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Human heat tolerance in simulated environment

P K Nag1, S P Ashtekar, A Nag

  • 1Ergonomics Division, National Institute of Occupational Health, Ahmedabad.

The Indian Journal of Medical Research
|May 1, 1997
PubMed
Summary
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Human heat tolerance was studied in extreme conditions. Volunteers experienced unacceptable physiological responses above 35.4 degrees C effective temperature-basic (ET(B)), indicating critical heat stress limits.

Area of Science:

  • Environmental Physiology
  • Human Heat Tolerance
  • Occupational Health

Background:

  • Understanding human physiological responses to heat is crucial for setting safe exposure limits.
  • Previous research has utilized various heat stress indices, but direct comparisons under ergometric conditions are needed.

Purpose of the Study:

  • To determine the heat tolerance limits of male volunteers performing moderate ergometric work.
  • To compare different heat stress indices, including effective temperature-basic (ET(B)), WBGT, and Oxford Index.
  • To establish acceptable and tolerable exposure limits for humans in hot environments.

Main Methods:

  • Eleven male volunteers were exposed to seven different climatic conditions in a climatic chamber.
  • Subjects performed ergometric work at 60% VO2max.

Related Experiment Videos

  • Exposure duration was determined by cardiorespiratory, body temperature (Tcr), and sweating responses.

    • Main Results:

    • Tolerance limits were reached at body core temperatures (Tcr) >39°C and heart rates of 172-182 bpm.
    • Significant variations in oxygen demand correlated with environmental warmth and tolerance time.
    • Unacceptable physiological and psychophysical reactions occurred beyond 35.4°C ET(B).

    Conclusions:

    • Acceptable heat exposure is suggested at 38-38.2°C Tcr for 80-85 min.
    • A tolerable limit for short durations (40-45 min) was identified at 39°C Tcr, corresponding to 31.5-36.5°C ET(B).
    • Volunteers showed no inherent heat susceptibility, with issues arising only in extreme heat conditions.