Effect of primary hypohydration on physical work capacity

Pichan, G.; Gauttam, R. K.; Tomar, O. S.; Bajaj, Amir Chand

doi:10.1007/bf01045276

Cited by 29 publications

(14 citation statements)

References 22 publications

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“…13 26 Clearly the findings from this study are incompatible with that prediction, as the 6-10% weight loss that we measured should have impaired performance by 70-125%, if the data of Craig and Cummings 26 are extrapolated, or by 58-110%, if the data of Pinchan et al 27 …”

Section: Discussionmentioning

confidence: 75%

Weight changes, medical complications, and performance during an Ironman triathlon

Sharwood

Collins²,

Goedecke³

et al. 2004

Br J Sports Med

144

109

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Background: Subjects exercising without fluid ingestion in desert heat terminated exercise when the total loss in body weight exceeded 7%. It is not known if athletes competing in cooler conditions with free access to fluid terminate exercise at similar levels of weight loss. Objectives: To determine any associations between percentage weight losses during a 224 km Ironman triathlon, serum sodium concentrations and rectal temperatures after the race, and prevalence of medical diagnoses. Methods: Athletes competing in the 2000 and 2001 South African Ironman triathlon were weighed on the day of registration and again immediately before and immediately after the race. Blood pressure and serum sodium concentrations were measured at registration and immediately after the race. Rectal temperatures were also measured after the race, at which time all athletes were medically examined. Athletes were assigned to one of three groups according to percentage weight loss during the race. Results: Body weight was significantly (p,0.0001) reduced after the race in all three groups. Serum sodium concentrations were significantly (p,0.001) higher in athletes with the greatest percentage weight loss. Rectal temperatures were the same in all groups, with only a weak inverse association between temperature and percentage weight loss. There were no significant differences in diagnostic indices of high weight loss or incidence of medical diagnoses between groups. Conclusions: Large changes in body weight during a triathlon were not associated with a greater prevalence of medical complications or higher rectal temperatures but were associated with higher serum sodium concentrations.

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Section: Discussionmentioning

confidence: 75%

Weight changes, medical complications, and performance during an Ironman triathlon

Sharwood

Collins²,

Goedecke³

et al. 2004

Br J Sports Med

144

109

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show abstract

“…49,52 The goal should be to lose no more than 2% to 3% of body weight during the practice session (due to sweat and urine losses). [78][79][80][81][82] 13. Minimize the amount of equipment and clothing worn by the athlete in hot or humid (or both) conditions.…”

mentioning

confidence: 99%

National Athletic Trainers' Association Position Statement: Exertional Heat Illnesses

Casa¹,

DeMartini²,

Bergeron³

et al. 2015

Journal of Athletic Training

168

338

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Objective: To present recommendations for the prevention, recognition, and treatment of exertional heat illnesses and to describe the relevant physiology of thermoregulation.Background: Certified athletic trainers evaluate and treat heat-related injuries during athletic activity in ''safe'' and highrisk environments. While the recognition of heat illness has improved, the subtle signs and symptoms associated with heat illness are often overlooked, resulting in more serious problems for affected athletes. The recommendations presented here provide athletic trainers and allied health providers with an integrated scientific and practical approach to the prevention, recognition, and treatment of heat illnesses. These recommendations can be modified based on the environmental conditions of the site, the specific sport, and individual considerations to maximize safety and performance.Recommendations: Certified athletic trainers and other allied health providers should use these recommendations to establish on-site emergency plans for their venues and athletes. The primary goal of athlete safety is addressed through the prevention and recognition of heat-related illnesses and a welldeveloped plan to evaluate and treat affected athletes. Even with a heat-illness prevention plan that includes medical screening, acclimatization, conditioning, environmental monitoring, and suitable practice adjustments, heat illness can and does occur. Athletic trainers and other allied health providers must be prepared to respond in an expedient manner to alleviate symptoms and minimize morbidity and mortality.Key Words: heat cramps, heat syncope, heat exhaustion, heat stroke, hyponatremia, dehydration, exercise, heat tolerance H eat illness is inherent to physical activity and its incidence increases with rising ambient temperature and relative humidity. Athletes who begin training in the late summer (eg, football, soccer, and cross-country athletes) experience exertional heat-related illness more often than athletes who begin training during the winter and spring. [1][2][3][4][5] Although the hot conditions associated with late summer provide a simple explanation for this difference, we need to understand what makes certain athletes more susceptible and how these illnesses can be prevented. PURPOSEThis position statement provides recommendations that will enable certified athletic trainers (ATCs) and other allied health providers to (1) identify and implement preventive strategies that can reduce heat-related illnesses in sports, (2) characterize factors associated with the early detection of heat illness, (3) provide on-site first aid and emergency management of athletes with heat illnesses, (4) determine appropriate return-toplay procedures, (5) understand thermoregulation and physiologic responses to heat, and (6) recognize groups with special concerns related to heat exposure. ORGANIZATIONThis position statement is organized as follows:1. Definitions of exertional heat illnesses, including exerciseassociated muscle (heat) cramps, he...

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“…o 2max. decrement or physical exercise capacity decrement during heat exposure (Craig & Cummings 1966;Pinchan et al 1988). Clearly, hypohydration results in larger decrements of physical exercise capacity in hot than in temperate climates (Armstrong et al 1985a).…”

Section: Exercise Performance and Temperature Regulationmentioning

confidence: 99%

“…, fromCraig and Cummings (1966); ᭹, fromPinchan et al (1988). decrement, and (b) physical exercise capacity decrement during heat exposure.…”

mentioning

confidence: 99%

Effects of Dehydration and Rehydration on Performance

Sawka¹,

Latzka²,

Montain³

2000

Nutrition in Sport

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Effect of primary hypohydration on physical work capacity

Cited by 29 publications

References 22 publications

Weight changes, medical complications, and performance during an Ironman triathlon

Weight changes, medical complications, and performance during an Ironman triathlon

National Athletic Trainers' Association Position Statement: Exertional Heat Illnesses

Effects of Dehydration and Rehydration on Performance

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