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Related Experiment Videos

Rapid cooling techniques in joggers experiencing heat strain.

A J Clapp1, P A Bishop, I Muir

  • 1Department of HPER, South Dakota State University, Brookings, USA.

Journal of Science and Medicine in Sport
|September 11, 2001
PubMed
Summary

Cooling the torso in cool water is the fastest way to reduce high body temperature after heat strain. This method significantly lowers core temperature faster than other cooling techniques.

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Area of Science:

  • Environmental Physiology
  • Sports Medicine
  • Thermoregulation

Background:

  • Heat strain increases morbidity and mortality risk due to prolonged elevated core body temperature.
  • Effective cooling techniques are crucial for mitigating heat injury after exercise in hot environments.

Purpose of the Study:

  • To evaluate and compare the efficacy of three different core cooling treatments following exercise-induced heat strain.
  • To determine the most rapid and effective method for reducing elevated core body temperature.

Main Methods:

  • Subjects (n=5) exercised in a heated environment (WBGT = 39°C) until heat strain occurred.
  • Three cooling treatments were applied in random order: torso immersion in cool water, hands and feet immersion in cool water, and sitting in shade with a breeze.

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  • Rectal temperature and heart rate were monitored during cooling.

    • Main Results:

    • Torso immersion resulted in a significantly faster rate of rectal temperature decline (0.25°C/min) compared to hands/feet immersion (0.16°C/min) and shade cooling (0.11°C/min).
    • Differences in cooling effectiveness were apparent within 10 minutes.
    • While not statistically significant, heart rate also showed a trend towards faster normalization with torso immersion.

    Conclusions:

    • Cool water torso immersion is a highly effective and rapid method for reducing core body temperature after heat strain.
    • This technique offers a significant advantage in lowering core temperature compared to other evaluated methods.