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Related Experiment Videos

Fall in skin temperature during exercise.

T Nakayama, Y Ohnuki, K Niwa

    The Japanese Journal of Physiology
    |January 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

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    During physical work, especially in warm environments, skin temperature decreases due to segmental vasoconstriction, not evaporative cooling. This impacts heat loss and internal body temperature regulation.

    Area of Science:

    • Physiology
    • Environmental Medicine
    • Exercise Science

    Background:

    • Skin temperature regulation is crucial during physical activity.
    • Understanding the interplay between work intensity, environment, and thermoregulation is important for occupational health and sports science.

    Purpose of the Study:

    • To investigate the changes in skin temperature during different types of physical work.
    • To determine the underlying mechanisms causing skin temperature fluctuations during exercise.
    • To explore the influence of environmental conditions on these responses.

    Main Methods:

    • Measurements of skin temperature were taken on various body parts (arms, chest, legs, feet) during light and moderate intensity static and dynamic work.
    • Experiments were conducted in both warm and cool environments.

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  • Evaporative cooling and non-thermal reflex mechanisms were considered as potential causes for temperature changes.

    • Main Results:

    • In a warm environment, arm and chest skin temperatures fell during light work, while this was not observed in a cool environment.
    • The decrease in skin temperature was proportional to work intensity and occurred in both static and dynamic work.
    • Leg work caused initial decline and subsequent rise in extremities' skin temperature, with significant drops in inactive areas like the epigastrium.
    • Mean skin temperature remained largely unchanged.
    • The observed fall in skin temperature was attributed to segmental vasoconstriction, likely a spinal reflex from exercising muscles, overriding thermoregulatory vasodilation.

    Conclusions:

    • Non-thermal reflex vasoconstriction significantly influences skin temperature during physical work, particularly in warm conditions.
    • This vasoconstriction reduces heat loss, potentially contributing to the rise in internal body temperature during exercise.
    • The findings highlight a complex thermoregulatory response beyond simple evaporative cooling.