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Related Experiment Videos

Effect of microgravity on the respiratory system.

L A Engel1

  • 1Thoracic Medicine Unit, Westmead Hospital, Sydney, New South Wales, Australia.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|May 1, 1991
PubMed
Summary

Weightlessness significantly improves lung ventilation and perfusion uniformity. However, it causes slight reductions in vital capacity and expiratory flow rates, with altered breathing mechanics.

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Area of Science:

  • Physiology
  • Aerospace Medicine
  • Respiratory System

Background:

  • Pulmonary function is gravity-dependent, leading to expected changes in weightlessness.
  • Previous studies on brief weightlessness confirm predictions of altered lung function.

Purpose of the Study:

  • To investigate the effects of weightlessness on lung function and breathing mechanics.
  • To assess changes in ventilation-distribution, perfusion, and respiratory parameters during simulated and actual weightlessness.

Main Methods:

  • Single-breath N2 washouts to assess ventilation distribution.
  • Cardiogenic oscillations and chest radiographs to infer perfusion.
  • Measurements of vital capacity, functional residual capacity, and expiratory flow rates.
  • Analysis of breathing patterns and aerosol deposition.

Main Results:

  • Marked reduction in ventilation inequality and greater uniformity of perfusion observed.
  • Functional residual capacity decreased by ~10%; vital capacity and expiratory flow rates slightly reduced.
  • Increased abdominal contribution to tidal volume, decreased abdominal girth, and increased abdominal compliance noted.
  • Reduced deposition of inhaled medium-sized aerosol particles.

Conclusions:

  • Weightlessness significantly alters lung function, improving distribution of ventilation and perfusion.
  • Changes in respiratory mechanics, including increased abdominal contribution to breathing, occur.
  • Further research on prolonged weightlessness effects is needed.

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