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Nathan Goodyear

Acupuncture blocks cold stress-induced increases in the hypothalamus-pituitary-adrenal ... - 0 views

joe.endocrinology-journals.org/...95

acupuncture stress HPA sympathetic nervous system

shared by Nathan Goodyear on 28 May 13 - No Cached
  • Nathan Goodyear on 28 May 13
     
    acupuncture decreases HPA sympathetic drive.  Acupuncture calms the HPA axis and relieves stress.  Granted this is in a rat model.
Nathan Goodyear

Abuse-related posttraumatic stress dis... [Psychosom Med. 1995 Mar-Apr] - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...7792368

PTSD norepinephrine noradrenaline sympathetic system stress trauma

shared by Nathan Goodyear on 07 Feb 12 - No Cached
  • Nathan Goodyear on 07 Feb 12
     
    chronic elevated norepinephrine and sympathetic activation foun din those individuals suffering from PTSD.
Nathan Goodyear

Sympathetic overactivity precedes metabolic dysfunction in a fructose model of glucose ... - 0 views

ajpregu.physiology.org/...R950

fructose metabolic dysfunction

shared by Nathan Goodyear on 17 Sep 13 - No Cached
  • Nathan Goodyear on 17 Sep 13
     
    fructose increases sympathetic tone.  This has important implications in metabolic syndrome and cardiovascular disease.
Nathan Goodyear

Insulin and Sympathoexcitation: It Is Not All in Your Head - 0 views

diabetes.diabetesjournals.org/...2654.extract

insulin blood pressure

shared by Nathan Goodyear on 07 Aug 13 - No Cached
  • Nathan Goodyear on 07 Aug 13
     
    Insulin has a stimulatory effect on the sympathetic system resulting in elevated B/P.  There is a movement by some to put every diabetic on insulin early.  This is seriously flawed and will only contribute to further complications.
Nathan Goodyear

Association of sympathovagal imbalance with cardi... [Endocr Res. 2014] - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...24866562

PCOS HRV women hormone hormones cardiovascular risk

shared by Nathan Goodyear on 03 Jun 14 - No Cached
  • Nathan Goodyear on 03 Jun 14
     
    Interesting study looked PCOS and the sympathetic vagal system and cardiovascular disease risk. They found that those with PCOS were found to have sympathovagal imbalance and decreased HRV.  Low HRV has been clearly associated with increased cardiovascular disease.  They also found insulin resistance and dyslipidemia to be associated with sympthovagal imbalance and cardiovascular risk as well.
Nathan Goodyear

The role of mercury and cadmi... [Altern Ther Health Med. 2007 Mar-Apr] - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...17405690

Mercury Hg Cadmium Cd CVD hypertension cardiovascular disease COMT

shared by Nathan Goodyear on 16 Sep 14 - No Cached
  • Nathan Goodyear on 16 Sep 14
     
    Heavy metals play a role in the development of CVD.  Hg and Cd in particular play a role in hypertension.
Nathan Goodyear

Access : Cardiovascular effects of leptin : Nature Reviews Cardiology - 0 views

www.nature.com/...nrcardio.2009.224.html

cardiovascular leptin effects

shared by Nathan Goodyear on 24 May 11 - No Cached
  • obesity and hyperleptinemia have often been associated with hypertension, and regulation of sympathetic tone or direct effects of leptin on contributors such as atherosclerosis, endothelial dysfunction, and thrombosis have been documented
  • Nathan Goodyear on 24 May 11
     
    Leptin and cardiovascular disease
Nathan Goodyear

Intravenous Fluid Use in Athletes - 0 views

www.ncbi.nlm.nih.gov/...PMC3435915

IV nutrition intravenous fluids exercise sports medicine sports athlete athletes

shared by Nathan Goodyear on 13 Jan 15 - No Cached
  • The current data suggest that IV rehydration is faster than oral
  • There may be physiological benefits of decreased heart rate and norepinephrine in athletes rehydrated via IV route
  • Muscle damage during exercise in the heat was assessed by myoglobin and creatine kinase
  • ...4 more annotations...
  • Postexercise blood 1 hour and 24 hours showed no differences in circulating myoglobin or creatine kinase
  • IV administration of fluids can rapidly replace plasma volume
  • The rapid increase in plasma volume is transient, and no measureable difference between IV and oral prehydration exists after 15 minutes of exercise
  • The use of IV fluid may be beneficial for a subset of fluid sensitive athletes
  • Nathan Goodyear on 13 Jan 15
     
    IV nutrition pre-event, intra-event, and post-event for recovery.
Nathan Goodyear

Intravenous Fluid Use in Athletes - 0 views

www.ncbi.nlm.nih.gov/...PMC3435915

IV intravenous fluid nutrition athletes athlete sports medicine sports exercise

shared by Nathan Goodyear on 13 Jan 15 - No Cached
  • Treatment of exercise-associated hyponatremia with hypertonic IV infusion to correct plasma sodium levels is also a standard and accepted use of IV fluid infusions
  • athletes who present for medical care with hypernatremia who cannot tolerate oral fluids can benefit from IV fluids
  • Vaporization of sweat accounts for 80% of heat loss in hot, dry atmospheric conditions. This mechanism of water loss is the major contributor for exercise-associated dehydration
  • ...30 more annotations...
  • The rate of water loss can be quantified through measurement of sweat rate
  • Pre- and postexercise body weight measurements are the most common means to estimate overall water loss but are condition specific
  • It appears that 1% to 2% body weight loss is well tolerated by the exercising athlete
  • Dehydration, defined as greater than 2% loss of body weight, can negatively affect performance
  • In highly trained endurance athletes, plasma volume and sodium serum concentration were preserved despite a 5% body weight loss
  • In Ironman triathletes, dehydration to 5% body weight loss did not correlate with occurrence of medical complications
  • hydration should begin hours prior to exercise, especially if known deficits are present, and fluids should be consumed at a slow, steady rate, with 5 to 7 mL/kg taken 4 hours prior to exercise
  • Sodium concentration did not produce significant changes in the rate of absorption but was primarily dependent on carbohydrate concentration
  • Replacing 150% of body weight loss over 60 minutes has been tolerated without complications
  • IV treatment of severe dehydration (>7% body weight loss), exertional heat illness, nausea, emesis, or diarrhea, and in those who cannot ingest oral fluids for other reasons, is clinically indicated
  • A recent survey of the National Football League teams revealed that 75% (24 of 32) of the teams utilized IV infusion of fluids for prehydration in at least some otherwise healthy individuals
  • In the National Football League, an average of 1.5 L of normal saline was administered approximately 2.5 hours prior to competition
  • after 2 hours of exercise, the rectal temperature was 0.6° higher in the group not receiving IV infusion. Also, stroke volume and cardiac output were 11% to 16% lower in the control group versus the IV infusion group.
  • Recent evidence suggests the etiology of EAMC is related to muscle fatigue and neuronal excitability
  • no correlation between hydration status or electrolyte concentrations with EAMC
  • there may be a subset of muscle cramping that is associated with a loss of both body fluid and sodium
  • Glycerol is the primary agent for oral hyperhydration
  • elevation of plasma volume by 200 to 300 mL via dextran infusion resulted in 15% increase in stroke volume, 4% increase in VO2 max, and an increase in the exercise time to fatigue
  • Neither the tonicity nor mode of hydration resulted in improved speed of rehydration, greater fluid retention, or improved performance
  • There are beneficial anecdotal reports of EAMC treatment in elite and professional-level athletes with IV hydration during the course of an event
  • Plasma volume was better restored during rehydration with IV fluids at preexercise and 5 minutes of exercise. At 15 minutes, there was no difference between IV and oral rehydration
  • More rapid restoration of plasma volume was accomplished in the IV treatment group with no advantages over oral rehydration in physiological strain, heat tolerance, ratings of perceived effort, or thermal sensations
  • No difference was found in exercise time to exhaustion. IV and oral rehydration methods were equally effective. Heart rates were statistically higher in the oral rehydration group through 75 minutes of exercise, and there were higher increases in norepinephrine plasma concentrations
  • No significant differences between the groups were found for time to recovery, number of days with pain, number of days with stiffness, sleep disturbance, fatigue, rectal temperature, and loss of appetite
  • The current data suggest that IV rehydration is faster than oral
  • There may be physiological benefits of decreased heart rate and norepinephrine in athletes rehydrated via IV route
  • Postexercise blood 1 hour and 24 hours showed no differences in circulating myoglobin or creatine kinase
  • The use of IV fluid may be beneficial for a subset of fluid sensitive athletes
  • this should be reserved for high-level athletes with strong histories of symptoms in well-monitored settings.
  • Volume expanders may also be beneficial for some athletes
  • Nathan Goodyear on 13 Jan 15
     
    to be read
Nathan Goodyear

Renin-angiotensin system and cancer: A review - 0 views

www.oatext.com/system-and-cancer-A-review.php

renin angiotensin system cancer

shared by Nathan Goodyear on 10 Sep 18 - No Cached
  • crucial role of the RAS in the development and maintenance of cancer
  • kidneys, which produce renin in response to decreased arterial pressure, reduced sodium in the distal tubule, or sympathetic nervous system activity via the β-adrenergic receptors
  • Renin is secreted from the juxtaglomerular cells into the bloodstream where it encounters angiotensinogen (AGN), normally produced by the liver
  • ...22 more annotations...
  • Renin catalyses the conversion of AGN to angiotensin I (ATI), which is quickly cleaved by angiotensin converting enzyme (ACE) to form angiotensin II (ATII)
  • ATII triggers the release of aldosterone from the adrenal glands, which stimulates reabsorption of sodium and water and thereby increases blood volume and blood pressure
  • ATII also acts on smooth muscle to cause vasoconstriction of the arterioles
  • ATII promotes the release of antidiuretic hormone from the posterior pituitary gland, which results in water retention and triggers the thirst reflex
  • ability of non-CSCs to ‘de-differentiate’ into CSCs due to epigenetic or environmental factors, which further increases the complexity of tumour biology and treatment
  • efficacy of RAS modulators on cancer in both cancer models and cancer patients
  • A localised (‘paracrine’) RAS mechanism has been identified in many types of cancers, and interruption of the control of the RAS is thought to be the basis for its role in cancer
  • Components of the RAS are expressed by these CSCs, supporting the hypothesis of the presence of a ‘paracrine RAS’ in regulating these CSCs
  • Renin is an enzyme normally released by the kidneys in response to falling arterial pressure
  • a study of GBM demonstrating overexpression of PRR coupled with the observation that inhibition of renin reduces cellular proliferation and promotes apoptosis
  • PRR has been found to be vital for normal Wnt signalling
  • A major focus of PRR research is its relationship with Wnt signalling
  • suggest a crucial role for PRR activation on the proliferation of CSCs, possibly via Wnt/β-catenin signalling, leading to carcinogenesis.
  • Angiotensin converting enzyme (ACE), also known as CD143, is the endothelial-bound peptidase which physiologically converts ATI to ATII
  • ACE is crucial in the regulation of blood pressure, angiogenesis and inflammation
  • results suggest that an overactive ACE promotes cancer growth and progression, and an inhibited or low-activity ACE may have cancer-protective effects
  • When bound to ATII or ATIII it causes vasoconstriction by stimulating the release of vasopressin, reabsorption of water and sodium by promoting secretion of aldosterone and insulin, fibrosis, cellular growth and migration, pro-inflammation, glucose release from the liver, increased plasma triglyceride concentration, and reduced gluconeogenesis
  • ATIIR1 is a G-protein-coupled receptor, with downstream signalling involved in vasodilation, hypertrophy and NF-κB activation leading to TNF-α and PAI-1 expression
  • ATIIR1 has well-documented links with cancer, with one study demonstrating its overexpression in ~20% of breast cancer patients
  • the effect of RAS dysregulation has been associated with increased VEGF expression and angiogenesis in cancers
  • In ovarian and cervical cancer, ATIIR1 overexpression has been shown to be an indicator of tumour invasiveness
  • administration of ATIIR1 blockers (ARBs) have been associated with reduced tumour size, reduction in tumour vascularisation, lower occurrence of metastases, and lower VEGF levels
  • Nathan Goodyear on 10 Sep 18
     
    Great review on RAS in cancer.
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buy adderall online at onlinemedzonline .com - 0 views

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Nathan Goodyear

The acute effect of high-dose intravenous vitamin C and other nutrients on blood pressu... - 0 views

www.ncbi.nlm.nih.gov/...PMC4864764

vitamin C IV vitamin C hypertension vitamin B12 blood pressure cardiovascular disease CVD

shared by Nathan Goodyear on 14 Aug 17 - No Cached
  • the reduction in BP within the first 10–20 min may be primarily attributed to a direct vasodilatory physiological effect, described as venodilation
  • BP reduction observed after 70–90 min is likely attributable to pharmacokinetically plausible vitamin C absorption and vasodilation because of nitric oxide release
  • Pharmacokinetic studies of IVC administration observed peak plasma levels within the first 90 min, with plasma levels reaching 13350 μmol/l for 50 g of IVC
  • ...6 more annotations...
  • Essential hypertension, associated with endothelial dysfunction because of an impaired nitric oxide/l-arginine pathway and impaired vasodilation can be restored by vitamin C
  • marked increase in BP response when IVB12 is administered
  • The mean BP increased significantly up to 12–16 mmHg systolic and diastolic independent of the dosage of vitamin B12
  • The production of norepinephrine, which can stimulate angiotensin-II production, which in turn influences BP, has been suggested as a possible mechanism for the increase in BP with IVB12
  • excess norephinephrine levels stimulate the sympathetic nervous system, leading to increased cortisol production, which has also been linked to increases in BP
  • Animal studies have found higher serum levels of norepinephrine (noradrenaline) in the adrenal medulla of rats receiving methylcobalamin (methyl-vitamin B12)
  • Nathan Goodyear on 14 Aug 17
     
    IV vitamin C in mostly normotensive patients (> 30 grams) reduced blood pressure.  Some of the patients were pre-hypertensive. Vitamin B12 increase the blood pressure.
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