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Related Experiment Videos

Lung centroid pressure in immersed man.

N A Taylor1, J B Morrison

  • 1Faculty of Physical Education, University of Otago, Dunedin, New Zealand.

Undersea Biomedical Research
|January 1, 1989
PubMed
Summary
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Lung centroid pressure (PLC) measurement during immersion reveals new insights into respiratory mechanics. Upright immersion requires +13.6 cmH2O PLC, differing from previous estimates, impacting understanding of breathing pressures.

Area of Science:

  • Physiology
  • Respiratory Mechanics
  • Hydrostatic Pressure Effects

Background:

  • Upright immersion creates a pressure gradient between alveolar and external thoracic pressure.
  • Lung centroid pressure (PLC) is the pressure needed to equalize this imbalance.
  • Previous studies suggest a specific PLC value for upright immersion, which requires validation.

Purpose of the Study:

  • To determine static transrespiratory pressure-volume relationships in subjects during upright and prone immersion.
  • To calculate Lung Centroid Pressure (PLC) in different body postures.
  • To compare measured PLC values with existing literature, particularly for upright immersion.

Main Methods:

  • Subjects underwent static transrespiratory pressure-volume measurements in upright and prone immersed positions.

Related Experiment Videos

  • Lung compliance was measured during immersion and compared to upright, non-immersed conditions.
  • PLC was determined by analyzing the pressure displacement of immersed compliance curves.

    • Main Results:

    • Lung compliance during immersion was consistent across postures (1.87 L·kPa⁻¹) and similar to upright, non-immersed measurements (1.84 L·kPa⁻¹).
    • Calculated PLC was +1.33 ± 0.11 kPa (13.6 cmH2O) in the upright position and -0.69 ± 0.12 kPa (-7.0 cmH2O) in the prone position.
    • The determined upright PLC value differs from the commonly cited +19 cmH2O.

    Conclusions:

    • The calculated upright Lung Centroid Pressure (PLC) of +13.6 cmH2O challenges previous assumptions.
    • Adjusting historical data for reference pressure differences supports the current findings.
    • This study refines the understanding of respiratory mechanics under hydrostatic pressure during immersion.