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Related Experiment Videos

Micro-environment changes inside impermeable protective clothing during a continuous work exposure.

I H Muir1, P A Bishop, J Kozusko

  • 1Department of Human Performance Studies, University of Alabama, Tuscaloosa 35487, USA. ian.muir@nike.com

Ergonomics
|November 6, 2001
PubMed
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Wearing protective clothing (PC) creates a hotter micro-environment, increasing heat stress for workers. An adjustment factor of 5°C WBGT is suggested for up to 1 hour of work in hot conditions.

Area of Science:

  • Occupational Health and Safety
  • Environmental Physiology
  • Human Factors Engineering

Background:

  • Protective clothing (PC) creates a micro-environment that elevates heat stress beyond ambient conditions.
  • Predictive models for heat strain often adjust ambient conditions to account for this micro-environment.
  • Understanding the thermal load within PC is crucial for worker safety and productivity.

Purpose of the Study:

  • To measure the actual micro-environment temperature and humidity within impermeable protective clothing.
  • To assess the heat strain experienced by subjects during a standardized work protocol.
  • To determine appropriate adjustment factors for ambient temperature to predict thermal stress accurately.

Main Methods:

  • 15 subjects performed a continuous work protocol (300 kcal/h) in impermeable PC.

Related Experiment Videos

  • Micro-environment temperature and humidity were measured using remote sensors at shoulder, hip, and thigh levels.
  • Ambient conditions were maintained at 30.1°C WBGT.

    • Main Results:

    • Micro-environment temperature and humidity showed no significant difference between body sites.
    • The mean micro-environmental WBGT at the end of the work period was 34.6°C WBGT.
    • Micro-environment WBGT increased rapidly in the first 20 minutes, then slowed significantly.

    Conclusions:

    • A 5°C WBGT adjustment factor is recommended for predicting thermal stress in PC for up to 1 hour of moderate work at 30.1°C WBGT.
    • Shorter work durations may require smaller adjustment factors.
    • Accurate micro-environment measurement is key to effective heat stress management in protective clothing.