Food Deprivation and Exercise in the Heat: Thermoregulatory and Metabolic Effects,
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
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To determine the effects of food deprivation on the physical, physiological, and metabolic responses to exercise in the heat, adult, male rats were food-deprived for 24, 48, or 72 h. They were then exercised in the heat to hyperthermic exhaustion. Food deprivation had no effects on endurance, but ad lib fed controls manifested significantly p 0.05 increased Tco and Tsk during the latter portion of the treadmill interval. Food deprivation resulted in severe hypoglycemia following exercise P 0.01, and these decrements were accompanied by marked p 0.01 reductions in circulating insulin levels. Prolonged food deprivation 48 and 72h resulted in significant p 0.01 hypertriglyceridemia and hyperlactacidemia subsequent p 0.01 hypertriglyceridemia and hyperlactacidemia subsequent to exercise. Levels of sodium, potassium, urea nitrogen, and creatine phosphokiinase were unaffected by the food deprivatiion intervals. We have concluded from these studies that while thermoregulatory and metaboilic responses to exercise in the hear can be significantly affected by food deprivation, short-term endurance capacity was unaltered.
- Stress Physiology