Influence of short-term aerobic training and hydration status on tolerance during uncompensable heat stress |
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Authors: | Stephen S Cheung and Tom M McLellan |
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Affiliation: | (1) Defence and Civil Institute of Environmental Medicine, Human Protection and Performance Section, PO Box 2000, Toronto, Ont. M3M-3B9, Canada, CA;(2) Graduate Department of Community Health, University of Toronto, Toronto, Ont. M5S-1A8, Canada, CA |
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Abstract: | The purpose of the present study was to determine the separate and combined effects of a short-term aerobic training program
and hypohydration on tolerance during light exercise while wearing nuclear, biological, and chemical protective clothing in
the heat (40°C, 30% relative humidity). Males of moderate fitness <50 ml · kg−1 · min−1 maximal O2 consumption (V˙O2
max
)] were tested while euhydrated or hypohydrated by ≈2% of body weight through exercise and fluid restriction the day preceding
the trials. Tests were conducted before and after either a 2-week program of daily aerobic training (1 h treadmill exercise
at 65% V˙O2
max
for 12 days; n = 8) or a control period (n = 7), which had no effect on any measured variable. The training increased V˙O2
max
by 6.5%, while heart rate (f
c) and the rectal temperature (T
re) rise decreased during exercise in a thermoneutral environment. In the heat, training resulted in a decreased skin temperature
and increased sweat rate, but did not affect f
c, T
re or tolerance time (TT). In both training and control groups, hypohydration significantly increased T
re and f
c and decreased the TT. It was concluded that the short-term aerobic training program had no benefit on exercise-heat tolerance
in this uncompensable heat stress environment.
Accepted: 12 November 1997 |
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Keywords: | Heat exhaustion Temperature regulation Hypohydration NBC clothing Physical fitness |
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