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Heat balance during exercise in the sun.

B Nielsen¹, K Kassow, F E Aschengreen

¹August Krogh Institute, University of Copenhagen, Denmark.

European Journal of Applied Physiology and Occupational Physiology

|January 1, 1988

Summary

Human heat balance during exercise is affected by solar radiation. Reduced radiant heat gain in shade is offset by decreased sweat evaporation, demonstrating physiological adaptation to environmental heat stress.

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Area of Science:

Environmental Physiology
Human Exercise Physiology

Background:

Understanding human thermoregulation during exercise in varying solar radiation is crucial for heat stress management.
Previous research has explored heat balance during exercise, but specific impacts of direct solar radiation require further elucidation.

Purpose of the Study:

To quantify the components of the human heat balance equation during prolonged exercise under direct solar radiation and shade.
To investigate the physiological responses to intermittent solar radiation exposure during cycling.

Main Methods:

Partitional calorimetry was employed to measure heat exchange in 10 male subjects exercising at 92 W on a bicycle ergometer.
Subjects were exposed to alternating periods of direct sun and shade for 120 minutes, with variations in body orientation relative to the sun.

Main Results:

Direct solar radiation contributed approximately 100 W to the heat gain.
During the shade period, a reduction in radiant heat gain was observed.
This decrease in radiant heat gain was compensated by a reduction in evaporative sweat loss, indicating physiological adjustment.

Conclusions:

Human evaporative heat loss significantly adjusts to changes in radiant heat load during exercise.
The body effectively modulates sweat evaporation to maintain thermal balance when solar radiation exposure is altered.

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