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Related Experiment Videos

Chest wall distortion during resistive inspiratory loading.

E R Ringel, S H Loring, J Mead

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |May 1, 1985
    PubMed
    Summary
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    Breathing with added resistance causes varied chest wall movements. Muscle activity and pressure data do not fully predict these complex, often behavioral, respiratory responses.

    Area of Science:

    • Respiratory Physiology
    • Biomechanics of Breathing

    Background:

    • Inspiratory loading alters respiratory mechanics.
    • Understanding chest wall motion during loaded breathing is crucial.

    Purpose of the Study:

    • To investigate chest wall motion patterns under inspiratory resistive loads.
    • To explore the relationship between muscle activity, pressures, and chest wall configuration.

    Main Methods:

    • Six subjects (1 naive, 5 experienced) breathed with added inspiratory resistance.
    • Measurements included chest wall motion (rib cage, abdomen), tidal volumes, pressures (transdiaphragmatic, pleural), and muscle electromyography.

    Main Results:

    • Varied inspiratory motion patterns were observed based on subject instructions.

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  • Predicting chest wall configuration from individual muscle contributions and pressures proved difficult.
  • Respiratory responses to loading showed substantial individual variability.

    • Conclusions:

    • Chest wall distortion during loaded breathing is complex and influenced by behavioral factors.
    • Overall respiratory motion is not easily inferred from electromyographic and pressure data alone.
    • Individual responses to inspiratory loading are highly variable.