have recovered from COVID-19 may have an increased risk of developing cancer or of cancer progression and metastasis
  • awaken cancer cells
  • NETs have been shown to change the tumor microenvironment
  • enhance tumor progression and metastasis
  • vitamin C has been tested in phase 2 clinical trials aimed at reducing COVID-19-associated mortality by reducing excessive activation of the inflammatory response
  • vitamin C is an antioxidant that significantly attenuates PMA-induced NETosis in healthy neutrophils by scavenging ROS
  • vitamin C may also inhibit NETosis and NET production in COVID-19
  • Metformin
  • Vitamin C
  • Nathan Goodyear on 18 Apr 23
     
    NETosis intimately involved in progressive COVID, long COVID, autoimmunity, and cancer
wheelchairindia9

Tricycle Manufacturers - 0 views

www.wheelchairindia.com/...TRICYCLE

Comfortable Ergonomics For Wheelchair Users lightweight frames and seats Tricycle Manufacturers increase strength and coordination durability and safety Karman Ergonomic Wheelchair upper body strength

shared by wheelchairindia9 on 13 May 15 - No Cached
  • wheelchairindia9 on 13 May 15
     
    Tricycles make cycling accessible to all, whatever personal challenges. There are a wide range of disability cycles that suit people with a variety of learning and physical disabilities, as well as health issues. Tricycles have 3 wheels, which means that the rider does not need to be able to balance. This is particularly useful for people with learning disabilities, such as Dyspraxia, and those recovering from illnesses. Tricycles can be fitted with foot plates to make it easier for riders to rotate the pedals and they come in upright or recumbent (horizontal sitting position). For adults and children with balance issues, stabilisers can also be fitted to standard bikes, which makes them more like tricycles. Tricycles come in a variety of accessible styles for people of all abilities including many persons with spinal cord injury disabilities. Tricycles is a great upper body workout and can provide a great sense of freedom for persons with disabilities. While the high cost prevents many from enjoying Tricycles they are steadily growing in popularity. Tricycle Deluxe Double Hand Drive: Frame : Made by E.R.W. Tubes 38.0 mm-16 G. 25.4 mm & 22.22 mm- 18 G. Seat & Back: M S, C.R.C. Sheet. Seat Size 18"x 16" Wheel Size: Wheel Diameter 24"x 1 1/2" Tyre and Tube Standard Company. Parts: Standard Quality. Color: Black Painted. Brake: Front Wheel liver System Drive: Rear Wheel Right Side. Hand powered cycles work along the same principle as standard cycles. The pedals are replaced with handles that also steer, and riders use their arms to push the handles around to drive the chain and wheels. Most hand cycles have 3 wheels, although some have 4 wheels. 4-wheel cycles may have power assistance instead of the rider turning handles,or they may be built for going down hill, in which case gravity powers the bike. As with tricycles, hand cycles can have upright seats or low down recumbent seats. Specialist 'clip on' cycles are also available that can be attached
wheelchairindia9

Wheelchair 4 Wheel Drive - 0 views

www.wheelchairindia.com/...Wheelchair-With-4-Small-Wheels

Wheelchair Wheels Are Detachable And Foldable electric propulsion by motors safe operation Wheelchairs weigh maximum fixed or detachable armrests rear wheels by hand strong and durable frame low resistant Nylon

shared by wheelchairindia9 on 22 May 15 - No Cached
  • wheelchairindia9 on 22 May 15
     
    A wheelchair is a wheeled mobility device in which the user sits. The device is propelled either manually (by turning the wheels by the hand) or via various automated systems. Wheelchairs are used by people for whom walking is difficult or impossible due to illness (physiological or physical), injury, or disability. The chair seat size (width and depth), seat-to-floor height, footrests/leg rests, front caster outriggers, adjustable backrests, controls, and many other features can be customized on, or added to, many basic models, while some users, often those with specialised needs, may have wheelchairs custom-built. The usual size of the rear wheel ranges from twenty to twenty-six inches in diameter. A larger wheel increases the height of the seat off the ground and decreases the rolling resistance, thus easing the effort of pushing. The rear wheels can be solid or pneumatic. Solid wheels have a low rolling resistance and are very easy to maintain. They are ideal for use in institutional settings or for indoor use in noncarpeted areas. Pneumatic wheels have better grip on carpeted surfaces and are better if there is going to be significant outdoor use, but they run the risk of flats and require higher maintenance. The flat tire problem can be circumvented by the use of a foam insert that can prevent leaks. Wire spokes are lighter in weight but higher in maintenance. Most older persons will select large plastic spokes referred to as mag wheels. The wheels can be offset posteriorly to decrease the risk of tipping backwards. Wheelchair With 4 Small Wheels: Wheelchair With 4 Small Wheels foldable frame wheelchair made of chrome with 18" inches seat width, 8" Inches Front and Rear wheel, total weight 14 kg helps physical challenged person to move around indoor. Wheelchair With 4 Small Wheels Measurements: Seat Width : 16 inch., 18 inch. Frame Style : Foldable Frame Material : M.S. Chrome open position wheel to wheel width in : 22" (inches) Seat Width : 1
wheelchairindia9

Cp Child Wheelchair - 0 views

www.wheelchairindia.com/...CP-Wheelchair

Wheelchair Offers New Vistas For Persons With Cerebral Palsy cerebellum and the cortex common causes of brain damage cause like chicken pox or measles neurological problems are properly managed

shared by wheelchairindia9 on 05 May 15 - No Cached
  • wheelchairindia9 on 05 May 15
     
    young children have a different set of needs than adults. Aesthetically, devices designed for kids are often sleek and colorful, and functionally, they are typically lightweight and adjustable. As any parent knows, young people don't stay the same size for long and since a wheelchair is a major purchase -- don't want a simple growth spurt to render it useless. Wheelchair category offers models that feature seat width and depth adjustability, elevating legrests, and other versatile features. As a weight-bearing activity is critical to proper physical and mental function-which is why children with cerebral palsy, who may sit for stretches in a wheelchair and typically are unable to stand on their own, can benefit greatly from pediatric standers as part of a comprehensive pediatric rehabilitation program. Pediatric standers are offered in passive, active and mobile formats: Passive standers stay in one place and feature a support surface, active standers allow reciprocal movement of the extremities while in a standing position, and mobile standers enable users to self-propel. Cerebral Palsy Wheelchair: Cerebral Palsy Wheelchair Description: The model designed for cerebral palsy child only. Ultra light weight aluminium alloy frame. Seat Width 38 cms (15"). Net Weight: 18.5 kgs. Epoxy powder coated frame. Detachable arm rest & foot rest provided. Elevated and swinging foot rest. Elevated foot rest provided to elevate leg angle. Height adjustable and detachable head rest. Hydraulic reclining high back for a comfortable posture. Hydraulic adjustable seat angle. Detachable back and seat pad. Extra cushion upholstery provided to under arm, head & calg Foldable. Lever and paddle brakes provided. Safety belt provided. Maintenance free rear solid wheels. Cloth look like water proof upholstery. Anti wheels for better safety and stability. Extra cushion upholstery provided to under arm, head & leg. Folding action. Lever and paddle brakes provide
wheelchairindia9

Chair For Cerebral Palsy Child - 0 views

www.wheelchairindia.com/...Cerebral-Palsy-Wheelchair

cerebellum and the cortex common causes of brain damage cause like chicken pox or measles neurological problems are properly managed

shared by wheelchairindia9 on 12 May 15 - No Cached
  • wheelchairindia9 on 12 May 15
     
    Cerebral palsy (CP) is a group of conditions caused by medical abnormalities in the development of a fetus or the early life of a child. These lead to damage or delayed development in the brain. The disorder is permanent and, though it does not worsen with age, the level of functionality of a person with cerebral palsy varies widely: in some cases, effects may be very minor, while in others, movement is impaired to the extent that a wheelchair is required. Common complications associated with CP vary by the type of CP disorder but can include vision problems, seizures, learning disabilities, and issues speaking, writing, and performing other tasks. Cerebral palsy causes problems with muscle tone, movement, balance and/or coordination. Symptoms and effects range from mild to severe. In some infants, problems are evident soon after birth. In others, diagnosis comes in later infancy or toddlerhood. Cerebral Palsy Wheelchair Description: The model designed for cerebral palsy child only. Ultra light weight aluminium alloy frame. Seat Width 38 cms (15"). Net Weight: 18.5 kgs. Epoxy powder coated frame. Detachable arm rest & foot rest provided. Elevated and swinging foot rest. Elevated foot rest provided to elevate leg angle. Height adjustable and detachable head rest. Hydraulic reclining high back for a comfortable posture. Hydraulic adjustable seat angle. Detachable back and seat pad. Extra cushion upholstery provided to under arm, head & calg Foldable. Lever and paddle brakes provided. Safety belt provided. Maintenance free rear solid wheels. Cloth look like water proof upholstery. Anti wheels for better safety and stability. Extra cushion upholstery provided to under arm, head & leg Folding action. Lever and paddle brakes provided. Safety belt provided. Maintenance free rear solid wheels. Cerebral Palsy Wheelchair Recline system: Recline system provides kids with the most comfortable resting environment. It also allows stretching abdomin
wheelchairindia9

Transport Chairs - 0 views

www.wheelchairindia.com/...TRAVEL-WHEELCHAIR

Transportation Wheelchair For Problems of People with Disabilities best transport wheelchairs benefits that transport wheelchairs Transport wheelchairs are machines Transport Wheelchairs Are Less Bulky

shared by wheelchairindia9 on 21 May 15 - No Cached
  • wheelchairindia9 on 21 May 15
     
    Lightweight wheelchairs provide convenience and comfort to the user and caregiver alike and are often built using materials like aluminum and titanium alloy, while foldable wheelchairs allow for easy storage and transport. Merge the two styles, and got a great mobility aid that isn't a pain to lug around. Utilizing small wheels and lighter materials, transport wheelchairs can tip the scale at as little as 19 lbs, ideal for those looking for a highly portable option. Transport chairs also tend to be more affordable and offer the benefit of increased mobility without breaking the bank. This type of lightweight wheelchair is often referred to as a "transfer chair" and is typically used for shorter trips. Since it's geared towards storability and portability, it features four smaller wheels and dispenses with the larger, rear-mounted wheels that characterize standard wheelchairs. Its construction ensures that it's always foldable and portable, but does so at the expense of self-propulsion. Instead, a transport chair is built so that a caregiver can easily push the user. Transport wheelchairs or companion chairs are companion wheelchairs where the purpose is for a companion to push the user. Most transporters have swing-away leg rests, fixed armrests, and side panels. Instead of the usual 'large back - small front' wheels typical of most wheelchairs, light travel chairs have four small wheels providing much easier maneuverability of the chair. Karma Travel Wheelchair KM TV 20.2: Karma Travel Wheelchair KM TV 20.2 - 606 T-6 aircraft-grade aluminum-alloy frame provides incredible strength. Easy-to-fold in three seconds. Karma Travel Wheelchair KM TV 20.2 Features: Type: Travel Wheelchair. T-6 aircraft-grade aluminum. Secure brake improve safety. Padded flip back armrest. PU front caster & rear wheel. Karma Travel Wheelchair KM TV 20.2 Measurements: Weight: 8.9kg. Seat width: 39.5cm. Tyre: PU front casters and rear wheels. Capacity: 100
Nathan Goodyear

Circulating 2-hydroxy and 16-α hydroxy estrone levels and risk of breast canc... - 1 views

www.ncbi.nlm.nih.gov/...PMC2562592

estrogen metabolism menopause post-menopause post menopause estrogen metabolite 2-OH-estrone 16-alpha-OH-estrone 2:16alpha-OH estrone breast cancer risk hormone hormones

shared by Nathan Goodyear on 21 Aug 14 - No Cached
  • 2-OH estrogens bind to the estrogen receptor (ER) with affinity equivalent to or greater than estradiol
  • previous prospective studies have not observed any significant associations with either 2-OH or 16α-OH estrone or the ratio of the two metabolites and breast cancer risk overall.
    • Nathan Goodyear
      Nathan Goodyear on 08 Oct 15
       
      whether that risk is increased or decreased
  • it has been hypothesized that metabolism favoring the 2-OH over the 16α-OH pathway may be inversely associated with breast cancer risk (28).
  • ...24 more annotations...
  • they may act as only weak mitogens (14, 15), or as inhibitors of proliferation
  • No significant associations have been observed between 2-OH estrone and breast cancer risk
  • While 16α-OH estrone binds to the ER with lower affinity than estradiol, it binds covalently (18-20) and once bound, fails to down-regulate the receptor (21). Thus, 16α-OH estrone stimulates cell proliferation in a manner comparable to estradiol in ER+ breast cancer cell lines
  • In this large prospective study of 2-OH and 16α-OH estrone metabolites and breast cancer risk, we did not observe any significant associations overall with either individual metabolite or with the ratio of the two metabolites
  • we observed positive associations with 2-OH estrone and the 2:16α-OH estrone ratio among women with lower BMI and women with ER-/PR-tumors,
  • To date, several epidemiologic studies have examined the association between the 2-OH and 16α-OH estrogen metabolites and breast cancer risk with inconclusive results.
  • circulating estrogen levels have been associated more strongly with ER+/PR+ tumors than with ER-/PR- tumors
  • our results do not support the hypothesis that metabolism favoring the 2-OH estrone pathway is more beneficial to breast cancer risk than that favoring the 16α-OH estrone pathway
  • we observed significant positive associations of both 2-OH estrone and the 2:16α-OH estrone ratio with ER-/PR-tumors
  • Three (30, 32, 33) of four (30-33) studies observed RRs above 1 for the association between 16α-OH estrone and breast cancer risk (range of RRs=1.23-2.47); none of the point estimates was statistically significant though one trend was suggestive
  • based on animal studies, 2-OH estrone and the 2:16α-OH estrone ratio have been hypothesized to be inversely associated with breast cancer risk
  • No significant associations have been observed between 2-OH estrone, 16α-OH estrone, or the 2:16α-OH estrone ratio and breast cancer risk and the direction of the estimates is not consistent across studies.
    • Nathan Goodyear
      Nathan Goodyear on 08 Oct 15
       
      better worded is no consistent, significant associations.   There are some studies that point to the 16 catecholestrogen and increased cancer risk; limited studies show negative effects of 2 catecholestrogens on cancer risk and prospective studies available pretty much dispel the idea that the 2:16 ratio has an risk predictability.
  • we observed a suggestive inverse association with 16α-OH estrone and a significant positive association with the 2:16α-OH estrone ratio among lean women, suggesting possible associations in a low estrogen environment.
  • 16α-OH estrone increases unscheduled DNA synthesis in mouse mammary cells (27) and hence also may be genotoxic
  • Although 2-OH estrogens are capable of redox cycling, the semiquinones and quinones (i.e., the oxidized forms) form stable DNA adducts that are reversible without DNA destruction
  • In our population of PMH nonusers, we observed no associations with ER+/PR+ tumors, but significant positive associations with 2-OH estrone and the 2:16α-OH estrone ratio among women with ER-/PR- tumors
    • Nathan Goodyear
      Nathan Goodyear on 08 Oct 15
       
      one of the few studies to find this association between 2 catecholestrogens and the 2:16 ratio and ER-/PR-tumors
  • Animal and in vitro studies have shown that hydroxy estrogens can induce DNA damage either directly, through the formation of quinones and DNA adducts, or indirectly, through redox cycling and the generation of reactive oxygen species
    • Nathan Goodyear
      Nathan Goodyear on 08 Oct 15
       
      genotoxic via directe DNA adducts and indirectly via ROS; this is in addition to the proliferative effect
  • we observed a significant positive association between the 2:16α-OH estrone ratio and breast cancer risk among lean women
  • No significant associations have been observed with the 2:16α-OH estrone ratio
  • In the Danish study, no associations were observed with either ER+ or ER- tumors among PMH nonusers
  • significant positive associations with 2-OH estrone and the 2:16α-OH estrone ratio were observed among PMH users with ER+, but not ER-, tumors
  • it is possible that the genotoxicity of 2-OH estrone plays a role in hormone receptor negative tumors
  • 4-OH estrogens have a greater estrogenic potential than 2-OH estrogens, given the lower dissociation rate from estrogen receptors compared with estradiol (61), and are potentially more genotoxic since the quinones form unstable adducts, leading to depurination and mutation in vitro and in vivo
  • the balance between the catechol (i.e., 2-OH and 4-OH) and methoxy (i.e., 2-Me and 4-Me) estrogens may impact risk
  • Nathan Goodyear on 21 Aug 14
     
    The risks of estrogen metabolism are not clear cut.  Likely never will be due to the complexity of individual metabolism.  This study found no correlation between 2OH-Estrone and 2OH:16alpha-Estrone and breast cancer risk in ER+/PR+ breast cancer.  Translated: no benefit in breast cancer risk in 2OH-Estrone metabolism or increased 2OH:16alpha estrone metabolism.  There was a positive association between 2OH-Estrone and 2:16alpha-Estrone in women with ER-/PR- tumors and low BMI.
  • anonymous on 28 Oct 15
     
    pakistani sexy girls escort in dubai // russian sexy girsl escort in dubai // sexy girls in dubai // sexy girls escort in dubai //
Nathan Goodyear

ScienceDirect.com - The Journal of Steroid Biochemistry and Molecular Biology - Progest... - 0 views

www.sciencedirect.com/...S0960076009001216

progesterone progestins breast cancer receptors PR

shared by Nathan Goodyear on 15 May 12 - No Cached
  • Nathan Goodyear on 15 May 12
     
    this study states that progesterone promotes breast growth and has implications of breast cancer.  However, this study looked at progestins not progesterone.  Studies have shown a reduction of breast cancer risk with progesterone and an increase with progestins.  It would have been nice to have looked at "progesterone" metabolites.  This study shows the flaw that many have: the intermix progesterone and progestins as if they are one in the same and they are clearly not
Nathan Goodyear

Testosterone and glucose metabolism in men: current concepts and controversies - 0 views

joe.endocrinology-journals.org/...R37.full

Low T Testosterone metabolic syndrome MetS Diabetes men male glucose hormone hormones g

shared by Nathan Goodyear on 04 Feb 14 - No Cached
  • Around 50% of ageing, obese men presenting to the diabetes clinic have lowered testosterone levels relative to reference ranges based on healthy young men
  • The absence of high-level evidence in this area is illustrated by the Endocrine Society testosterone therapy in men with androgen deficiency clinical practice guidelines (Bhasin et al. 2010), which are appropriate for, but not specific to men with metabolic disorders. All 32 recommendations made in these guidelines are based on either very low or low quality evidence.
  • A key concept relates to making a distinction between replacement and pharmacological testosterone therapy
  • ...59 more annotations...
  • The presence of symptoms was more closely linked to increasing age than to testosterone levels
  • Findings similar to type 2 diabetes were reported for men with the metabolic syndrome, which were associated with reductions in total testosterone of −2.2 nmol/l (95% CI −2.41 to 1.94) and in free testosterone
  • low testosterone is more predictive of the metabolic syndrome in lean men
  • Cross-sectional studies uniformly show that 30–50% of men with type 2 diabetes have lowered circulating testosterone levels, relative to references based on healthy young men
  • In a recent cross-sectional study of 240 middle-aged men (mean age 54 years) with either type 2 diabetes, type 1 diabetes or without diabetes (Ng Tang Fui et al. 2013b), increasing BMI and age were dominant drivers of low total and free testosterone respectively.
  • both diabetes and the metabolic syndrome are associated with a modest reduction in testosterone, in magnitude comparable with the effect of 10 years of ageing
  • In a cross-sectional study of 490 men with type 2 diabetes, there was a strong independent association of low testosterone with anaemia
  • In men, low testosterone is a marker of poor health, and may improve our ability to predict risk
    • Nathan Goodyear
      Nathan Goodyear on 04 Feb 14
       
      probably the most important point made in this article
  • low testosterone identifies men with an adverse metabolic phenotype
  • Diabetic men with low testosterone are significantly more likely to be obese or insulin resistant
  • increased inflammation, evidenced by higher CRP levels
  • Bioavailable but not free testosterone was independently predictive of mortality
  • It remains possible that low testosterone is a consequence of insulin resistance, or simply a biomarker, co-existing because of in-common risk factors.
  • In prospective studies, reviewed in detail elsewhere (Grossmann et al. 2010) the inverse association of low testosterone with metabolic syndrome or diabetes is less consistent for free testosterone compared with total testosterone
  • In a study from the Framingham cohort, SHBG but not testosterone was prospectively and independently associated with incident metabolic syndrome
  • low SHBG (Ding et al. 2009) but not testosterone (Haring et al. 2013) with an increased risk of future diabetes
  • In cross-sectional studies of men with (Grossmann et al. 2008) and without (Bonnet et al. 2013) diabetes, SHBG but not testosterone was inversely associated with worse glycaemic control
  • SHBG may have biological actions beyond serving as a carrier protein for and regulator of circulating sex steroids
  • In men with diabetes, free testosterone, if measured by gold standard equilibrium dialysis (Dhindsa et al. 2004), is reduced
    • Nathan Goodyear
      Nathan Goodyear on 04 Feb 14
       
      expensive, laborious process filled with variables
  • Low free testosterone remains inversely associated with insulin resistance, independent of SHBG (Grossmann et al. 2008). This suggests that the low testosterone–dysglycaemia association is not solely a consequence of low SHBG.
  • Experimental evidence reviewed below suggests that visceral adipose tissue is an important intermediate (rather than a confounder) in the inverse association of testosterone with insulin resistance and metabolic disorders.
  • testosterone promotes the commitment of pluripotent stem cells into the myogenic lineage and inhibits their differentiation into adipocytes
  • testosterone regulates the metabolic functions of mature adipocytes (Xu et al. 1991, Marin et al. 1995) and myocytes (Pitteloud et al. 2005) in ways that reduce insulin resistance.
  • Pre-clinical evidence (reviewed in Rao et al. (2013)) suggests that at the cellular level, testosterone may improve glucose metabolism by modulating the expression of the glucose-transported Glut4 and the insulin receptor, as well as by regulating key enzymes involved in glycolysis.
  • More recently testosterone has been shown to protect murine pancreatic β cells against glucotoxicity-induced apoptosis
  • Interestingly, a reciprocal feedback also appears to exist, given that not only chronic (Cameron et al. 1990, Allan 2013) but also, as shown more recently (Iranmanesh et al. 2012, Caronia et al. 2013), acute hyperglycaemia can lower testosterone levels.
  • There is also evidence that testosterone regulates insulin sensitivity directly and acutely
  • In men with prostate cancer commencing androgen deprivation therapy, both total as well as, although not in all studies (Smith 2004), visceral fat mass increases (Hamilton et al. 2011) within 3 months
  • More prolonged (>12 months) androgen deprivation therapy has been associated with increased risk of diabetes in several large observational registry studies
  • Testosterone has also been shown to reduce the concentration of pro-inflammatory cytokines in some, but not all studies, reviewed recently in Kelly & Jones (2013). It is not know whether this effect is independent of testosterone-induced changes in body composition.
  • the observations discussed in this section suggest that it is the decrease in testosterone that causes insulin resistance and diabetes. One important caveat remains: the strongest evidence that low testosterone is the cause rather than consequence of insulin resistance comes from men with prostate cancer (Grossmann & Zajac 2011a) or biochemical castration, and from mice lacking the androgen receptor.
  • Several large prospective studies have shown that weight gain or development of type 2 diabetes is major drivers of the age-related decline in testosterone levels
  • there is increasing evidence that healthy ageing by itself is generally not associated with marked reductions in testosterone
  • Circulating testosterone, on an average 30%, is lower in obese compared with lean men
  • increased visceral fat is an important component in the association of low testosterone and insulin resistance
  • The vast majority of men with metabolic disorders have functional gonadal axis suppression with modest reductions in testosterone levels
  • obesity is a dominant risk factor
  • men with Klinefelter syndrome have an increased risk of metabolic disorders. Interestingly, greater body fat mass is already present before puberty
  • Only 5% of men with type 2 diabetes have elevated LH levels
  • inhibition of the gonadal axis predominantly takes place in the hypothalamus, especially with more severe obesity
  • Metabolic factors, such as leptin, insulin (via deficiency or resistance) and ghrelin are believed to act at the ventromedial and arcuate nuclei of the hypothalamus to inhibit gonadotropin-releasing hormone (GNRH) secretion from GNRH neurons situated in the preoptic area
  • kisspeptin has emerged as one of the most potent secretagogues of GNRH release
  • hypothesis that obesity-mediated inhibition of kisspeptin signalling contributes to the suppression of the HPT axis, infusion of a bioactive kisspeptin fragment has been recently shown to robustly increase LH pulsatility, LH levels and circulating testosterone in hypotestosteronaemic men with type 2 diabetes
  • A smaller study with a similar experimental design found that acute testosterone withdrawal reduced insulin sensitivity independent of body weight, whereas oestradiol withdrawal had no effects
  • suppression of the diabesity-associated HPT axis is functional, and may hence be reversible
  • Obesity and dysglycaemia and associated comorbidities such as obstructive sleep apnoea (Hoyos et al. 2012b) are important contributors to the suppression of the HPT axis
  • weight gain and development of diabetes accelerate the age-related decline in testosterone
  • Modifiable risk factors such as obesity and co-morbidities are more strongly associated with a decline in circulating testosterone levels than age alone
  • 55% of symptomatic androgen deficiency reverted to a normal testosterone or an asymptomatic state after 8-year follow-up, suggesting that androgen deficiency is not a stable state
  • Weight loss can reactivate the hypothalamic–pituitary–testicular axis
  • Leptin treatment resolves hypogonadism in leptin-deficient men
  • The hypothalamic–pituitary–testicular axis remains responsive to treatment with aromatase inhibitors or selective oestrogen receptor modulators in obese men
  • Kisspeptin treatment increases LH secretion, pulse frequency and circulating testosterone levels in hypotestosteronaemic men with type 2 diabetes
  • change in BMI was associated with the change in testosterone (Corona et al. 2013a,b).
  • weight loss can lead to genuine reactivation of the gonadal axis by reversal of obesity-associated hypothalamic suppression
  • There is pre-clinical and observational evidence that chronic hyperglycaemia can inhibit the HPT axis
  • in men who improved their glycaemic control over time, testosterone levels increased. By contrast, in those men in whom glycaemic control worsened, testosterone decreased
  • testosterone levels should be measured after successful weight loss to identify men with an insufficient rise in their testosterone levels. Such men may have HPT axis pathology unrelated to their obesity, which will require appropriate evaluation and management.
  • Nathan Goodyear on 04 Feb 14
     
    Article discusses the expanding evidence of low T and Metabolic syndrome.
Nathan Goodyear

[Evaluation of relationships between pla... [Pol Merkur Lekarski. 2014] - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...24645572

low T Testosterone andropenia hypogonadism metabolic syndrome men male hormones

shared by Nathan Goodyear on 01 Apr 14 - No Cached
  • Nathan Goodyear on 01 Apr 14
     
    Men with Metabolic Syndrome have lower Total Testosterone values.  Symptoms correlated with age: older men associated with increased symptoms.  This study only found lot T at 6.5%.  The authors in this study have come up with a new box--andropenia.  I don't know what the heck that is and how that helps clients.  If symptoms are present and if levels are on the decline, then symptomatic hypogonadism is present.  I know the logic seems simple, but it appears hard to follow in the science.  I don't see this any different then type II diabetes.  At 126 you have diabetes, but at 125, we don't know what to do with you but see us next year and you will have diabetes and we will know what to do because you are in the box of diabetes.
Nathan Goodyear

Testosterone Deficiency, Cardiac Health, and Older Men - 0 views

www.hindawi.com/...143763

low T Testosterone obesity type II diabetes diabetes health wellness metabolic syndrome lipids cholesterol hypogonadism TDS testicular dysgenesis syndrome men male hormone hormones prostate cancer

shared by Nathan Goodyear on 12 May 14 - No Cached
  • Studies have shown pharmacological doses of testosterone to relax coronary arteries when injected intraluminally [39] and to produce modest but consistent improvement in exercise-induced angina and reverse associated ECG changes [40]. The mechanism of action is via blockade of calcium channels with effect of similar magnitude to nifedipine
    • Nathan Goodyear
      Nathan Goodyear on 12 May 14
       
      This directly refutes the recent studies (3) that Testosterone therapy increases cardiovascular events.
    • Nathan Goodyear
      Nathan Goodyear on 13 May 14
       
      Testosterone acts as a calcium channel blocker inducing vasodilation.
  • men with chronic stable angina pectoris, the ischaemic threshold increased after 4 weeks of TRT and a recent study demonstrates improvement continuing beyond 12 months [
  • Exercise capacity in men with chronic heart failure increased after 12 weeks
  • ...36 more annotations...
  • Studies have shown an inverse relationship between serum testosterone and fasting blood glucose and insulin levels
  • Medications such as chronic analgesics, anticonvulsants, 5ARIs, and androgen ablation therapy are associated with increased risk of testosterone deficiency and insulin resistance
  • Women with T2D or metabolic syndrome characteristically have low SHBG and high free testosterone
    • Nathan Goodyear
      Nathan Goodyear on 12 May 14
       
      This stands in polar opposite of that with men.
  • Hypogonadism is a common feature of the metabolic syndrome
  • The precise interaction between insulin resistance, visceral adiposity, and hypogonadism is, as yet, unclear but the important mechanisms are through increased aromatase production, raised leptin levels, and increase in inflammatory kinins
  • levels of testosterone are reduced in proportion to degree of obesity
  • Men should be encouraged to combine aerobic exercise with strength training. As muscle increases, glucose will be burned more efficiently and insulin levels will fall. A minimum of 30 minutes exercise three times weekly should be advised
  • Testosterone increases levels of fast-twitch muscle fibres
  • By increasing testosterone, levels of type 2 fibres increase and glucose burning improves
  • Weight loss will increase levels of testosterone
  • studies now clearly show that low testosterone leads to visceral obesity and metabolic syndrome and is also a consequence of obesity
  • In the case of MMAS [43], a baseline total testosterone of less than 10.4 nmol/L was associated with a greater than 4-fold incidence of type 2 diabetes over the next 9 years
  • There is high level evidence that TRT improves insulin resistance
  • Low testosterone predicts increased mortality and testosterone therapy improves survival in 587 men with type 2 diabetes
  • A similar retrospective US study involved 1031 men with 372 on TRT. The cumulative mortality was 21% in the untreated group versus 10% ( ) in the treated group with the greatest effect in younger men and those with type 2 diabetes
  • the presence of ED has been shown to be an independent risk factor, particularly in hypogonadal men, increasing the risk of cardiac events by over 50%
  • A recent online publication on ischaemic heart disease mortality in men concluded optimal androgen levels are a biomarker for survival
  • inverse associations between low TT or FT (Table 2) and the severity of CAD
  • A recent 10 year study from Western Australia involving 3690 men followed up from 2001–2010 concluded that TT and FT levels in the normal range were associated with decreased all-cause and cardiovascular mortality, for the first time suggesting that both low and DHT are associated with all-cause mortality and higher levels of DHT reduced cardiovascular risk
  • TDS is associated with increased cardiovascular and all-cause mortality
  • The effect of treatment with TRT reduced the mortality rate of treated cohort (8.4%) to that of the eugonadal group whereas the mortality for the untreated remained high at 19.2%
  • hypogonadal men had slightly increased triglycerides and HDL
  • Men with angiographically proven CAD (coronary artery disease) have significantly lower testosterone levels [29] compared to controls ( ) and there was a significant inverse relationship between the degree of CAD and TT (total testosterone) levels
  • TRT has also been shown to reduce fibrinogen to levels similar to fibrates
  • men treated with long acting testosterone showed highly significant reductions in TC, LDL, and triglycerides with increase in HDL, associated with significant reduction in weight, BMI, and visceral fat
  • Low androgen levels are associated with an increase in inflammatory markers
  • In the Moscow study, C-reactive protein was reduced by TRT at 30 weeks versus placebo
  • In some studies, a decline in diastolic blood pressure has been observed, after 3–9 months [24, 26] and in systolic blood pressure
  • A decline was noted in IL6 and TNF-alpha
  • No studies to date show an increase in LUTS/BPH symptoms with higher serum testosterone levels
  • TRT has been shown to upregulate PDE5 [65] and enhance the effect of PDE5Is (now an accepted therapy for both ED and LUTS), it no longer seems logical to advice avoidance of TRT in men with mild to moderate BPH.
    • Nathan Goodyear
      Nathan Goodyear on 12 May 14
       
      What about just starting with normalization of Testosterone levels first.
  • Several meta-analyses have failed to show a link between TRT and development of prostate cancer [66] but some studies have shown a tendency for more aggressive prostate cancer in men with low testosterone
    • Nathan Goodyear
      Nathan Goodyear on 12 May 14
       
      And if one would have looked at their estrogen levels, I guarantee they would have been found to be elevated.
  • low bioavailable testosterone and high SHBG were associated with a 4.9- and 3.2-fold risk of positive biopsy
  • Current EAU, ISSAM, and BSSM guidance [1, 2] is that there is “no evidence TRT is associated with increased risk of prostate cancer or activation of subclinical cancer.”
  • Men with prostate cancer, treated with androgen deprivation, develop an increase of fat mass with an altered lipid profile
  • Erectile dysfunction is an established marker for future cardiovascular risk and the major presenting symptom leading to a diagnosis of low testosterone
wheelchairindia9

Toilet Wheelchair - 0 views

www.wheelchairindia.com/...COMMODE%20WHEELCHAIR

Folding Commode Wheelchair Can Improve Lives convenient and portable single seat with center removable Pan With Lid And Handle plastic commode seat with pot domestic and hospital purpose indoor toilet purposes

shared by wheelchairindia9 on 04 May 15 - No Cached
  • wheelchairindia9 on 04 May 15
     
    Commode chairs are best suited for people who cannot use a regular toilet. The chairs enable patients who have limited mobility due to an accident or any medical condition to use the toilet with ease. The chair allows the patient to use the toilet without causing discomfort to the legs and back. The chair can be used by people who are restricted to a bed or wheelchair. A commode chair is a useful mobility for people of any age who are recovering from injury or surgery. The chair offers a reasonable level of independence to the user; a handy device to be presented to someone who needs it and for whom care. Commode Wheelchairs which are specially designed for aged and physically challenged people. These wheelchairs can be used for indoor toilet purposes. Fabricated using quality raw material, these wheelchairs are suitable for domestic and hospital purpose. There are two types for handicapped and disability product like Commode Wheelchair- Commode Wheelchair Rainbow 6 Commode Wheelchair Rainbow 7 Commode Wheelchair Rainbow 6: Karma commode wheelchair rainbow 6 comes with lot of exiting features for elderly or physically challenged person who want commode in wheelchair. Karma Rainbow 6 has single seat with center cut commode having cushion cover on top and removable pan or plastic commode seat with pot. Commode Wheelchair Rainbow 6 Features: Frame Material : M.S.Chrome Plated Single Seat with center cut commode Both Option Available In Single Seat Plastic Commode Seat With Pot. Cushioned Top Cover Square Pan Commode Pan Removable Pan Commode Wheelchair Rainbow 6 Measurements: Frame Style : Foldable Open Position Wheel To Wheel Width In : 26" (Inches) Seat Width : 18" (Inches) Total Width in Closing Position : 11" (Inches) Rear Wheel Size : 24" (Inches) Front Wheel Size : 8" (Inches) Seat to Floor Height : 19" (Inches) Seat Depth : 18" (Inches) Total Height : 34" (Inches) Max User Weight Capacity : 110 (kgs)
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