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 330-360 g, N16group were food-deprived for 24, 48, or 72h. They were then exercised 9.14mmin in the heat 35.5 deg C to hyperthermic exhaustion Tco approx. 43 deg C. Food deprivation had no effects on endurance, but ad lib fed controls manifested significantly P or .05 increased Tco and Tsk during the latter portion of the treadmill interval. Prolonged food deprivation 48 and 772h resulted in significant P or .01 hypertriglyceridemia and hyperlactacidemia subsequent to exercise. Levels of sodium, potassium, urea nitrogen, and creatine phosphokinase were unaffected by the food deprivation intervals. We have concluded from these studies that while several thermoregulatory and metabolic responses to exercise in the heat can be significantly affected by food deprivation, short-term endurance capacity was unaltered.
- Stress Physiology