Physiological Responses of Men and Women to Prolonged Dry Heat Exposure,
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
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Heat-acclimated men n10 and women n9 were exposed to hot-dry conditions 49 C, 20 rh for 4 hours to determine the effect of prolonged work in the heat on physiological differences between sexes. Hourly exposures consisted of 10 min resting and 50 min walking at 1.34 ms metabolic rate 195 and 170 Wm sq for men and women respectively. No significant difference in rectal temperature Tre was found between the sexes for each hour h of exposure. Heart rate HR of women, however, averaged 10-17 beatsmin higher than men. Mean skin temperature Tsk was also significantly higher in women throughout the exposure. For both sexes, the 4th-h Tre, Hr and Tsk were significantly higher than the preceeding 3 h. No differences in total sweat rate or sweat sensitivity were evident. It was concluded that a prolonged exposure to dry heat does not accentuate physiological differences between the sexes b women are able to secrete sweat at rates comparable to men over a 4-h period and c 2-h acclimation sessions do not necessarily acclimate individuals for work of longer duration.
- Anatomy and Physiology
- Stress Physiology