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A new occupational heat tolerance test: A feasibility study.

Emily R Watkins1, Jemma Gibbons1, Yanoula Dellas1

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Summary
This summary is machine-generated.

A new heat occupational tolerance test (HOTT) accurately assesses heat illness risk in protective clothing. This faster, more reliable test allows for individual comparisons, improving heat stress management for workers.

Keywords:
Heat toleranceOccupational healthPersonal protective equipmentReliabilityValidity

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Area of Science:

  • Occupational Health and Safety
  • Environmental Physiology
  • Heat Stress Research

Background:

  • Current heat tolerance tests do not accurately simulate occupational heat strain environments.
  • Existing tests are lengthy (up to 2 hours) and lack the ability for individual comparisons due to fixed exercise intensity.
  • There is a need for a more realistic and efficient method to assess heat tolerance, especially for individuals wearing protective clothing.

Purpose of the Study:

  • To evaluate the validity and reliability of a novel heat occupational tolerance test (HOTT).
  • To compare the HOTT against the standard heat tolerance test (HTT) under controlled conditions.
  • To establish HOTT's utility in assessing heat tolerance in protective gear.

Main Methods:

  • Developed the Heat Occupational Tolerance Test (HOTT): 40-minute protocol at 6 W·kg⁻¹ metabolic heat production, 50°C/10% RH, while wearing protective clothing.
  • Compared HOTT to the standard Heat Tolerance Test (HTT): 2-hour walk at 5 km·h⁻¹ with 1% gradient, 40°C/40% RH, in minimal clothing.
  • Eighteen participants completed multiple trials to assess validity (HOTT vs. HTT) and reliability (repeated HOTT trials).

Main Results:

  • Peak rectal temperature (Tre) showed strong agreement (0.19°C error) between HOTT (38.6±0.4°C) and HTT (38.7±0.4°C), confirming validity.
  • HOTT demonstrated high reliability, with repeated trials showing strong agreement for peak Tre (38.5±0.4°C vs. 38.5±0.4°C) and peak heart rate (182±20 vs. 182±21 bpm).
  • The HOTT successfully assessed physiological and perceptual responses in a simulated occupational heat environment.

Conclusions:

  • The HOTT is a valid and reliable heat tolerance assessment tool, particularly for individuals in protective clothing.
  • It offers a significantly reduced testing time compared to traditional methods.
  • HOTT enables consistent individual monitoring and inter-individual comparisons, enhancing occupational heat stress management strategies.