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Related Experiment Videos

Plasma viscosity elevations with simulated weightlessness.

D G Martin, V A Convertino, D Goldwater

    Aviation, Space, and Environmental Medicine
    |May 1, 1986
    PubMed
    Summary
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    Bed rest causes changes in blood viscosity and aerobic capacity. While blood viscosity increased, it did not directly correlate with reduced aerobic capacity in this study.

    Area of Science:

    • Space physiology
    • Human physiology
    • Cardiovascular research

    Background:

    • Bed rest simulates weightlessness, causing dehydration and reduced aerobic capacity.
    • These changes may be linked by increased blood viscosity due to water loss, affecting blood flow for exercise.

    Purpose of the Study:

    • To examine how blood rheology changes with plasma volume during bed rest.
    • To correlate these rheological changes with alterations in maximal aerobic capacity (VO2max).

    Main Methods:

    • Eight healthy subjects underwent two 10-day bed rest periods.
    • Measured plasma viscosity, plasma volume, and maximal aerobic capacity (VO2max).
    • Utilized viscometry, dye dilution, and cycle ergometry.

    Main Results:

    Related Experiment Videos

    • Bed rest increased hematocrit, plasma protein, and fibrinogen, elevating plasma viscosity.
    • Fibrinogen increased significantly more than explained by hemoconcentration alone.
    • VO2max decreased in the first bed rest cycle but not the second.

    Conclusions:

    • Bed rest induces significant rheological changes in blood, including elevated plasma viscosity.
    • Despite observed perturbations, increased blood viscosity did not directly correlate with reduced VO2max in this study.
    • The relationship between hydration status, blood rheology, and aerobic capacity requires further investigation.