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Evaluating physiological strain during cold exposure using a new cold strain index.

D S Moran1, J W Castellani, C O'Brien

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

The American Journal of Physiology
|August 13, 1999
PubMed
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A new Cold Strain Index (CSI) quantifies cold strain using core and skin temperatures in real time. This validated index effectively differentiates and categorizes physiological strain across various cold exposure scenarios.

Area of Science:

  • Physiology
  • Environmental Health
  • Sports Science

Background:

  • Assessing cold strain is crucial for occupational safety and performance in cold environments.
  • Existing methods for quantifying cold strain lack real-time capabilities and universal applicability.
  • Core (Tcore) and mean skin temperatures (Tsk) are key physiological indicators of thermal stress.

Purpose of the Study:

  • To develop and validate a novel Cold Strain Index (CSI) for real-time assessment of physiological strain.
  • To establish a universal scale for quantifying cold strain based on core and mean skin temperatures.
  • To evaluate the CSI's effectiveness in analyzing existing cold exposure databases.

Main Methods:

  • Developed the CSI formula incorporating changes in core and mean skin temperatures over time.

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  • Applied the CSI to three distinct databases involving controlled cold air exposure and water immersion.
  • Utilized statistical analysis to determine the CSI's ability to differentiate between conditions and individual responses.

    • Main Results:

    • The CSI successfully differentiated between various cold exposure conditions (P < 0.01) in two out of three applied databases.
    • The index demonstrated the capability to individually categorize the level of cold strain experienced by subjects.
    • The CSI provides a universal scale (0-10) for quantifying cold strain.

    Conclusions:

    • The developed Cold Strain Index (CSI) is a reliable tool for real-time cold strain assessment.
    • The CSI has the potential for widespread adoption and universal application in diverse cold environments.
    • This index aids in understanding and managing physiological responses to cold exposure.