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The heat stress compensability classification (HSCC) applied within the United States: model update and code

Gisel Guzman-Echavarria1, Ariane Middel1,2, Daniel J Vecellio3

  • 1School of Geographical Sciences and Urban Planning, Arizona State University, Tempe, AZ, USA.

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Summary

The updated Heat Stress Compensability Classification (HSCC) model better reflects human physiological limits to sweating. This enhanced model improves accuracy for assessing uncompensable heat stress (UHS) in various populations and climates.

Keywords:
Biophysical heat-exchange modelClimate classificationExtreme heatHeat stress compensability classification (HSCC)Mean radiant temperatureUncompensable heat stress

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Area of Science:

  • Physiology
  • Environmental Health
  • Climate Science

Background:

  • Uncompensable heat stress (UHS) poses risks to human health, particularly in hot climates.
  • The Heat Stress Compensability Classification (HSCC) system categorizes UHS based on heat exchange principles.
  • Previous HSCC models did not fully account for physiological sweating limitations.

Purpose of the Study:

  • To update the HSCC model by incorporating the maximum whole-body sweat rate (SRmax).
  • To enhance the physiological realism of UHS categorization.
  • To provide accessible tools for climate-health research.

Main Methods:

  • Physiology-based modeling of human heat exchange.
  • Incorporation of SRmax to constrain maximum evaporative heat loss.
  • Tutorial and publicly available code for HSCC application.

Main Results:

  • Model adjustments resulted in minor changes for healthy young adults, with no shifts between HSCC categories.
  • The addition of SRmax slightly altered the dry heat load assessment.
  • The updated model's significance increases for older adults, individuals with sweating restrictions, and hotter climates.

Conclusions:

  • The updated HSCC model offers enhanced physiological realism for UHS assessment.
  • Publicly available code increases accessibility for climate-health research and policy.
  • The refined HSCC supports more impactful and collaborative research on heat stress impacts.