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Diaphragmatic function during immersion

V D Minh, G F Dolan, P G Linaweaver

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |August 1, 1977
    PubMed
    Summary
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    Immersion in water significantly impacts diaphragmatic function by reducing functional residual capacity (FRC) and increasing respiratory system stiffness. This leads to altered breathing mechanics, affecting tidal volume (VT) and intrathoracic pressure (Pmus).

    Area of Science:

    • Physiology
    • Respiratory Mechanics
    • Environmental Physiology

    Background:

    • Diaphragmatic function is crucial for respiration.
    • Immersion in water alters body configuration and pressures.
    • Understanding respiratory responses to immersion is important for safety and performance.

    Purpose of the Study:

    • To investigate diaphragmatic function during midneck-level immersion in dogs.
    • To analyze the effects of hydrostatic pressure and altered thoracic configuration on respiratory mechanics.

    Main Methods:

    • Constant electrophrenic stimulation was used in upright mongrel dogs.
    • Inspired volume (VT) and change in intrathoracic pressure (Pmus) were measured.
    • Functional residual capacity (FRC) was monitored before, during, and after immersion.

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    Main Results:

    • Immersion reduced functional residual capacity (FRC) to 55% of baseline.
    • Intrathoracic pressure (Pmus) increased 2.8-fold due to hydrostatic compression.
    • Despite increased Pmus, inspired volume (VT) decreased to 83% of baseline, indicating respiratory system stiffening.
    • Increased Pmus persisted post-immersion, linked to increased diaphragmatic length.

    Conclusions:

    • Immersion significantly stiffens the respiratory system.
    • Key factors affecting diaphragmatic function include FRC reduction, thoracic configuration changes, and respiratory system stiffening.
    • These physiological changes during immersion impact breathing effectiveness.