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Thermogenic control during exercise in a cold environment.

S I Hong, E R Nadel

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |November 1, 1979
    PubMed
    Summary
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    Exercise intensity suppresses shivering, the body's involuntary response to cold. This study found that voluntary exercise centrally inhibits shivering, not due to muscle activity itself.

    Area of Science:

    • Human Physiology
    • Thermoregulation
    • Exercise Science

    Background:

    • Shivering is a key involuntary thermoregulatory response to cold exposure.
    • The impact of voluntary exercise on involuntary shivering is not fully understood.

    Purpose of the Study:

    • To investigate if voluntary exercise contractions interfere with involuntary shivering contractions.
    • To determine the origin of shivering inhibition during exercise.

    Main Methods:

    • Four male subjects were exposed to a 10°C environment.
    • Measurements included esophageal temperature, skin temperatures, oxygen uptake, and neck muscle EMG.
    • Subjects underwent rest followed by either rest or cycling exercise at varying loads.

    Main Results:

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    • Exercise caused a decrease in esophageal temperature, proportional to exercise intensity.
    • Thermoregulatory oxygen uptake and EMG activity were inversely related to temperature.
    • Increasing exercise intensity significantly suppressed the relationship between thermoregulatory oxygen uptake/EMG and esophageal temperature.

    Conclusions:

    • Voluntary exercise centrally inhibits shivering.
    • The inhibition is not caused by the rhythmic contractions of exercise but originates centrally.
    • Exercise intensity modulates the degree of shivering suppression.