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Hemoconcentration during isotonic handgrip exercise

Y Ohira, A Ito, S Ikawa

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |May 1, 1977
    PubMed
    Summary
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    Intense exercise causes hemoconcentration, indicated by water loss, in both exercised and non-exercised arms. Sauna exposure without exercise did not result in hemoconcentration, suggesting physical exertion is key.

    Area of Science:

    • Exercise Physiology
    • Human Physiology
    • Sports Medicine

    Background:

    • Understanding physiological responses to exercise is crucial for athletes and clinicians.
    • Hemoconcentration, a rise in blood viscosity, can impact performance and health.
    • The role of sweating versus physical exertion in hemoconcentration requires clarification.

    Purpose of the Study:

    • To investigate hemoconcentration during intense isotonic handgrip exercise.
    • To compare hemoconcentration in exercised versus non-exercised limbs.
    • To determine if sweating alone, without physical exertion, causes hemoconcentration.

    Main Methods:

    • Three healthy males performed maximal isotonic handgrip exercise.
    • Blood samples (serum water, total protein, hematocrit) were collected from both arms pre- and post-exercise.

    Related Experiment Videos

  • Three healthy males underwent sauna exposure (76°C for 20 min) with blood sampling during and after.

    • Main Results:

    • Intense exercise led to hemoconcentration in both exercised and non-exercised arms.
    • Water loss peaked earlier and was greater in the exercised arm.
    • Sauna exposure without exercise did not induce hemoconcentration.

    Conclusions:

    • Intense physical exertion, not just sweating, drives hemoconcentration.
    • Hemoconcentration occurs systemically, affecting both active and resting limbs.
    • Further research may explore the mechanisms linking exercise intensity to fluid shifts.