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Cardiovascular response to combined dynamic and static exercise

A Kilbom, J Persson

    Circulation Research
    |June 1, 1981
    PubMed
    Summary
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    Adding static handgrip exercise to dynamic leg exercise minimally impacts cardiac output. However, handgrip

    Area of Science:

    • Exercise Physiology
    • Cardiovascular Regulation

    Background:

    • Static handgrip and dynamic leg exercise elicit distinct cardiovascular responses.
    • Understanding combined exercise effects on circulation is crucial for exercise prescription.

    Purpose of the Study:

    • To investigate the cardiovascular response to combined static handgrip and dynamic leg exercise.
    • To determine the influence of handgrip on cardiac output, blood pressure, and blood flow during dynamic exercise.

    Main Methods:

    • Young male subjects performed isolated static handgrip (20% MVC) and combined handgrip with dynamic leg exercise (100 W).
    • Measurements included cardiac output, arterial blood pressure, leg blood flow, and temperature in mixed venous blood and subcutaneous tissue.
    • Cardiovascular responses were assessed at varying levels of maximal oxygen uptake (VO2).

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    Main Results:

    • Isolated handgrip increased cardiac output by 30%; combined exercise increased it by 7%.
    • Leg blood flow remained unchanged despite increased blood pressure during handgrip, suggesting peripheral redistribution.
    • Heart rate response to handgrip diminished with increasing VO2, indicating vagal withdrawal as a key mechanism.

    Conclusions:

    • Combined static handgrip and dynamic leg exercise results in a blunted cardiac output response compared to isolated handgrip.
    • Peripheral blood flow is redistributed during combined exercise, not increased.
    • Vagal withdrawal is the primary driver of heart rate increase during combined exercise, with blood pressure response to handgrip diminishing at high VO2 levels.