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Related Experiment Videos

Venous pressure in man during weightlessness.

K A Kirsch, L Röcker, O H Gauer

    Science (New York, N.Y.)
    |July 13, 1984
    PubMed
    Summary
    This summary is machine-generated.

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    Pneumologie (Stuttgart, Germany)·2021

    Spaceflight causes fluid shifts to the head, initially increasing upper body venous pressure. Post-flight, venous pressure normalizes, revealing lower long-term circulation pressure compared to pre-flight levels.

    Area of Science:

    • Physiology
    • Space Medicine
    • Cardiovascular Research

    Background:

    • Spaceflight induces cephalad fluid shifts, impacting cardiovascular physiology.
    • Understanding long-term effects of fluid shifts on venous pressure is crucial for astronaut health.

    Purpose of the Study:

    • To investigate lasting changes in upper body venous pressure after spaceflight.
    • To assess the relationship between fluid shifts and venous pressure regulation.

    Main Methods:

    • Measured venous pressure and hematocrit in four astronauts pre-flight and post-flight (1 and 12 hours).
    • Compared in-flight measurements with pre- and post-flight data.

    Main Results:

    • In-flight: elevated hematocrit, decreased venous pressure.

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  • 1 hour post-flight: hemodilution, unexpectedly high venous pressures, and body weight loss.
  • 12 hours post-flight: lowest recorded venous pressures.

    • Conclusions:

    • The primary fluid shift occurs within the initial hours of spaceflight.
    • Peripheral venous and central circulation pressures are lower long-term compared to pre-flight.
    • Spaceflight-induced fluid shifts do not lead to lasting increases in upper body venous pressure.