Energy Metabolism in Cold-Stressed Females: Implications for Predictive Modeling
Annual rept. 1 Oct 97-30 Sep 98
DEFENCE AND CIVIL INST OF ENVIRONMENTALMEDICINE DOWNSVIEW (ONTARIO)
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This document is a progress report which describes the results from the second of a series of studies carried out to clarify the extent of gender-related differences in physiological responses to cold stress, and to evaluate the potential implications for survival time in the cold. Specifically, this study was designed to compare substrate utilization during light LI and moderate MI exercise performed in both cold and comfortable ambient temperatures. The objectives were to quantify M, lipid and carbohydrate oxidation rates, and muscle glycogen utilization during light and moderate exercise in the cold versus comfortable ambient temperatures and to compare these results with those previously collected in males who underwent the same protocol. Two groups of females performed either low or moderate intensity exercise at 9 and 21 deg C. M was significantly higher 13 during exercise in the cold in LI but not MI. In contrast to males, this was not associated with greater muscle glycogen utilization. The relative contribution of carbohydrate, fat, and protein oxidation to fueling M was not different between groups or exposures.
- Medicine and Medical Research
- Stress Physiology