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Fluid Balance and Endurance Exercise Performance

Cheuvront Samuel N. PhD; Carter, Robert III PhD; Sawka, Michael N. PhD
Current Sports Medicine Reports: August 2003
Nutrition: PDF Only

Dehydration alters cardiovascular, thermoregulatory, central nervous system, and metabolic functions. One or more of these alterations will degrade endurance exercise performance when dehydration exceeds 2% of body weight. These performance decrements are accentuated by heat stress. To minimize the adverse consequences of body water deficits on endurance exercise performance, it is recommended that fluid intake be sufficient to minimize dehydration to less than 2% of body weight loss. This can usually be achieved with fluid intakes of under 1 L ¥ h-1.

Address: US Army Research Institute of Environmental Medicine, Thermal and Mountain Medicine Division, 42 Kansas Street, Natick, MA 01760-5007, USA. E-mail:

© 2003 American College of Sports Medicine