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Nathan Goodyear

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

eurheartj.oxfordjournals.org/...998

endurance athletes training heart health injury

shared by Nathan Goodyear on 09 Jan 15 - No Cached
  • 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
  • ...22 more annotations...
  • 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
  • We enrolled elite and subelite athletes and found a significant association between fitness (VO2max) and the reduction in post-race RVEF
  • Previous investigators have documented reductions in RV function in less trained subjects over the marathon distance
  • cardiac injury is greatest in the least trained
  • 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
  • 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.
  • 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
  • The correlations with RVEF, but not LVEF, provide further evidence of the differential effects of intense exercise on RV and LV function
  • 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
  • Nathan Goodyear on 09 Jan 15
     
    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

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

ScienceDirect.com - Nutrition - Vitamin C status and perception of effort during exerci... - 0 views

www.sciencedirect.com/...S0899900712000809

vitamin C vitamin C fatigue athlete athletic performance heart rate obesity overweight exercise

shared by Nathan Goodyear on 12 Jul 12 - No Cached
  • Nathan Goodyear on 12 Jul 12
     
    A very small study, but vitamin C shown to reduce fatigue, perception of fatigue and reduced heart rate.  This has implications in improving athletic performance.  The question, what does high dose vitamin C due for fatigue, heart rate, and athletic performance.
Nathan Goodyear

Exercise and Testosterone - 0 views

www.sast.org.tw/...FI1112060008_aO.pdf

testosterone training athletic performance athlete athletic muscle

shared by Nathan Goodyear on 26 Jun 12 - No Cached
  • Nathan Goodyear on 26 Jun 12
     
    type and length of training effects testosterone secretion. Testosterone plays an important role in muscle performance and mass. Prolonged training can result in a decrease in testosterone level. This has significance with highly trained athletes. One pitfall of this study was the assessment of testosterone via serum.
Nathan Goodyear

The effect of strength training on performance in endurance athletes. - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...24532151

strength training endurance athletes athletes

shared by Nathan Goodyear on 10 Jan 15 - No Cached
  • Nathan Goodyear on 10 Jan 15
     
    strength training improved performance of endurance athletes.  This study is a meta-analysis.
Nathan Goodyear

JISSN | Full text | International Society of Sports Nutrition position stand: creatine ... - 0 views

www.jissn.com/6

creatine sports nutrition exercise

shared by Nathan Goodyear on 27 Jan 14 - No Cached
  • the energy supplied to rephosphorylate adenosine diphosphate (ADP) to adenosine triphosphate (ATP) during and following intense exercise is largely dependent on the amount of phosphocreatine (PCr) stored in the muscle
  • Creatine is chemically known as a non-protein nitrogen
  • It is synthesized in the liver and pancreas from the amino acids arginine, glycine, and methionine
  • ...26 more annotations...
  • Approximately 95% of the body's creatine is stored in skeletal muscle
  • About two thirds of the creatine found in skeletal muscle is stored as phosphocreatine (PCr) while the remaining amount of creatine is stored as free creatine
  • The body breaks down about 1 – 2% of the creatine pool per day (about 1–2 grams/day) into creatinine in the skeletal muscle
  • The magnitude of the increase in skeletal muscle creatine content is important because studies have reported performance changes to be correlated to this increase
  • "loading" protocol. This protocol is characterized by ingesting approximately 0.3 grams/kg/day of CM for 5 – 7 days (e.g., ≃5 grams taken four times per day) and 3–5 grams/day thereafter [18,22]. Research has shown a 10–40% increase in muscle creatine and PCr stores using this protocol
  • Additional research has reported that the loading protocol may only need to be 2–3 days in length to be beneficial, particularly if the ingestion coincides with protein and/or carbohydrate
  • A few studies have reported protocols with no loading period to be sufficient for increasing muscle creatine (3 g/d for 28 days)
  • Cycling protocols involve the consumption of "loading" doses for 3–5 days every 3 to 4 weeks
  • Most of these forms of creatine have been reported to be no better than traditional CM in terms of increasing strength or performance
  • Recent studies do suggest, however, that adding β-alanine to CM may produce greater effects than CM alone
  • These investigations indicate that the combination may have greater effects on strength, lean mass, and body fat percentage; in addition to delaying neuromuscular fatigue
  • creatine phosphate has been reported to be as effective as CM at improving LBM and strength
  • Green et al. [24] reported that adding 93 g of carbohydrate to 5 g of CM increased total muscle creatine by 60%
  • Steenge et al. [23] reported that adding 47 g of carbohydrate and 50 g of protein to CM was as effective at promoting muscle retention of creatine as adding 96 g of carbohydrate.
  • It appears that combining CM with carbohydrate or carbohydrate and protein produces optimal results
  • Studies suggest that increasing skeletal muscle creatine uptake may enhance the benefits of training
  • Nearly 70% of these studies have reported a significant improvement in exercise capacity,
  • Long-term CM supplementation appears to enhance the overall quality of training, leading to 5 to 15% greater gains in strength and performance
  • Nearly all studies indicate that "proper" CM supplementation increases body mass by about 1 to 2 kg in the first week of loading
  • short-term adaptations reported from CM supplementation include increased cycling power, total work performed on the bench press and jump squat, as well as improved sport performance in sprinting, swimming, and soccer
  • Long-term adaptations when combining CM supplementation with training include increased muscle creatine and PCr content, lean body mass, strength, sprint performance, power, rate of force development, and muscle diameter
  • subjects taking CM typically gain about twice as much body mass and/or fat free mass (i.e., an extra 2 to 4 pounds of muscle mass during 4 to 12 weeks of training) than subjects taking a placebo
  • The gains in muscle mass appear to be a result of an improved ability to perform high-intensity exercise via increased PCr availability and enhanced ATP synthesis, thereby enabling an athlete to train harder
  • there is no evidence to support the notion that normal creatine intakes (< 25 g/d) in healthy adults cause renal dysfunction
  • no long-term side effects have been observed in athletes (up to 5 years),
  • One cohort of patients taking 1.5 – 3 grams/day of CM has been monitored since 1981 with no significant side effects
  • Nathan Goodyear on 27 Jan 14
     
    Nice review of the data, up to the publication date, on creatine.
Nathan Goodyear

The nutriceutical bovine colostrum truncates the increase in gut permeability caused by... - 0 views

ajpgi.physiology.org/...G477.abstract

athletes colostrum exercise leaky gut

shared by Nathan Goodyear on 23 May 11 - No Cached
  • Nathan Goodyear on 23 May 11
     
    colostrum improves gut permeability, and may improve performance and prevent injuries in athletes
Nathan Goodyear

https://www.cayugamed.org/docs/Nutrition_Update_for_the_Ultraendurance_Athlete%208.pdf - 0 views

www.cayugamed.org/...Ultraendurance_Athlete%208.pdf

endurance athletes endurance exercise nutrition athletes athlete

shared by Nathan Goodyear on 10 Jan 15 - No Cached
  • Nathan Goodyear on 10 Jan 15
     
    Nutrition for ultra endurance.  To be read.
Nathan Goodyear

Influence of dietary carbohydrate intake on the free testosterone: cortisol ratio respo... - 0 views

www.ncbi.nlm.nih.gov/...20091182

Testosterone exercise training sports medicine cortisol athletes hormones

shared by Nathan Goodyear on 03 Feb 17 - No Cached
  • Nathan Goodyear on 03 Feb 17
     
    excessive carb restriction in athletes can lower Testosterone levels and negatively impact Testosterone to cortisol ratio. This will limit performance and hinder recovery.
Nathan Goodyear

Saliva cortisol, testosterone and T/C ratio... [Int J Sports Med. 1999] - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...10190771

saliva salivary Testosterone athletes cortisol catabolic sports recovery T:C ratio

shared by Nathan Goodyear on 25 Apr 12 - No Cached
  • Nathan Goodyear on 25 Apr 12
     
    this study looked at salivary testosterone and cortisol in exercise recovery.  They found a low T/C ratio in this athletes.  This is a catabolic state.  A normalization of the a low T/C ratio will increase muscle recovery and should improve performance.  Testing was with saliva
Nathan Goodyear

ARTICLES | Journal of Applied Physiology - 0 views

jap.physiology.org/...japplphysiol.00429.2016

recovery exercise athletic performance athletic training athlete

shared by Nathan Goodyear on 13 Jun 16 - No Cached
  • Nathan Goodyear on 13 Jun 16
     
    Recovery doesn't just relate to exercise; recovery relates to travel.
wheelchairindia9

R O M Knee Brace - 0 views

www.wheelchairindia.com/...Tynor-R-O-M-Knee-Brace

Functional Braces Best for: Sports injuries after surgery functional knee braces knee rehabilitation program knee injuries or knee surgery free movement of the knee joint decrease knee pain improve knee stability

shared by wheelchairindia9 on 21 Mar 16 - No Cached
  • wheelchairindia9 on 21 Mar 16
     
    PF Night Splint Compared to plantar based splints, patients prefer dorsal models because they are less bulky, cooler, lower profile and easier to walk in at night. PF Night Splint includes all of these features and more. Neoprene calf and toe straps along with gel padding on the top of the foot help reduce pressure points and the plastic-free bottom offers safer nighttime ambulation. Even added more room in the forefoot to accommodate wider feet and new flexible shell allows easier nighttime ambulation without compromising the ability to hold the foot at 90° during rest. Finally, a plantar fasciitis splint patients will wear all night! Neoprene calf. Padded foam liner. Fits right or left. Not made with natural rubber latex. PF Night Splint (Derotation) Applications Prevention and correction of foot drop. Night splint for early healing. Ambulatory, can be used as a day splint. Perfect post-operative immobilisation and derotation. Peroneal / Peritibial nerve or muscle damage. Ankle or Plantar flexion contracture and functional alignment. Can be used to protect the diabetic/ injured ankle & foot. PF Night Splint (Derotation) Features Removable de-rotation bar. Moulded foot casing, aesthetically pleasing and durable. Effective Liner, improved comfort. Highly functional Design, customized degree of dorsiflexion. Double strapping mechanism, better grip. Tynor R O M Knee Brace Prefabricated, custom adjusted R.O.M. Knee Brace controls and restrict flexion/extension of the knee joint through a multi-point joint fixation system to allow a range of motion or immobilization to the knee. Universal design allows it to be used on quite a big range of population and for a multiple orthopedic problems associated with knee joint. Immobilization at any angle Controlled motion between any two angles Quick and easy application and removal. Tynor R O M Knee Brace Features R.O.M. Dial 0 to 120 degree flexion. 0 to 60 degree hyper extention Locking at any
Nathan Goodyear

Creatine and Phosphocreatine: A Review of Their Use in Exercise and Sport - 0 views

www.ncbi.nlm.nih.gov/...PMC1319235

phosphocreatine creatine exercise sport sports athletic performance

shared by Nathan Goodyear on 26 Jun 12 - No Cached
  • Nathan Goodyear on 26 Jun 12
     
    phosphocreatine and athletics.
wheelchairindia9

Functional Knee Support - 0 views

www.wheelchairindia.com/...Tynor-Functional-Knee-Support

Functional Braces Best for: Sports injuries after surgery functional knee braces knee rehabilitation program knee injuries or knee surgery free movement of the knee joint decrease knee pain improve knee stability

shared by wheelchairindia9 on 19 Mar 16 - No Cached
  • wheelchairindia9 on 19 Mar 16
     
    Tynor Functional Knee Support Functional knee Support is an anterior opening device, which offers the advantage of controlled compression around the knee and a rigid lateral support and immobilization. It allows normal flexion and free movement of the knee joint. Anterio Open able Easy application Controlled compression. Perfect lateral splinting. Anatomical design. Tynor Functional Knee Support Features Bi axial heavy duty aluminum hinge Mimics the natural knee joint Ensures full weight bearing. Allows free flexion movement Four way stretchable fabric Controlled and comfortable compression No buckling No vaso constriction Enhanced comfort Open patella design Release patellar pressure Hold the patella in position Can be used for Patellofemoral diseases Wrap design with anterior closing Easy application and removal on swollen or asymmetric knees Easy application and removal for weak or geriatric patients. Allows customized compression Offers flexibility in sizing Ergonomic design Anti tourniquet effect - ensures no constriction to blood flow Better grip of the product to the body. Anatomic construction- Better functionality and Snug fit.
Nathan Goodyear

The nutritional biochemistry of creatine - 0 views

www.jnutbio.com/...abstract

creatine sports performance exercise

shared by Nathan Goodyear on 27 Jan 14 - No Cached
  • Nathan Goodyear on 27 Jan 14
     
    Loading dose of creatine, 20 grams/day, over 5-6 days increases total muscle creatine levels.  This has been shown to improve athletic performance.  The phosphocreatine  in Type II muscle fibers are particularly increased.  This can be maintained at 2 grams/day.
Nathan Goodyear

Athletic performance and vitamin D. - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...19346976

vitamin d sports medicine sports athletes

shared by Nathan Goodyear on 25 Aug 15 - No Cached
  • Nathan Goodyear on 25 Aug 15
     
    Vitamin D therapy in those that are vitamin D deficient will likely see improved performance.  The goal is > 50 ng/ml.
Nathan Goodyear

The effects of creatine supplementation o... [Eur J Appl Physiol. 2004] - PubMed - NCBI - 0 views

www.ncbi.nlm.nih.gov/...14685870

phosphocreatine athletic performance muscle training creatine

shared by Nathan Goodyear on 26 Jun 12 - No Cached
  • Nathan Goodyear on 26 Jun 12
     
    phosphocreatine helps to maintains muscular performance.  This appears to be an early benefit.  The question is does this help in prolonged performance requirements.
Nathan Goodyear

Vitamin D, Mitochondria, and Muscle - 0 views

jcem.endojournals.org/...961.full

vitamin vitamin d vitamins muscle phosphocreatine mitochondria

shared by Nathan Goodyear on 18 Mar 13 - No Cached
  • Nathan Goodyear on 18 Mar 13
     
    editorial discussion of the benefit of vitamin D in mitochondrial function.   Those in the vitamin D repletion arm of the study had a quicker recovery time to restored phospho-creatinine levels.  The quicker the recovery of phospho-creatinine levels, the shorter recovery phase and the likely improvement in athletic performance.
Nathan Goodyear

Sports Health Benefits of Vitamin D - 0 views

www.ncbi.nlm.nih.gov/...PMC3497950

sports medicine sports injury sports vitamin d

shared by Nathan Goodyear on 24 Aug 15 - No Cached
  • Nathan Goodyear on 24 Aug 15
     
    vitamin D and optimal athletic performance.
fitspresso

https://www.fitspresso-co.com/ - 0 views

www.fitspresso-co.com

fitspresso fit spresso us uk buy usa 2023 pros 2022 2024 pills order price weight loss espresso fitespresso review amazon tablet reviews customer supplement does it work

shared by fitspresso on 27 Sep 23 - No Cached
  • fitspresso on 27 Sep 23
     
    FitSpresso™ | Official Site fitspresso-co.com FitSpresso Only $39/Bottle Limited Time Offer! FitSpresso Special Deal + Special 51% Discount Save $660 + 180 Days Money Back Guarantee FitSpresso Herpesyl Five Star A dietary product formulated to assist users in reducing weight can increase other advantages that can support overall health. This product can assist users in getting closer to the desirable body weight. Regular Price: 149/per bottle Only for: $39/per bottle Buy Now What IsFitSpresso? FitSpresso is promoted as a natural supplement that comes in the form of diet pills, and it can aid in rapid and efficient weight loss, similar to many other supplements. The term "natural supplements refers to a nutritional supplement that is made entirely of natural, chemical-free materials. You can utilize these organic ingredients to aid in natural weight loss. It can speed up your body's metabolism and assist with other crucial processes. All parts of our bodies are impacted by weight increase, and not only do we need to deal with the increased weight, but we also need to deal with the numerous problems and illnesses that come along with it. This refers to the risk of developing chronic cardiac conditions, low blood pressure, and, in some circumstances, problems with blood sugar. However, FitSpresso even with its bright and bold claims, can help you efficiently manage your weight and completely avoid these extra uncomfortable problems. FitSpresso is a supplement that comes in the form of a pill, which makes it tasty, simple to swallow, and handy. According to the manufacturer, these diet tablets are GMO-free and toxic-free, making them edible. This is why we have things such as weight loss supplements. Thanks to modern advancements, we can just take a dietary supplement pill to bring about significant weight loss in a completely healthy and natural manner. Not only this, but dietary supplements can also support healthy blood sugar levels and help with
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