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Increase in sweating sensitivity by endurance conditioning in man.

R Henane, R Flandrois, J P Charbonnier

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |November 1, 1977
    PubMed
    Summary
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    Endurance training significantly improves sweating sensitivity and heat tolerance, even in temperate climates. This enhanced thermoregulation in athletes suggests training can mimic heat acclimatization benefits.

    Area of Science:

    • Exercise Physiology
    • Environmental Physiology
    • Thermoregulation

    Background:

    • Competitive athletes demonstrate higher sweating sensitivity than sedentary individuals.
    • Heat acclimatization is crucial for performance and safety in hot environments.
    • The impact of endurance training in non-heat conditions on thermoregulation requires further investigation.

    Purpose of the Study:

    • To assess the effect of endurance training on sweating sensitivity.
    • To compare the thermoregulatory responses of athletes and untrained individuals.
    • To investigate if endurance training in temperate climates can induce heat acclimatization.

    Main Methods:

    • Evaluated sweating sensitivity at rest in competitive athletes (skiers, swimmers).
    • Monitored changes in sweating sensitivity and maximal oxygen uptake (Vo2max) in sedentary men before and after 3 months of endurance training.

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  • Measured rectal temperature (Tre) and body heat storage during passive heating.

    • Main Results:

    • Athletes exhibited higher sweat output than sedentary men.
    • Endurance training increased Vo2max by 18% in sedentary men.
    • Training led to increased sweating sensitivity, reduced body heat storage, a lower sweat onset Tre, and increased sweating gain constants.

    Conclusions:

    • Endurance training, even in temperate conditions, enhances thermoregulatory function.
    • Increased Vo2max through training may contribute to heat acclimatization.
    • Thermoregulatory adaptations from endurance training resemble those from heat exposure.