Abstract
It is well-established that repetition of heat stress exposure has been shown to facilitate adaptations to the heat but these protocols have tended to be of a fixed work intensity, continuous exercise, long-term in duration (>7 days) and use hydration. Secondly, there is limited information on the potential use of heat acclimation as a training method for human performance in thermoneutral conditions. Therefore, the aims of this study were to investigate the effectiveness of short-term heat acclimation (STHA) for 5 days, using the controlled hyperthermia technique with dehydration, on intermittent exercise in thermoneutral and hot environments.
Highlights
It is well-established that repetition of heat stress exposure has been shown to facilitate adaptations to the heat but these protocols have tended to be of a fixed work intensity, continuous exercise, long-term in duration (>7 days) and use hydration
Ten, healthy, active, moderately-trained males (Mean (SD); Age 25.6 (8.9) yrs; Height 180.7 (5.6) cm; Body Mass 83.2 (10.8) kg; V O2 max 45.3 (6.5) mL.kg-1.min-1 and resting cardiac output 6.3 (1.8) L.min-1), participated in a short-term heat acclimation (STHA) programme. This consisted of 90 minutes dehydration heat acclimation for 5 consecutive days (39.5 °C; 60% rh), using the controlled-hyperthermia technique (~rectal temperature [Tre] 38.5 °C) [2]
The EST was repeated in controlled conditions (C; 11 °C 45% rh); pre and post STHA in thermoneutral (TN; 11 °C 45% rh) and hot environments (H; 35 °C 45% rh)
Summary
It is well-established that repetition of heat stress exposure has been shown to facilitate adaptations to the heat but these protocols have tended to be of a fixed work intensity, continuous exercise, long-term in duration (>7 days) and use hydration. There is limited information on the potential use of heat acclimation as a training method for human performance in thermoneutral conditions [1]. The aims of this study were to investigate the effectiveness of short-term heat acclimation (STHA) for 5 days, using the controlledhyperthermia technique with dehydration, on intermittent exercise in thermoneutral and hot environments
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