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Related Experiment Videos

Thermoregulatory responses to upper body exercise.

M N Sawka, N A Pimental, K B Pandolf

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1984
    PubMed
    Summary

    Thermoregulatory responses during exercise are independent of muscle mass used. Both absolute and relative intensity exercise showed that body temperature regulation depends on exercise intensity, not the specific muscles worked.

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    Area of Science:

    • Exercise Physiology
    • Human Thermoregulation
    • Sports Science

    Background:

    • Understanding how the body regulates temperature during different exercise types is crucial for optimizing athletic performance and safety.
    • Previous research has explored thermoregulation during lower body exercise, but comparisons with upper body exercise are less common.

    Purpose of the Study:

    • To compare thermoregulatory responses between upper body (arm crank) and lower body (cycle) exercise.
    • To investigate the influence of absolute versus relative exercise intensity on thermoregulation.

    Main Methods:

    • Nine male subjects completed 60-minute arm crank (AC) and cycle (CY) exercise sessions.
    • Exercise was performed at both the same absolute intensity (1.61 L/min oxygen uptake) and same relative intensity (60% peak oxygen uptake).
    • Measurements included rectal temperature, sweating rate, and skin temperatures (chest, back, arm, thigh, calf).

    Main Results:

    • At absolute intensity, rectal temperature and sweating rate were similar between AC and CY; calf skin temperature was lower during AC.
    • At relative intensity, thermoregulatory responses were lower during AC compared to CY.
    • No difference was observed between esophageal and rectal temperatures during AC exercise.

    Conclusions:

    • Thermoregulatory responses during exercise are independent of the amount of skeletal muscle mass utilized.
    • The primary determinant of thermoregulatory responses appears to be the absolute metabolic intensity of the exercise.

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