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Heat-related Cardiac Strain Index (HRCSI) Calculator

  • Air Temperature (°C)
  • Relative Humidity (%)
  • Direct Sun Exposure
  • Work Intensity (METs) Examples: 2 = light standing tasks; 3.5 = brisk walking; 6 = shoveling; 8 = carrying loads uphill.
  • Acclimatized to Heat?
  • [Optional] Research-Grade Physiological Strain Index (PSI)
    Enter values if available.
  • Baseline Core Temp Tre0 (°C)
  • Current Core Temp Tre (°C)
  • Baseline Heart Rate HR0 (bpm)
  • Current Heart Rate HR (bpm)
  • Heat-related Cardiac Strain Index (HRCSI): Explanation and Clinical Context
     This calculator estimates cardiovascular strain due to heat by integrating environmental and workload factors into a 0–10 scale. Higher values indicate elevated cardiac stress and risk of heat-related symptoms or cardiovascular drift. The HRCSI combines an adjusted Heat Index (environmental burden) with metabolic workload (METs) and modifies for acclimatization.

    References:
    Moran DS, Shitzer A, Pandolf KB. Am J Physiol. 1998;275:R129–R134.
    Lloyd A, et al. J Appl Physiol. 2022;132:xxx–xxx.
    Epstein Y, Moran DS. Ind Health. 2006;44:388–398.
    NOAA/NWS Heat Index regression model.
    ISO 7243:2017; ACGIH TLV for Heat Stress and Strain.

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Appcardio may contain errors. Always verify the calculation and its accuracy before clinical use.