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Nathan Goodyear

Testosterone and weight loss: the evidence - 0 views

www.ncbi.nlm.nih.gov/...PMC4154787

low T low Testosterone Testosterone men male hormone hormones obesity obese fat adipose tissue visceral fat muscle waist circumference BMI

shared by Nathan Goodyear on 04 Mar 15 - No Cached
    • Nathan Goodyear
      Nathan Goodyear on 04 Mar 15
       
      What a ridiculous statement!
  • Testosterone therapy increases LBM, reduces fat mass and produces sustained and significant weight loss, reduction in waist circumference and BMI
Nathan Goodyear

Testosterone Replacement in Hypogonadal Men With Type 2 Diabetes and/or Metabolic Syndr... - 0 views

www.ncbi.nlm.nih.gov/...PMC3064036

low T low Testosterone men male hormone hormones Testosterone diabetes cholesterol insulin resistance insulin sensitivity LDL muscle muscle mass body composition metabolic syndrome

shared by Nathan Goodyear on 05 Mar 15 - No Cached
  • Nathan Goodyear on 05 Mar 15
     
    Testosterone therapy in men with low Testosterone was found to improve insulin sensitivity, total cholesterol levels, LDL, Lpa, and sexual performance in men with low T, type II diabetes and/or metabolic syndrome.  There is suggestion that muscle composition was improved as well.
Nathan Goodyear

Testosterone Deficiency in Young Men: Marked Alterations in Whole Body Protein Kinetics... - 0 views

press.endocrine.org/...jcem.83.6.4892

low T low Testosterone muscle muscle mass strength fat obesity adipose tissue metabolism hormone hormones men male

shared by Nathan Goodyear on 06 Mar 15 - No Cached
  • Nathan Goodyear on 06 Mar 15
     
    low T in men, small study, found to decrease muscle growth, decreased strength as a result, decrease in fat oxidation/breakdown and increase in fat stores.  Low T turns the muscle:fat ratio in men upside down--the result is a metabolic derailment.
Nathan Goodyear

Relationship between low free testosterone levels and loss of muscle mass. - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...23660939

free Testosterone total Testosterone muscle Testosterone sarcopenia muscle loss men male hormone hormones

shared by Nathan Goodyear on 05 Apr 15 - No Cached
  • Nathan Goodyear on 05 Apr 15
     
    low free Testosterone associated with muscle loss in men compared to no association with total Testosterone in Japanese men.
Nathan Goodyear

Effects of Age and Sedentary Lifestyle on Skeletal Muscle NF-κB Signaling in Men - 0 views

www.ncbi.nlm.nih.gov/...PMC2904591

aging muscle muscle mass NF-kappaB sedentary lifestyle

shared by Nathan Goodyear on 14 Apr 15 - No Cached
  • Nathan Goodyear on 14 Apr 15
     
    Aging and sedentary lifestyle associated with muscle loss through NF-KappaB activation.
Nathan Goodyear

Testosterone-induced muscle hypertrophy is associated with an increase in satellite cel... - 0 views

ajpendo.physiology.org/...E197.long

Testosterone muscle muscle mass men male hormone hormones muscle satellite cells

shared by Nathan Goodyear on 14 Apr 15 - No Cached
  • Nathan Goodyear on 14 Apr 15
     
    Testosterone increases muscle satellite cells in men.
Nathan Goodyear

http://www.uclouvain.be/cps/ucl/doc/ir-ldri/images/BINDELS2013IJBCLB.pdf - 0 views

www.uclouvain.be/...BINDELS2013IJBCLB.pdf

dysbiosis gut flora gut gut microbiota muscle muscle mass

shared by Nathan Goodyear on 14 Apr 15 - No Cached
  • Nathan Goodyear on 14 Apr 15
     
    gut microflora and its impact on muscle loss/muscle growth.  Not just for lean versus fat evaluation.
Nathan Goodyear

Changes in muscle mass with mechanical load: possible cellular mechanismsThis... - 0 views

www.nrcresearchpress.com/...H09-010

resistance training weight training weight lifting mTOR muscle exercise

shared by Nathan Goodyear on 20 Mar 15 - No Cached
  • Nathan Goodyear on 20 Mar 15
     
    mTOR signaling pathway involved with building muscle (hypertrophy)
Nathan Goodyear

Testosterone physiology in resistance exercise an... [Sports Med. 2010] - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...21058750

resistance exercise physiology testosterone men male hormone hormones

shared by Nathan Goodyear on 29 Jul 14 - No Cached
  • testosterone stimulates protein synthesis
  • promotion of muscle hypertrophy by testosterone
  • intracellular androgen receptor (AR)
  • ...8 more annotations...
  • In general, testosterone concentration is elevated directly following heavy resistance exercise in men
  • Findings on the testosterone response in women are equivocal with both increases and no changes observed in response to a bout of heavy resistance exercise
  • Age also significantly affects circulating testosterone concentrations.
  • Aging beyond 35-40 years is associated with a 1-3% decline per year in circulating testosterone concentration in men
  • aging results in a reduced acute testosterone response to resistance exercise in men.
  • In women, circulating testosterone concentration also gradually declines until menopause, after which a drastic reduction is found.
  • acute increases in testosterone can be induced by resistance exercise
  • testosterone is an important modulator of muscle mass in both men and women
  • Nathan Goodyear on 29 Jul 14
     
    Resistance training to increase endogenous Testosterone production: more specific, the exercise must be high rep or as the authors call it--high volume.  To do this, the weight needs to be light.
Nathan Goodyear

Longitudinal Effects of Aging on Serum Total and Free Testosterone Levels in Healthy Me... - 0 views

press.endocrine.org/...jcem.86.2.7219

low t low Testosterone Testosterone SHBG FAI free androgen index male hormone hormones aging obesity

shared by Nathan Goodyear on 30 Mar 15 - No Cached
  • NUMEROUS CROSS-SECTIONAL INVESTIGATIONS have demonstrated lower concentrations of circulating testosterone (T) and/or free T in older men
  • Two small-scale longitudinal investigations have observed decreases, with aging, in total T
  • T levels decline at a more or less constant rate, with age, in men, with no period of accelerated decline
  • ...15 more annotations...
  • aging in men is associated with decreases in bone mineral density (BMD) (18, 19), lean body and muscle mass
  • strength (22, 23) and aerobic capacity (24), as well as with increases in total and abdominal body fat, low-density lipoprotein cholesterol, and/or low-density lipoprotein/high-density lipoprotein cholesterol ratios (25, 26, 27, 28), all of which also occur in nonelderly hypogonadal men
  • Most (1, 5, 6, 7, 8, 9), but not all (10, 11, 12), cross-sectional studies have demonstrated a decrease, with age, in total T in men
    • Nathan Goodyear
      Nathan Goodyear on 30 Mar 15
       
      FAI: 100 x total Testosterone nmol/L/SHBG nmol/L
    • Nathan Goodyear
      Nathan Goodyear on 30 Mar 15
       
      These numbers do point to an increase in ng/dl decline in Total Testosterone with increasing age (decade group)
  • total T, but not free T index, tended to decrease with greater BMI is consistent with prior studies showing that obesity is associated with decreases in both SHBG and total T, with an unchanged T-to-SHBG ratio
  • The conventional definition for T levels is statistical (values more than 2 sd below the mean), rather than functional. Such a definition does not reflect clinical realities, such as the existence of characteristic individual set points for circulating hormone levels, below which one, but not another, individual may develop metabolic changes of hormone deficiency; nor does it address the concept of reserve capacity, the possibility that persons with hormone levels 2 sd below the population mean still may have adequate hormone concentrations to meet their metabolic needs.
    • Nathan Goodyear
      Nathan Goodyear on 30 Mar 15
       
      good explanation of problems with just using a number to define low T
  • both T and free T index (a calculated value related to free or bioavailable T) decreased progressively at a rate that did not vary significantly with age, from the third to the ninth decades.
  • contrasts with other studies showing diminished free, as well as total, T in with increasing total (48) or abdominal (49) obesity in men.
  • Our analysis of date-adjusted T and free T index levels, by decade, showed that relatively high numbers of older men in this generally healthy population had at least one hypogonadal value (defined as below the 2.5th percentile for young men)
  • The issue of how properly to define hypogonadism, or indeed any hormone deficiency, remains problematic
  • The decrease in free T index was somewhat steeper than that of total T, owing to a trend for an increase in SHBG with age
  • LH for gonadal function
  • It would clearly be better to define the lower limit of normal for a hormone as: the blood level at which metabolic and/or clinical sequelae of hormone deficiency begin to appear, or the level below which definite benefits can be demonstrated for hormone supplementation for a significant proportion of the population
  • an effect of aging to lower both total and bioavailable circulating T levels at a relatively constant rate, independent of obesity, illness, medications, cigarette smoking, or alcohol intake
  • Nathan Goodyear on 30 Mar 15
     
    Article highlights the problems with the definition of low T.  This article finds consistent decline in Total Testosterone and FAI with increasing age groups, with a significant portion of men > 60 meeting the required levels for "low T".  This study found a decrease in total T and FAI at a consistent rate independent of variables, such as BMI.    This study did find a decrease in SHBG and total T with obesity; in contrast to other studies.
Nathan Goodyear

Total testosterone may not decline with ageing in Korean men aged 40 years or older. - ... - 0 views

www.ncbi.nlm.nih.gov/...22372615

total Testosterone ageing men male hormone hormones Testosterone glucose waist circumference BMI

shared by Nathan Goodyear on 01 Apr 15 - No Cached
  • Longitudinal change of TT was approximately + 0·8% per year.
  • TT was negatively correlated with body mass index (BMI), waist circumference and glucose
  • Nathan Goodyear on 01 Apr 15
     
    In study of 220 Korean mean, there was only a small decline in total Testosterone in men followed from 2002 to 2011.  The change amounted to 0.8% annually.  The level was 18.1 nmol to 17.8 nmol.  TT was inversely associated with BMI, waist and glucose.
Nathan Goodyear

International Journal of Obesity - Abstract of article: Antibiotic use and childhood bo... - 0 views

www.nature.com/...ijo2015218a.html

antibiotics gut microbiota gut flora gut microbiome gut metabolism

shared by Nathan Goodyear on 26 Oct 15 - No Cached
  • Nathan Goodyear on 26 Oct 15
     
    study finds that increased use of antibiotics throughout childhood leads to increased weight in adulthood. The authors observed "reversible, persistent, and progressive effects. We shouldn't be surprised. This effect has been seen in the cattle industry for years. Also displays the amazing effects of the gut flora on metabolism.
wheelchairindia9

Weight Cuff - 0 views

www.wheelchairindia.com/...Tynor-Weight-Cuff

The Best Exercise for Strengthening Shoulders improve muscle strength Iron pellets filled cuff multiple sclerosis patients rehab therapy programs allowing sufficient flexibility

shared by wheelchairindia9 on 06 Apr 16 - No Cached
  • wheelchairindia9 on 06 Apr 16
     
    Tynor Weight Cuff Tynor Weight cuffs are used to exercise ailing joints to build strength and aid recovery. Tynor Weight Cuff is flexible and cushion, so it does not injure. Recommended for use to improve muscle tone, muscle mass, strength and stamina. Tynor Weight Cuff Features Offers 1 kg resistance when wrapped around Weight is wrapped in comfortable and soft fabric Used to build muscles, flexibility or to lose weight Can be secured easily around to prevent injuries or accidents Cuff is safe to be used during everyday activities as well Tynor Weight Cuff Measurements Sizes Available: 1/2 Kg / 1Kg / 2 Kg
Nathan Goodyear

Anticancer mechanisms of cannabinoids - 0 views

www.ncbi.nlm.nih.gov/...PMC4791144

THC cannabinoids cancer

shared by Nathan Goodyear on 18 Sep 18 - No Cached
  • modulating key cell signalling pathways involved in the control of cancer cell proliferation and survival
  • cannabinoids inhibit angiogenesis and decrease metastasis in various tumour types in laboratory animals
  • Cannabis sativa L. (marijuana)
  • ...41 more annotations...
  • of the approximately 108 cannabinoids produced by C. sativa, Δ9-tetrahydrocannabinol (thc) is the most relevant because of its high potency and abundance in plant preparations
  • Tetrahydrocannabinol exerts a wide variety of biologic effects by mimicking endogenous substances—the endocannabinoids anandamide3 and 2-arachidonoylglycerol4,5—that engage specific cell-surface cannabinoid receptors
  • the cb2 receptor was initially described to be present in the immune system6, but was more recently shown to also be expressed in cells from other origins
  • transient receptor potential cation channel subfamily V, member 1
  • orphan G protein–coupled receptor 55
  • Most of the effects produced by cannabinoids in the nervous system and in non-neural tissues rely on cb1 receptor activation
  • two major cannabinoid-specific receptors—cb1 and cb2
  • cardiovascular tone, energy metabolism, immunity, and reproduction
  • cannabinoids are well known to exert palliative effects in cancer patients
  • best-established use is the inhibition of chemotherapy-induced nausea and vomiting
  • thc and other cannabinoids exhibit antitumour effects in a wide array of animal models of cancer
  • cannabinoid receptors and their endogenous ligands are both generally upregulated in tumour tissue compared with non-tumour tissue
  • cb2 promotes her2 (human epidermal growth factor receptor 2) pro-oncogenic signalling in breast cancer
  • pharmacologic activation of cannabinoid receptors decreases tumour growth
  • endocannabinoid signalling can also have a tumour-suppressive role
  • pharmacologic stimulation of cb receptors is, in most cases, antitumourigenic. Nonetheless, a few reports have proposed a tumour-promoting effect of cannabinoids
  • most prevalent effect is the induction of cancer cell death by apoptosis and the inhibition of cancer cell proliferation
  • impair tumour angiogenesis and block invasion and metastasis
  • thc and other cannabinoids induce the apoptotic death of glioma cells by cb1- and cb2-dependent stimulation
  • Autophagy is primarily a cytoprotective mechanism, although its activation can also lead to cell death
  • autophagy is important for cannabinoid antineoplastic activity
  • autophagy is upstream of apoptosis in the mechanism of cannabinoid-induced cell death
  • the effect of cannabinoids in hormone- dependent tumours might rely, at least in part, on the ability to interfere with the activation of growth factor receptors
  • glioma cells), pharmacologic blockade of either cb1 or cb2 prevents cannabinoid-induced cell death with similar efficacy
  • other types of cancer cells (pancreatic48, breast24, or hepatic43 carcinoma cells, for example), antagonists of cb2 but not of cb1 inhibit cannabinoid antitumour actions
  • thc promotes cancer cell death in a cb1- or cb2-dependent manner (or both) at lower concentrations
  • cannabidiol (cbd), a phytocannabinoid with a low affinity for cannabinoid receptors15, and other marijuana-derived cannabinoids57 have also been proposed to promote the apoptotic death of cancer cells acting independently of the cb1 and cb2 receptors
  • In cancer cells, cannabinoids block the activation of the vascular endothelial growth factor (vegf) pathway, an inducer of angiogenesi
  • In vascular endothelial cells, cannabinoid receptor activation inhibits proliferation and migration, and induces apoptosis
  • cb1 or cb2 receptor agonists (or both) reduce the formation of distant tumour masses in animal models of both induced and spontaneous metastasis, and inhibit adhesion, migration, and invasiveness of glioma64, breast65,66, lung67,68, and cervical68 cancer cells in culture
  • the ceramide/p8–regulated pathway plays a general role in the antitumour activity of cannabinoids targeting cb1 and cb2
  • cbd, by acting independently of the cb1 and cb2 receptors, produces a remarkable anti-tumour effect—including reduction of invasiveness and metastasis
  • cannabinoids can also enhance immune system–mediated tumour surveillance in some contexts
  • ability of thc to reduce inflammation75,76, an effect that might prevent certain types of cancer
  • recent observations suggest that the combined administration of cannabinoids with other anticancer drugs acts synergistically to reduce tumour growth
  • combined administration of gemcitabine (the benchmark agent for the treatment of pancreatic cancer) and various cannabinoid agonists synergistically reduced the viability of pancreatic cancer cells
  • Other reports indicated that anandamide and HU-210 might also enhance the anticancer activity of paclitaxel89 and 5-fluorouracil90 respectively
  • Combined administration of thc and cbd enhances the anticancer activity of thc and reduces the dose of thc needed to induce its tumour growth-inhibiting activity
  • Preclinical animal models have yielded data indicating that systemic (oral or intraperitoneal) administration of cannabinoids effectively decreases tumour growth
  • Combinations of cannabinoids with classical chemotherapeutic drugs such as the alkylating agent temozolomide (the benchmark agent for the management of glioblastoma80,84) have been shown to produce a strong anticancer action in animal models
  • pharmacologic inhibition of egfr, erk83, or akt enhances the cell-death-promoting action of thc in glioma cultures (unpublished observations by the authors), which suggests that targeting egfr and the akt and erk pathways could enhance the antitumour effect of cannabinoids
  • Nathan Goodyear on 18 Sep 18
     
    Good review of the anticancer effects of cananbinoids.
Nathan Goodyear

The Pharmacokinetics and Interactions of Ivermectin in Humans-A Mini-review - 0 views

www.ncbi.nlm.nih.gov/...PMC2751445

Ivermectin

shared by Nathan Goodyear on 19 Mar 18 - No Cached
  • This drug is extensively metabolized by human liver microsomes by cytochrome P450
  • cytochrome P-4503A4, converting the drug to at least 10 metabolites
  • its elimination half-life is around a day
  • ...12 more annotations...
  • second rise in plasma levels (mostly occurring between 6 and 12 h after the dose) suggesting an enterohepatic recycling of the drug
  • Ivermectin is exceptionally potent, with effective dosages levels that are unusually low.
  • the optimal dose of ivermectin is 150 μg/kg, but the frequency of administration is still controversial, ranging from 150 μg/kg once to three times yearly.
  • high lipid solubility of ivermectin, this compound is widely distributed within the body.
  • To interrupt the transmission of onchocerciasis in humans, the combination of ivermectin and doxycycline is highly effective as, in infested patients, the ingestion of the anthelmintic (200 μg/kg, single dose) and the antibacterial (100 mg/kg, daily for 6 weeks)
  • ivermectin interactions with another concurrently administered drugs can occur.
  • This issue becames important, as combination chemotherapy is being used with increasing frequency as resistance to antiparasitic agents is becoming more widespread.
  • haematomatous swellings
  • prothrombin times were significantly above baseline by one week to one month after drug ingestion, suggesting an antagonist effect against vitamin K
  • bleeding disorders were not found in 15,000 patients treated with ivermectin (150 μg/kg)
  • prolonged prothrombin ratios were observed in 148 subjects given ivermectin orally. Although no patients suffered bleeding complications, factor II and VII levels were reduced in most of them, suggesting interference with vitamin K metabolism
  • Ivermectin has a minimal effect on coagulation and concern about mass treatment for this reason appears to be unjustified
  • Nathan Goodyear on 19 Mar 18
     
    Review of Ivermectin as an anti-parasitic.
Nathan Goodyear

FDG-PET/CT imaging biomarkers in head and neck squamous cell carcinoma - 0 views

www.ncbi.nlm.nih.gov/...PMC3587845

PET scan cancer PET_CT scan maxSUV

shared by Nathan Goodyear on 19 Mar 18 - No Cached
  • F-fluoro-2-deoxyglucose (FDG) PET/CT is sensitive for the diagnosis and initial staging of several types of malignancies
  • SUV is a semiquantitative measure of the normalized concentration of radioactivity in a tumor or lesion
  • As FDG is the most common radiotracer used clinically and reflects tumor glucose metabolism, SUV is used as a surrogate marker for tumor metabolism.
  • ...9 more annotations...
  • primary tumor SUVmax >10 predicted survival, independent of the tumor stage and diameter
  • advanced tumors tend to have higher FDG uptake (and thus higher SUV values)
  • the impact of the SUV on treatment outcome has been observed even within a given tumor stage
  • The association between FDG uptake and tumor burden or stage has been well documented
  • FDG uptake not only reflects tumor burden/stage but also expresses, at least in part, some intrinsic biologic characteristic(s) of the tumor
  • SUVmax reflects the highest voxel value within the ROI or VOI. It is the most widely used parameter to measure metabolic tumor activity in oncologic FDG-PET/CT imaging
  • Several studies suggest that primary tumor baseline SUVmax also has predictive value in assessing the tumor burden, lymph node involvement and local extension
  • According to EORTC, a drop (delta between baseline and post-therapy) of 15–25% in SUVmax may represent a good treatment response
  • PERCIST criteria was proposed by the investigators at the Johns Hopkins Medical Institutions and suggested that a decrease in SUV normalized to lean body mass of at least 30% should be achieved before considering partial tumor response
  • Nathan Goodyear on 19 Mar 18
     
    Good review of PET/CT scan and MaxSUV in head and neck cancers.
Nathan Goodyear

Frontiers | Branched-Chain Amino Acid Ingestion Stimulates Muscle Myofibrillar Protein ... - 1 views

journal.frontiersin.org/...full

BCAA amino acids resistance training exercise recovery exercise muscle

shared by Nathan Goodyear on 18 Jul 17 - No Cached
  • BCAAs exhibit the capacity to stimulate myofibrillar-MPS, however a full complement of EAA could be necessary to stimulate a maximal response of myofibrillar-MPS following resistance exercise
  • This information potentially has important nutritional implications for selecting amino acid supplements to facilitate skeletal muscle hypertrophy in response to resistance exercise training and the maintenance of muscle mass during aging, unloading, or disease
  • results from the present study suggest that ingesting BCAAs alone, without the other EAA, provides limited substrate for protein synthesis in exercised muscles
  • ...3 more annotations...
  • the overall response of MPS is not maximized. Instead, the limited availability of EAA likely explains the qualitative difference in magnitude of the MPS response to ingestion of BCAAs alone and ingestion of similar amounts of BCAAs as part of intact whey protein
  • decreased EAA concentrations following leucine ingestion
  • these data support the notion that EAA availability is the rate-limiting factor for stimulating a maximal MPS response to resistance exercise with BCAA ingestion
  • Nathan Goodyear on 18 Jul 17
     
    Complete amino acid supplementation exceeds muscle building capacity (myofibrillar-MPS) over BCAA alone.
Nathan Goodyear

Resistance Training for Glycemic Control, Muscular Strength, and Lean Body Mass in Old ... - 0 views

www.ncbi.nlm.nih.gov/...28382531

diabetes sarcopenia sarcopenic obesity muscle weight lifting resistance training

shared by Nathan Goodyear on 17 Apr 17 - No Cached
  • Nathan Goodyear on 17 Apr 17
     
    8 weeks of resistance training in patients with sarcopenia and diabetes found to improve glycemic control
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