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Temperature regulation during intermittent exercise with progressive dehydration.

J P Libert, V Candas, C Amoros

    The Japanese Journal of Physiology
    |January 1, 1986
    PubMed
    Summary
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    Dehydration significantly impairs the body's ability to regulate temperature during exercise. Rehydration helps lower body temperature but doesn't always restore sweating response, suggesting plasma volume is key.

    Area of Science:

    • Exercise Physiology
    • Environmental Physiology
    • Human Thermoregulation

    Background:

    • Dehydration impacts thermoregulation during prolonged exercise.
    • Understanding the effects of dehydration and rehydration on physiological responses is crucial for athletes and military personnel.

    Purpose of the Study:

    • To investigate the effects of dehydration and subsequent rehydration on temperature regulation during intermittent exercise in a hot environment.
    • To examine the relationship between plasma volume, body temperature, and sweating response.

    Main Methods:

    • Five healthy men performed 4-hour intermittent exercise sessions at 34°C.
    • Dehydration was induced (3% body weight loss), followed by partial rehydration (80% of weight loss).
    • Measurements included rectal (Tre) and mean skin (Tsk) temperatures, body weight loss, chest sweat rate (msw), and blood parameters (plasma volume, osmolality, [Na+], [K+]).

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    Main Results:

    • Dehydration led to decreased plasma volume and increased plasma osmolality, [Na+], and [K+].
    • Rehydration decreased body temperatures but did not consistently increase sweat rate.
    • A reduced sensitivity of the thermoregulatory system was observed with dehydration, indicated by the msw to Tre relationship.

    Conclusions:

    • Dehydration significantly affects thermoregulation, reducing sweating response potentially due to plasma hypovolemia.
    • Rehydration mitigates some effects of dehydration on body temperature but may not fully restore sweating capacity.
    • Thermoregulatory responses vary across body areas during rehydration.