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Ventilatory responses to static handgrip exercise.

S R Muza, L Y Lee, R L Wiley

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |June 1, 1983
    PubMed
    Summary
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    Fatiguing static exercise increases breathing rate and decreases end-tidal CO2. Maintaining constant CO2 levels did not alter this ventilatory response, suggesting central command or muscle afferents drive the changes during exercise.

    Area of Science:

    • Exercise Physiology
    • Respiratory Physiology
    • Human Physiology

    Background:

    • Fatiguing static exercise is known to cause hyperventilation.
    • A decrease in end-tidal CO2 partial pressure (PETCO2) is observed during such exercise.
    • Understanding the ventilatory response pattern and isocapnic conditions is crucial.

    Purpose of the Study:

    • To examine changes in breathing patterns during static exercise.
    • To define the isocapnic ventilatory response during static exercise.
    • To investigate the relationship between perceived effort and ventilatory response.

    Main Methods:

    • Six healthy males performed static handgrip exercise at 15%, 25%, or 30% maximum voluntary contraction (MVC).
    • Exercise was sustained for 5 minutes with PETCO2 either held constant or allowed to vary freely.

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  • Measurements included tidal volume (VT), inspiratory ventilation (VI), respiratory frequency (f), heart rate (HR), arterial blood pressure (BP), and PETCO2.

    • Main Results:

    • At 25% and 30% MVC, progressive increases in VT, VI, VT/TI, HR, and arterial BP were observed.
    • Breath-to-breath variability of VT increased, while respiratory frequency remained unchanged.
    • PETCO2 decreased progressively when allowed to run free; keeping PETCO2 constant did not alter the ventilatory response pattern or magnitude.
    • Perceived effort mirrored the time course and magnitude of the ventilatory response.

    Conclusions:

    • The ventilatory response to static exercise is characterized by increased tidal volume and variability, not increased respiratory frequency.
    • Maintaining isocapnic conditions does not alter the ventilatory response, suggesting central chemoreceptors may not be the primary driver.
    • Muscle afferents and/or increased central command associated with fatigue likely play a significant role in the observed ventilatory control instability.