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Related Experiment Video

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A Preclinical Model of Exertional Heat Stroke in Mice

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Evaluation of 2 Heat-Mitigation Methods in Army Trainees.

JoEllen M Sefton¹, J S McAdam¹, David D Pascoe¹

¹Warrior Research Center, School of Kinesiology, Auburn University, AL.

Journal of Athletic Training

|October 7, 2016

Summary

Mist fans and cooling towels did not lower core body temperature in a humid environment. While mist fans improved perceived coolness, core temperature continued to rise, potentially increasing heat illness risk.

Keywords:

environmental conditions heat illnesses injury prevention military

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Area of Science:

Environmental Physiology
Exercise Science
Heat Stress Management

Background:

Heat injury poses a significant risk to military trainees, necessitating effective heat mitigation strategies.
Mist fans are employed in hot and humid climates, such as Fort Benning, Georgia, as a heat mitigation method.

Purpose of the Study:

To evaluate the efficacy of mist fans and cooling towels in reducing core body temperature in a humid environment.
To assess any additional physiological or safety benefits or detriments associated with mist fan and cooling towel use.

Main Methods:

A randomized controlled clinical trial was conducted in a laboratory environmental chamber.
Thirty-five physically active men (aged 19-35) participated, undergoing 20-minute interventions: mist fan, cooling towel, or passive control.
Measurements included rectal core temperature, heart rate, blood pressure, and thermal comfort.

Main Results:

Core body temperature increased in all groups during the 20-minute cooling period, with no significant difference among conditions.
Heart rate and blood pressure did not differ significantly across the mist fan, cooling towel, and control groups.
Perceived temperature decreased significantly with cooling interventions, particularly with the mist fan, despite elevated core temperatures.

Conclusions:

Neither mist fans nor cooling towels effectively lowered core body temperature in the studied humid conditions.
Core temperature continued to rise post-exercise in all participants, irrespective of the cooling method used.
Mist fans may create a false sense of cooling, potentially masking dangerous core temperature increases and elevating heat illness risk.