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Related Experiment Videos

Overview of ventilatory control during exercise.

G D Swanson

    Medicine and Science in Sports
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    The cause of increased ventilation during exercise remains unclear. A feed-forward/feed-back model suggests CO2 production drives ventilation, with feedback mechanisms ensuring stable CO2 levels.

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    Area of Science:

    • Physiology
    • Exercise Physiology
    • Respiratory Control

    Background:

    • The ventilatory response to exercise is a long-studied phenomenon.
    • The precise physiological drivers of increased ventilation during physical activity are not fully understood.

    Purpose of the Study:

    • To explore the underlying mechanisms of the ventilatory response to exercise.
    • To propose a model for ventilatory control during exercise.

    Main Methods:

    • Review of existing data from exercise studies incorporating inspired CO2 challenges.
    • Analysis of experimental results from intravenous CO2 loading.

    Main Results:

    • Evidence suggests a feed-forward/feed-back control system regulates ventilation during exercise.

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  • Feed-forward control is linked to carbon dioxide (CO2) production.
  • Feed-back mechanisms, involving the carotid body and central chemoreceptors, regulate arterial CO2 tension.

    • Conclusions:

    • A combined feed-forward and feed-back system explains the tight coupling between ventilation and CO2 production during exercise.
    • This model accounts for the regulation of arterial CO2 levels despite exercise-induced metabolic changes.