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Repeatability of a running heat tolerance test.

Jessica A Mee1, Jo Doust1, Neil S Maxwell1

  • 1Exercise in Extreme Environments Research Group, University of Brighton, Welkin Human Performance Laboratories, Denton Road, Eastbourne BN20 7SR, UK.

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A new running heat tolerance test (RHTT) is repeatable for assessing exercise heat stress. This practical test accurately measures physiological responses, aiding in evaluating heat acclimatization strategies.

Keywords:
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Area of Science:

  • Exercise Physiology
  • Environmental Health
  • Sports Science

Background:

  • Current heat tolerance tests (HTT) lack standardization, particularly for running, potentially misdiagnosing heat stress susceptibility.
  • Variability in exercise intensity across existing HTTs can lead to inaccurate assessments of an individual's response to heat.

Purpose of the Study:

  • To establish the repeatability of a practical running-based heat tolerance test (RHTT).
  • To evaluate an individual's ability to tolerate exercise-induced heat stress using a standardized running protocol.

Main Methods:

  • Sixteen participants (8 male, 8 female) completed the RHTT (30 min, 9 km/h, 2% incline) twice in a hot environment (40°C, 40% RH).
  • Key physiological markers including rectal temperature, skin temperature, heart rate, and sweat rate were measured during both trials.

Main Results:

  • No significant differences were found between the two RHTT trials for peak rectal temperature (ICC=0.93), peak skin temperature (ICC=0.79), peak heart rate (ICC=0.99), or sweat rate (ICC=0.95).
  • Low within-participant variability was indicated by small typical error of measure (TEM) values for all measured parameters.
  • The RHTT demonstrated effectiveness in differentiating individual physiological responses to heat stress.

Conclusions:

  • The running heat tolerance test (RHTT) is a repeatable and reliable measure of physiological strain during exercise in the heat.
  • The RHTT can be utilized to assess the efficacy of interventions aimed at alleviating heat stress, both acutely and chronically.
  • Findings support the RHTT's utility in establishing a heat tolerance continuum for individuals.