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Respiratory muscle strength may explain hypoxia-induced decrease in vital capacity.

Gaël Deboeck1, Jean Jacques Moraine, Robert Naeije

  • 1Department of Physiology, Faculty of Medicine, Free University of Brussels, Belgium.

Medicine and Science in Sports and Exercise
|May 5, 2005
PubMed
Summary

High altitude exposure reduces lung capacity by weakening respiratory muscles. This study shows decreased inspiratory and expiratory pressures correlate with lower forced vital capacity (FVC) at simulated high altitudes.

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Area of Science:

  • Physiology
  • Altitude Medicine
  • Respiratory Function

Background:

  • High altitude exposure is known to reduce forced vital capacity (FVC).
  • The underlying physiological mechanisms for this reduction are not fully understood.
  • Hypoxia-induced respiratory muscle weakness is a potential contributing factor.

Purpose of the Study:

  • To investigate the role of hypoxia-related respiratory muscle weakness in the reduction of FVC at high altitude.
  • To quantify changes in respiratory muscle strength during simulated high-altitude exposure.

Main Methods:

  • Healthy subjects (n=15) were exposed to simulated altitude (4267 m) in a hypobaric chamber.
  • Measurements included maximal inspiratory and expiratory pressures (MIP, MEP), sniff nasal inspiratory pressure (SNIP), FVC, peak expiratory flow rate (PEF), and forced expiratory volume in 1 s (FEV1).

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  • Data were collected before and after 1, 6, and 12 hours of exposure.

    • Main Results:

    • A progressive decrease in FVC, MIP, MEP, and SNIP was observed with increasing exposure time.
    • MIP, MEP, and SNIP showed strong correlations with FVC.
    • FEV1 remained unchanged, and PEF increased less than predicted by air density changes.

    Conclusions:

    • Decreased respiratory muscle strength is a significant factor contributing to reduced FVC at high altitude.
    • Hypoxia appears to impair respiratory muscle function, impacting lung volumes.