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Ventilatory adjustments during sustained mechanical loading in conscious humans.

K Axen, S S Haas, F Haas

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |October 1, 1983
    PubMed
    Summary

    Conscious humans activate neural mechanisms to compensate for breathing challenges. These responses vary by load type and size, with non-chemical factors primarily driving the adjustments.

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    Area of Science:

    • Respiratory Physiology
    • Human Physiology
    • Neuroscience

    Background:

    • Breathing regulation involves complex neural control to maintain adequate ventilation.
    • Understanding ventilatory responses to mechanical loads is crucial for respiratory health.
    • Previous research has explored responses to inspiratory loading, but individual variations and load-specific adaptations require further elucidation.

    Purpose of the Study:

    • To analyze ventilatory responses to elastic and resistive inspiratory loads in healthy men.
    • To investigate individual differences in breathing patterns and timing during sustained loading.
    • To compare neural load compensation with chemical stimuli like hypercapnia.

    Main Methods:

    • 67 healthy men were subjected to elastic and resistive inspiratory loads.

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  • Ventilatory parameters, including tidal volume (VT) and breathing frequency, were measured over 10 loaded breaths.
  • Responses were analyzed for individual variations and group trends, with comparisons to CO2-induced hypercapnia.

    • Main Results:

    • Individual breathing patterns varied from rapid-shallow to slow-deep, with "VT defenders" using longer inspirations.
    • Group minute ventilation increased with sustained loading due to larger tidal volumes and stable frequencies.
    • Elastic loading primarily increased inspiratory force, while resistive loading involved increased force and duration; both were less potent than CO2 stimulus.

    Conclusions:

    • Repeated mechanical loading in conscious humans activates neural load-compensating mechanisms.
    • The neural response range is influenced by the size and type of the mechanical load.
    • The primary stimulus for these compensatory breathing adjustments appears to be non-chemical.