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Posthyperventilation isocapnic hyperpnea

G D Swanson, D S Ward, J W Bellville

    Journal of Applied Physiology
    |April 1, 1976
    PubMed
    Summary
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    During recovery from voluntary hyperventilation, breathing (hyperpnea) persisted in most subjects. This respiratory control finding suggests oscillator properties may govern the human respiratory center.

    Area of Science:

    • Physiology
    • Respiratory Control
    • Neuroscience

    Background:

    • Voluntary hyperventilation is a common method to study respiratory control.
    • Maintaining normal end-tidal CO2 and O2 tensions during hyperventilation is crucial for isolating specific respiratory responses.
    • The behavior of the respiratory center after a stimulus removal is not fully understood.

    Purpose of the Study:

    • To investigate the respiratory response during the recovery period after voluntary hyperventilation.
    • To determine if the respiratory center exhibits properties of an oscillator.
    • To explore the potential role of cardiodynamic hyperpnea in the recovery response.

    Main Methods:

    • Subjects performed 10 breaths of voluntary hyperventilation.
    • A dynamic end-tidal forcing technique maintained normal end-tidal CO2-O2 tensions.

    Related Experiment Videos

  • Breathing patterns were monitored during hyperventilation and the subsequent recovery period.

    • Main Results:

    • Six out of seven subjects showed a persistent breathing response (hyperpnea) during recovery.
    • The average recovery response showed an initial drop to 32% of hyperventilation magnitude.
    • This response decayed exponentially with a time constant of 22 seconds.

    Conclusions:

    • The observed recovery period response suggests that the human respiratory center may behave like a physical or neural oscillator.
    • Oscillator properties, including amplitude persistence after stimulus removal, may govern respiratory control.
    • Cardiodynamic hyperpnea, resulting from increased cardiac output during isocapnic voluntary ventilation, could contribute to the observed recovery response.