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Nathan Goodyear

Thieme E-Journals - International Journal of Sports Medicine / Abstract - 0 views

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    competition versus recovery period in wrestling reveals different salivary hormone ratios. Competition results in low Testosterone to cortisol ratio versus the recovery phase which was found to be associated with a high testosterone to cortisol ratio.
Nathan Goodyear

Behaviour of saliva cortisol [C], testost... [Eur J Appl Physiol. 2003] - PubMed - NCBI - 0 views

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    salivary hormone evaluation reveals cortisol increases during athletic  competition due primarily to a increase in salivary cortisol production.  The result is a decrease in T:C ratio during competition.  In the recovery phase, cortisol decreases to baseline, but the testosterone rises above baseline, thus increasing the T:C ratio in the recovery phase.  This lasted up to 5 days in this study.
Nathan Goodyear

Changes in cortisol and testostero... [J Sports Med Phys Fitness. 2000] - PubMed - NCBI - 0 views

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    long endurance competitive events associated with catabolic hormone balances found in a low T:C ratio.  This occurs primarily through an elevation in cortisol and small drop in Testosterone.  The recovery phase is anabolic through a rise in T:C, primarily through a return to baseline by cortisol and an increase in Testosterone.
Nathan Goodyear

Psychoendocrine and physical performan... [Aggress Behav. 2008 Nov-Dec] - PubMed - NCBI - 0 views

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    Rugby training resulted in a decrease in T:C salivary ratio through a decline in resting testosterone level.  In contrast, competition events increased the T:C ratio primarily through an increase in Cortisol production.
Willow O'Donnell

Willow Medical - Buy IV pumps - tupalo - 0 views

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Nathan Goodyear

Carbohydrates for training and competition. - PubMed - NCBI - 0 views

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    Only abstract available here.  Article looked at the evidence of daily carb intake for levels of training: low training-3-5 g/kg; moderate training (1h)-5-7 g/kg; endurance training (1-3h)-6-10 g/kg; extreme endurance (>4-5h)-8-12 g/kg   
Nathan Goodyear

https://neogenissport.com/wp-content/uploads/2014/05/Beet-the-Competition.pdf - 0 views

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    Beet juice for exercise performance and recovery.
Rahul Sharma

Membrane Filters with Absorbent Pads, Gridded Membrane Filters - 0 views

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    Axiva supplies membrane filters with absorbent pads at competitive prices in India and many countries. This gridded membrane filters are available with or without an absorbent nutrient pads.
Nathan Goodyear

Outcompeting p53-Mutant Cells in the Normal Esophagus by Redox Manipulation - ScienceDi... - 0 views

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    Low dose radiation from CT found to contribute to altered genetic expression of p53 tumor suppressor gene to give competitive advantage to potential cancer cells over health cells.
indian-health

Eye Surgery India Giving Hopes To Dimming Vision - 0 views

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    In terms of eye surgical treatment, India's healthcare facilities and surgeons are globally- competitive and can offer positive results.
indian-health

Eye Surgeons In India Can Improve Your Eyesight - 0 views

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    India's healthcare facilities and surgeons are global-competitive and can offer positive results. Eye surgeons in India are skilled in performing various types of eye surgeries, including laser eye surgery, following international standards.
spineneuro

Cutting-Edge Care: Unveiling the Price Tag of Robotic Spine Surgery in India - 0 views

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    The cost of robotic spine surgery India is notably affordable, remaining a fraction of the expenses incurred in other nations. Even when factoring in accommodation and boarding costs, the cost of robotic spine surgery India remains the lowest globally. The country is renowned for providing exceptionally competitive cost of robotic spine surgery India at some of the most prestigious medical establishments.
Nathan Goodyear

EHP - Competitive Androgen Receptor Antagonism as a Factor Determining the Pr... - 0 views

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    Many pesticides function as androgen receptor antagonists.  Others as Xenoestrogens.  Estrogen-like toxins and androgen receptor antagonists...a potent cocktail to disrupt male androgen signaling.
Nathan Goodyear

The Ketogenic Diet and Sport: A Possible Marriage? : Exercise and Sport Sciences Reviews - 0 views

  • It is important to note that, although the blood level of glucose drops, it still remains at a physiological level (23), which is maintained through gluconeogenesis involving glucogenic amino acids and also glycerol released from triglycerides
  • “physiological ketosis” where KB levels may rise to 7 to 8 mmol L-1 (but without any pH change). In “pathological diabetic ketoacidosis,” on the other hand, ketonemia can exceed 20 mmol L-1 and also cause lowering of blood pH
  • in the initial phase of KD, about 16% of glucose comes from glycerol (released from triglyceride hydrolysis) and the bulk (60–65 g) from proteins via gluconeogenesis (proteins may be of either dietary or endogenous origin
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  • the protein supply consumed during a KD “preserves,” as demonstrated, lean body mass
  • The importance of glycerol as a glucose source increases progressively during ketosis; in fact, glycerol passes from supplying 16% of total glucose to an average of 60% after many days (>7 d) of complete fasting (from 38% in lean individual to 79% in the obese).
  • The possible reasons for the effectiveness of KD for weight loss may be listed as follows, in order of evidence, strongest first: Figure 3Image Tools 1. Appetite reduction: protein satiety, effects on appetite-related hormones such as ghrelin, and possibly a sort of direct appetite-blocking effect of KB 2. Reduced lipogenesis and increased fat oxidation 3. A reduction in respiratory quotient may indicate a greater metabolic efficiency in fat oxidation 4. A thermic effect of proteins and increased energy usage by gluconeogenesis
  • all data regarding biochemical and molecular mechanisms suggest that it is very difficult to increase muscle mass during a KD; use of which really should be limited to the few days immediately before competition in bodybuilding.
  • a long-term KD can interfere with some muscle hypertrophy mechanisms and this could be counterproductive if the aim of the athlete is to gain muscle mass
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    Great read on the ketogenic  and its application to sports/training...
Nathan Goodyear

Weight Status Among Adolescents in States That Govern Competitive Food Nutrition Content - 0 views

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    Scary study.  This study seems to show that state laws are the way to reduce BMI.  BMI is not a reliable measurement of Percent fat.  So, I question this study all together.  But their conclusion seems to be to attack obesity through legislation.  You should attack obesity through education.
Mirage Marketing

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Manual Wheelchairs - 0 views

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Nathan Goodyear

Sports drinks, exercise training, and competition. [Curr Sports Med Rep. 2008 Jul-Aug] ... - 0 views

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    pro-longed training and electrolyte/carb containing drinks
Nathan Goodyear

Exercise-induced right ventricular dysfunction and structural remodelling in endurance ... - 0 views

  • In a cohort of well-trained athletes, we demonstrated that intense endurance exercise causes an acute reduction in RV function that increases with race duration and correlates with increases in biomarkers of myocardial injury
  • no relationship between LV function and biomarker levels
  • focal gadolinium enhancement and increased RV remodelling were more prevalent in those athletes with a longer history of competitive sport, suggesting that repetitive ultra-endurance exercise may lead to more extensive RV change and possible myocardial fibrosis
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  • he cardiac impact of both acute and cumulative exercise is greatest on the RV.
  • Greater reductions in RV function occurred in those athletes competing for a longer duration, suggesting that the heart has a finite capacity to maintain the increased work demands of exercise
  • cardiac injury is greatest in the least trained
  • Previous investigators have documented reductions in RV function in less trained subjects over the marathon distance
  • We enrolled elite and subelite athletes and found a significant association between fitness (VO2max) and the reduction in post-race RVEF
  • Even after many years of detraining, cardiac dilation may not completely regress in elite athletes
  • The focus on well-trained athletes may be of particular relevance, given that they perform exercise of highest intensity and duration most frequently, and, thus, may be at a greater risk of cumulative injury.
  • The lack of correlation between increases in troponin and changes in LV function seen in this study has been previously interpreted as evidence that post-exercise elevations in cardiac biomarkers are benign.
  • a significant correlation between changes in RVEF and post-race biomarker levels and this relationship was even stronger in the athletes who completed the race of longest duration, the ultra-triathlon
  • The correlations with RVEF, but not LVEF, provide further evidence of the differential effects of intense exercise on RV and LV function
  • BNP release during intense exercise is associated with greater relative increases in RV systolic pressures, but not LV pressures
  • BNP may provide a measure of both acute RV load and the resultant fatigue which occurs when this load is sustained
  • It has been demonstrated that ventricular load increases with exercise intensity and is greater for the RV than the LV,29 thus potentially explaining why the RV is more susceptible to fatigue after prolonged exercise.
  • This study demonstrates, for the first time, an association between endurance exercise of increasing duration and structural, functional, and biochemical markers of cardiac dysfunction in highly trained athletes
  • Functional abnormalities were confined to the RV and were largely reversible 1 week following the event
  • there remained a significant minority of athletes in whom there was evidence of myocardial fibrosis in the interventricular septum
  • RV abnormalities may be acquired through cumulative bouts of intense exercise and provides direction for prospective investigations aimed at elucidating whether extreme exercise may promote arrhythmias in some athletes.
  • the acute injury and chronic remodelling of the myocardium both disproportionately affect the RV and it remains possible that the two are linked.
  • focal DGE was confined to the interventricular septum and commonly at the site of RV attachment
  • emerging evidence that intense endurance exercise may be associated with an excess in arrhythmic disorders, the mechanisms for which remain unexplained
  • RVEF (and not LVEF) was reduced in athletes with complex ventricular arrhythmias when compared with healthy athletes and non-athletes without arrhythmias
  • it is premature to conclude that these changes may represent a proarrhythmic substrate
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    Study finds endurance racing results in reduce Right ventricle ejection fraction even in elite athletes.  This post-race RVEF reduction is associated with VO2max.
Nathan Goodyear

Intravenous Fluid Use in Athletes - 0 views

  • 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
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  • 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
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