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Related Experiment Videos

Orthostatism and heat acclimation.

E Shvartz, N B Strydom, H Kotze

    Journal of Applied Physiology
    |October 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Heat acclimation through exercise significantly improves heat-orthostatism, reducing fainting during head-up tilt tests. Resting in heat alone does not induce acclimation, while mild training offers some benefits.

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    Area of Science:

    • Physiology
    • Environmental Medicine
    • Exercise Science

    Background:

    • Orthostatic intolerance, particularly in hot environments, poses a significant risk to individuals engaged in physical activity.
    • Understanding the physiological adaptations to heat exposure and exercise is crucial for preventing heat-related illnesses and syncope.

    Purpose of the Study:

    • To investigate the effects of different heat exposure and exercise protocols on heat-orthostatism and physiological responses.
    • To compare the efficacy of exercise-based heat acclimation versus passive heat exposure for improving tolerance to heat and orthostatic stress.

    Main Methods:

    • Three groups of subjects underwent distinct 8-day protocols involving head-up tilt tests, exercise in heat, and rest in heat.
    • Physiological parameters including heart rate, rectal temperature, and sweat rate were monitored throughout the exposures.

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  • Orthostatic tolerance was assessed by observing the incidence of fainting during post-exposure tilt tests.

    • Main Results:

    • Exercise-based heat acclimation (Group A) led to significant improvements in heat-orthostatism, evidenced by reduced fainting and better physiological regulation (decreased heart rate and rectal temperature, increased sweat rate).
    • Passive heat exposure (Group C) did not induce acclimation to working in heat, resulting in poor heat-orthostatism and fainting.
    • Mild training in a temperate environment (Group B) showed minor improvements in heat tolerance compared to passive heat exposure.

    Conclusions:

    • Exercise in heat is an effective method for improving heat-orthostatism and overall heat tolerance.
    • Acclimation to heat through exercise enhances physiological responses to orthostatic stress, comparable to improvements in exercise heart rate and rectal temperature.
    • Passive heat exposure is insufficient for developing tolerance to exertional heat stress.