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Dehydration-induced drinking in humans

J E Greenleaf

    Federation Proceedings
    |July 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Humans experience involuntary dehydration due to upright posture and fluid loss from sweat. Drinking during exercise is linked to sweat rate, not typical thirst signals like plasma osmolality.

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    Area of Science:

    • Human physiology
    • Exercise science
    • Fluid balance research

    Background:

    • Limited understanding of human fluid consumption compared to mammals.
    • Human rehydration differs, showing a delay termed 'involuntary dehydration'.
    • Unique human factors include upright posture and sweat-induced fluid/electrolyte loss.

    Purpose of the Study:

    • Investigate human drinking mechanisms and rehydration delays.
    • Examine the influence of posture, exercise, and heat on fluid intake.
    • Identify key dipsogenic factors influencing voluntary water consumption in humans.

    Main Methods:

    • Analysis of fluid consumption and rehydration patterns in humans.
    • Assessment of physiological responses (plasma osmolality, RBC volume, PRA, AVP) under stress.

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  • Controlled studies involving exercise, heat exposure, and dehydration.

    • Main Results:

    • Stress-induced hyperosmolality does not significantly alter human red blood cell volume.
    • Upright posture may influence drinking via plasma renin activity (PRA), independent of osmolality or vasopressin.
    • Exercise is the primary inhibitor of water intake during combined heat and dehydration stress.
    • Drinking rate during exercise correlates highly with sweat rate, not plasma volume, osmolality, or PRA.

    Conclusions:

    • Human rehydration is complex, influenced by posture and sweat loss.
    • Exercise significantly inhibits drinking, overriding traditional thirst cues.
    • While immediate thirst signals may be less critical during exertion, they likely initiate drinking under less stressful conditions.