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Ventilatory patterns during steady state and progressive exercise.

O Szekely, J Askanazi, S H Rosenbaum

    Clinical Physiology (Oxford, England)
    |October 1, 1982
    PubMed
    Summary
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    This study compared low-level supine exercise responses to high-level upright exercise, analyzing breathing patterns and gas exchange. Findings suggest distinct control mechanisms for respiratory timing and flow during exercise.

    Area of Science:

    • Exercise Physiology
    • Respiratory Physiology

    Background:

    • Ventilatory and metabolic responses to high-level upright exercise are well-documented.
    • Understanding low-level supine exercise responses is crucial for a comprehensive view of physiological adaptations.

    Purpose of the Study:

    • To differentiate ventilatory and metabolic responses between low-level supine and high-level upright exercise.
    • To analyze respiratory cycle parameters (inspiratory time, flow, expiratory time, tidal volume, frequency) during exercise.
    • To investigate potential separate control mechanisms for respiratory timing and flow.

    Main Methods:

    • Non-invasive canopy system used for measuring breathing patterns and gas exchange.
    • Nine male subjects performed steady-state exercise (SSE) and progressive exercise (PRE) with identical total work.

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  • Workloads varied for SSE and PRE, with incremental increases in PRE.

    • Main Results:

    • Steady-state exercise (SSE) showed significant increases in tidal volume (Vt) and respiratory rate, leading to a 113% rise in minute ventilation (Ve).
    • Progressive exercise (PRE) demonstrated a stable respiratory rate after the initial level, with increasing Vt and Ve.
    • Decreased expiratory time was the primary factor reducing total respiratory cycle time in both exercise types.
    • Inspiratory time and respiratory frequency increased faster than tidal volume and inspiratory flow, suggesting separate control mechanisms.

    Conclusions:

    • Low-level supine exercise elicits distinct ventilatory and metabolic responses compared to high-level upright exercise.
    • Respiratory timing and flow appear to be regulated by separate mechanisms, potentially neurogenic and humoral, respectively.
    • The respiratory quotient decreases during both SSE and PRE, indicating a shift in substrate utilization or metabolic state.