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eISSN: 1643-3750

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Assessment of heat tolerance for post exertional heat stroke individuals

Daniel S. Moran, Yuval Heled, Lawrence Still, Arie Laor, Yair Shapiro

Med Sci Monit 2004; 10(6): CR252-257

ID: 11681


Background:The aim of this study was to evaluate the heat tolerance test, which was performed by individuals with high risk for heat injuries, for exposure duration and climatic conditions.Material/Methods: Nineteen young (19±1 yr) post heat stroke males performed 2 separate tolerance tests consisting of identical treadmill walking (5km·h–1, 2% grade) for 120 min during hot (40°C, 40%RH) and comfort (20°C, 50%RH) climate conditions. Physiological monitoring included rectal temperature (T[sub]re[/sub]), heart rate (HR), skin temperature and sweat rate (m[sub]sw[/sub]). Concomitantly, strain evaluation was assessed by the physiological strain index (PSI) and the cumulative heat strain index (CHSI).Results: 14 subjects were categorized as heat tolerant (HT) and 5 subjects as heat intolerant (HI). The comfort tolerance test was found as irrelevant for heat intolerance assessment. PSI after 60 min (PSI[sub]60[/sub]) was unable to predict PSI after 120 min (PSI[sub]120[/sub]) whereas there was not a high enough correlation between CHSI[sub]60[/sub] and CHSI[sub]120[/sub].
Conclusions: It was concluded that tolerance to heat must be tested during heat stress and the test duration cannot be shorter than 120 min.

This paper has been published under Creative Common Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) allowing to download articles and share them with others as long as they credit the authors and the publisher, but without permission to change them in any way or use them commercially.
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