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.
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Accepted: 12 November 1997
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Cheung, S., McLellan, T. Influence of short-term aerobic training and hydration status on tolerance during uncompensable heat stress. Eur J Appl Physiol 78, 50–58 (1998). https://doi.org/10.1007/s004210050386
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DOI: https://doi.org/10.1007/s004210050386