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[Circulatory and hormonal changes induced by microgravity].

C Gharib, A Güell, L Pourcelot

    Journal De Physiologie
    |January 1, 1985
    PubMed
    Summary
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    Microgravity causes body fluid shifts, activating hormonal responses like decreased vasopressin, renin, and aldosterone. Prolonged spaceflight leads to cardiovascular deconditioning and hormonal changes, with adaptation knowledge still emerging.

    Area of Science:

    • Physiology
    • Space Medicine
    • Endocrinology

    Context:

    • Spaceflight and simulated weightlessness induce fluid shifts.
    • Central circulation engorgement activates mechanoreceptors.
    • Understanding physiological adaptation to microgravity is crucial.

    Purpose:

    • To investigate the hormonal and cardiovascular responses to microgravity.
    • To analyze the effects of fluid shifts on plasma volume regulation.
    • To explore adaptations during prolonged space missions.

    Summary:

    • Absence of hydrostatic pressure causes fluid to shift centrally, triggering hormonal changes (decreased vasopressin, renin, aldosterone) via the Gauer reflex.
    • Prolonged microgravity exposure results in cardiovascular deconditioning and altered hormone secretion/rhythms.

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  • Despite 24 years of astronaut studies, cardiovascular and hormonal adaptation to spaceflight remains incompletely understood.

    • Impact:

    • Informs strategies for astronaut health during long-duration space missions.
    • Contributes to understanding fluid regulation and cardiovascular adaptation.
    • Highlights the need for further research into spaceflight's physiological effects.