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Ventilatory control during exercise with increased external dead space.

S A Ward, B J Whipp

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |February 1, 1980
    PubMed
    Summary
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    Adding external dead space (VD) during exercise shifts the ventilatory control but maintains CO2 regulation. The human respiratory system effectively adjusts to increased VD, resetting the regulated partial pressure of carbon dioxide (PACO2).

    Area of Science:

    • Physiology
    • Respiratory Control
    • Exercise Physiology

    Background:

    • External dead space (VD) is a critical factor influencing ventilatory control during physiological stress.
    • Understanding the respiratory system's response to increased VD during exercise is essential for assessing ventilatory regulation.

    Purpose of the Study:

    • To determine the effects of increased external dead space (VD) on ventilatory control during steady-state exercise in healthy adults.
    • To investigate how varying levels of external dead space impact the relationship between minute ventilation (VE) and carbon dioxide output (VCO2), and mean alveolar PCO2 (PACO2).

    Main Methods:

    • Three healthy adults performed cycle ergometer exercise with incrementally increased external dead space (0.1–1.0 L).
    • Work rate was progressively increased every 5 minutes (15–20 W increments).

    Related Experiment Videos

  • Steady-state measurements included minute ventilation (VE), carbon dioxide output (VCO2), and mean alveolar PCO2 (PACO2).

    • Main Results:

    • The relationship between minute ventilation (VE) and carbon dioxide output (VCO2) remained linear but shifted upward with increased external dead space (VD).
    • Increased VD led to an elevated mean alveolar PCO2 (PACO2), independent of carbon dioxide output (VCO2).
    • The observed increases in minute ventilation (VE) with added dead space were comparable to responses seen in CO2 inhalation studies.

    Conclusions:

    • Increasing external dead space (VD) does not fundamentally impair the human respiratory system's ability to regulate PCO2 during exercise.
    • The primary effect of increased external dead space is a resetting of the regulated PCO2 level.
    • The respiratory system adapts to maintain CO2 homeostasis despite the added ventilatory burden.