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A physiological strain index to evaluate heat stress

D S Moran1, A Shitzer, K B Pandolf

  • 1United States Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760-5007, USA.

The American Journal of Physiology
|August 5, 1998
PubMed
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A new Physiological Strain Index (PSI) uses rectal temperature and heart rate to quantify heat strain. This validated index can help assess physiological strain in various heat conditions.

Area of Science:

  • Physiology
  • Environmental Health
  • Sports Science

Background:

  • Heat strain poses significant physiological risks during exercise.
  • Accurate online monitoring of heat strain is crucial for preventing heat-related illnesses.
  • Existing methods for assessing heat strain may lack comprehensive online capabilities.

Purpose of the Study:

  • To develop and validate a Physiological Strain Index (PSI) for online heat strain assessment.
  • To establish a universal scale for rating physiological strain.
  • To analyze existing databases for heat strain research.

Main Methods:

  • Developed a PSI formula incorporating rectal temperature (Tre) and heart rate (HR).
  • Assigned weight functions to Tre and HR based on assumed maximal physiological responses.

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  • Applied the PSI to data from 100 men exercising in heat and validated against a separate database of 7 men in diverse conditions.

    • Main Results:

    • The PSI effectively rates physiological strain on a 0-10 scale.
    • PSI differentiated significantly between hot-dry and hot-wet environmental conditions (P < 0.05).
    • The index demonstrated potential for broad application in heat strain research.

    Conclusions:

    • The developed PSI provides a reliable method for online heat strain indication.
    • The index shows promise for universal application across different populations and conditions.
    • Further validation with women and diverse age groups is recommended.