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Cardiorespiratory dynamics during sinusoidal and impulse exercise in man.

Y Miyamoto, Y Nakazono, T Hiura

    The Japanese Journal of Physiology
    |January 1, 1983
    PubMed
    Summary
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    This study examined physiological responses to exercise using sinusoidal and impulse work rates. Findings suggest exercise hyperpnea during unsteady states is linked to cardiac dynamics, not just neuro-humoral factors.

    Area of Science:

    • Exercise Physiology
    • Cardiorespiratory Dynamics
    • Human Physiology

    Background:

    • Understanding the dynamic physiological responses during exercise is crucial for optimizing training and performance.
    • Previous models often focused on steady-state conditions, limiting insights into transient exercise phases.

    Purpose of the Study:

    • To investigate the dynamic characteristics of ventilation, cardiac output, and gas exchange during varying work rates.
    • To differentiate between sinusoidal and impulse work rate responses in healthy individuals.

    Main Methods:

    • Utilized a bicycle ergometer with controlled electromagnetic braking for precise work rate manipulation.
    • Employed automated impedance cardiography for continuous cardiac output and stroke volume monitoring.
    • Conducted breath-by-breath analysis for detailed respiratory and gas exchange variables.

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    Main Results:

    • Sinusoidal work rate responses were modeled by first-order systems, with time constants varying for ventilation (VE), carbon dioxide output (VCO2), oxygen consumption (VO2), and cardiac output (Q).
    • Heart rate (HR) kinetics closely mirrored cardiac output (Q) dynamics.
    • Impulse work rate responses were better described by second-order models, indicating both fast and slow components, though the fast component's contribution was minimal.

    Conclusions:

    • The close linkage between VE and VCO2 dynamics during both sinusoidal and impulse exercise supports the cardiodynamic hypothesis for exercise hyperpnea.
    • These findings challenge purely neuro-humoral explanations for hyperpnea during unsteady-state exercise.