Assessment of heat tolerance for post exertional heat stroke individuals

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

Research output: Contribution to journalArticlepeer-review


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 re), heart rate (HR), skin temperature and sweat rate (m sw). 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) aud 5 subjects as heat intolerant (HI). The comfort tolerance test was found as irrelevant for heat intolerance assessment. PSI after 60 min (PSI60) was unable to predict PSI after 120 min (PSI120) whereas there was not a high enough correlation between CHSI60 and CHSI120. Conclusions: It was concluded that tolerance to heat must be tested during heat stress and the test duration cannot be shorter than 120 min.

Original languageEnglish
Pages (from-to)CR252-CR257
JournalMedical Science Monitor
Issue number6
StatePublished - Jun 2004


  • Exercise
  • Heat intolerance
  • Hot climate
  • Rectal temperature
  • Strain index


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