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Related Experiment Videos

Chest wall mechanics in sustained microgravity

M Wantier1, M Estenne, S Verbanck

  • 1Biomedical Physics Laboratory, Erasme University Hospital, Université Libre de Bruxelles, 1070 Brussels, Belgium.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|June 11, 1998
PubMed
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Astronauts experienced significant changes in chest wall mechanics during sustained weightlessness, with the abdomen contributing more to breathing. These effects were similar to short-term weightlessness and postural changes.

Area of Science:

  • Physiology
  • Space Medicine
  • Biomechanics

Background:

  • Chest wall mechanics are crucial for respiration.
  • Understanding how microgravity affects these mechanics is vital for astronaut health.
  • Previous studies indicated changes during short-term weightlessness.

Purpose of the Study:

  • To assess the long-term effects of weightlessness on chest wall mechanics in astronauts.
  • To quantify changes in abdominal and rib cage contributions to breathing during spaceflight.
  • To investigate the impact of sustained microgravity on respiratory system compliance.

Main Methods:

  • Studied five astronauts before, during, and after Spacelab D-2 and Euromir-95 missions.
  • Measured respiratory airflow, pressure, and rib cage/abdominal volumes.
Keywords:
NASA Discipline CardiopulmonaryNon-NASA Center

Related Experiment Videos

  • Utilized relaxation maneuvers and Konno-Mead plots to analyze chest wall mechanics.

    • Main Results:

    • Microgravity significantly increased abdominal contribution to tidal volume (from 30.7% to 58.3%).
    • Abdominal compliance increased in microgravity, while rib cage compliance remained unchanged.
    • Postflight day 1 showed altered mechanics, suggesting adaptation and readaptation phases.

    Conclusions:

    • Sustained weightlessness leads to significant, consistent alterations in chest wall mechanics, primarily driven by increased abdominal contribution.
    • These changes are comparable to short-term weightlessness and postural shifts but with distinct differences in rib cage compliance.
    • Findings highlight the body's adaptation to microgravity and the need for further research into long-term spaceflight effects on respiration.