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Related Experiment Videos

Continuous and intermittent personal microclimate cooling strategies

S H Bomalaski1, Y T Chen, S H Constable

  • 1Sustained Operations Branch, Armstrong Laboratory, Brooks AFB, TX 78235-5120, USA.

Aviation, Space, and Environmental Medicine
|August 1, 1995
PubMed
Summary

Continuous cooling significantly improved thermal stress relief for individuals wearing the USAF Chemical Defense Ensemble (CDE) during exercise in warm and hot conditions compared to intermittent cooling or no cooling.

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Area of Science:

  • Environmental Physiology
  • Human Performance
  • Protective Clothing Technology

Background:

  • Wearing the USAF Chemical Defense Ensemble (CDE) can induce significant thermal stress during physical exertion.
  • Personal auxiliary cooling systems are explored to mitigate heat strain in protective ensembles.

Purpose of the Study:

  • To compare the effectiveness of two personal microclimate air cooling methods against a no-cooling control.
  • To evaluate cooling strategies for personnel wearing the CDE in warm and hot environments.

Main Methods:

  • Subjects performed intermittent exercise at 40% VO2max in warm (28/24/34°C) and hot (38/26/43°C) conditions.
  • Two cooling methods were tested: intermittent cooling (IC) during rest and continuous cooling (CC) during work and rest.
  • Physiological (rectal temperature, heart rate, sweat production) and subjective (RPE, thermal comfort) measures were recorded.

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Main Results:

  • Both CC and IC significantly reduced thermal stress compared to no cooling (NC).
  • CC demonstrated superior results over IC, showing lower sweat production, higher sweat evaporation, and improved thermal comfort and perceived exertion.
  • CC also enhanced the ability to maintain thermal equilibrium over time in warm conditions.

Conclusions:

  • Continuous personal microclimate air cooling is a highly effective strategy for managing thermal stress in the CDE.
  • Personal cooling systems can significantly improve wearer tolerance and performance in demanding thermal environments.
  • Subjective improvements in thermal comfort and perceived exertion are critical outcomes of effective cooling strategies.