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Related Experiment Videos

Local sweating and cutaneous blood flow during exercise in hypobaric environments.

M A Kolka, L A Stephenson, P B Rock

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |June 1, 1987
    PubMed
    Summary

    Hypobaric hypoxia did not alter sweating or skin blood flow thresholds in men and women. However, reduced sweating and skin blood flow sensitivity occurred at higher altitudes during exercise.

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    Area of Science:

    • Environmental Physiology
    • Exercise Physiology
    • Altitude Medicine

    Background:

    • Hypobaric hypoxia, a condition of reduced oxygen availability at high altitudes, can impact physiological responses during exercise.
    • Understanding thermoregulation, including sweating and cutaneous blood flow, is crucial for acclimatization and performance at altitude.

    Purpose of the Study:

    • To investigate the effects of acute hypobaric hypoxia on local sweating and cutaneous blood flow during exercise.
    • To determine if gender influences thermoregulatory responses under varying barometric pressures.

    Main Methods:

    • Eight healthy adults (4 men, 4 women) exercised at 60% peak aerobic power for 35 minutes.
    • Experiments were conducted at three barometric pressures: sea level (770 Torr), 2,596 m (552 Torr), and 4,575 m (428 Torr).

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  • Measurements included esophageal temperature (Tes), mean skin temperature (Tsk), local sweating (ms), and forearm skin blood flow (SkBF).

    • Main Results:

    • No significant gender differences were observed in the sensitivity or threshold of sweating or skin blood flow responses to temperature.
    • Sweating onset temperature did not change with altitude.
    • The sensitivity of sweating and skin blood flow to esophageal temperature decreased with increasing altitude, particularly at 4,575 m.

    Conclusions:

    • Acute hypobaric hypoxia does not alter the threshold for sweating or skin blood flow onset during exercise.
    • Reduced sensitivity of sweating and skin blood flow responses at higher altitudes may be linked to enhanced evaporative cooling capacity.
    • These findings suggest peripheral adjustments in thermoregulation occur in response to hypobaric hypoxia.