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Related Experiment Videos

Urinary responses to cold temperature during water immersion.

D R Knight, S M Horvath

    The American Journal of Physiology
    |May 1, 1985
    PubMed
    Summary

    Cold water immersion increases urine output, but not through the expected Henry-Gauer reflex. Both cold temperature and water pressure contribute to this diuretic effect, with water pressure being a major factor.

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    Area of Science:

    • Physiology
    • Environmental Medicine

    Background:

    • The Henry-Gauer reflex is a physiological response to cold and water immersion.
    • Understanding urinary responses to cold water immersion is crucial for human physiology research.

    Purpose of the Study:

    • To investigate if cold temperature and water pressure stimulate the Henry-Gauer reflex during cold water immersion.
    • To compare urinary responses to cold air, thermoneutral water, and cold water immersion.

    Main Methods:

    • Human subjects were exposed to different environmental conditions: cold air, thermoneutral water, and cold water.
    • Urinary responses, including free water clearance (CH2O) and osmolar clearance, were measured.
    • Control measurements were taken during thermoneutral air exposure.

    Main Results:

    • Free water clearance (CH2O) did not significantly increase in cold water compared to other conditions.
    • Diuresis was characterized by increased osmolar clearance, not free water clearance.
    • Cold temperature and water pressure additively increased urinary output, with water pressure responsible for two-thirds of water loss.
    • Elevated sodium excretion began earlier in cold water immersion, potentially due to cold-induced vasoconstriction.
    • Urinary function was also time-dependent, with potassium excretion increasing over time.

    Conclusions:

    • The diuretic response to cold water immersion in humans is atypical for the Henry-Gauer reflex.
    • Both cold temperature and water pressure contribute to increased urinary output.
    • Kidney function responds to changes in central blood volume, as indicated by sodium excretion patterns.

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