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Rib cage distortion and dynamic hyperinflation during two exercise intensities in people with COPD.

Danielle S R Vieira1, Liliane P S Mendes2, Maria Clara N Alencar3

  • 1Rehabilitation Sciences Graduation Program, Universidade Federal de Santa Catarina, Rodovia Governador Jorge Lacerda, Jardim das Avenidas, 89906-072, Araranguá, Santa Catarina, Brazil; Department of Health Sciences, Universidade Federal de Santa Catarina, Rodovia Governador Jorge Lacerda, Jardim das Avenidas, 89906-072, Araranguá, Santa Catarina, Brazil.

Respiratory Physiology & Neurobiology
|June 26, 2021
PubMed
Summary

Rib cage distortion in COPD patients did not limit exercise capacity, even without dynamic hyperinflation. Chest wall volumes changed during exercise, but distortion patterns were consistent.

Keywords:
Chronic pulmonary obstructive diseaseConstant-load exercise testOptoelectronic plethysmography

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Area of Science:

  • Respiratory Physiology
  • Pulmonary Rehabilitation

Background:

  • The link between rib cage (RC) motion abnormalities, dynamic hyperinflation (DH), and exercise limitation in COPD is debated.
  • Understanding these relationships is crucial for improving COPD management.

Purpose of the Study:

  • To examine RC distortion and operational chest wall volumes during moderate and high-intensity constant-rate exercises in COPD patients.
  • To clarify the role of RC mechanics in exercise intolerance in COPD.

Main Methods:

  • Seven male COPD participants underwent incremental and constant-rate cycle ergometer tests (60% and 80% peak work rate).
  • Optoelectronic plethysmography assessed RC distortion (phase angle, inspiratory/expiratory phase ratios) and chest wall volumes (end-inspiratory/end-expiratory).

Main Results:

  • Inspiratory and expiratory phase ratios of the rib cage significantly increased during both exercise intensities.
  • End-inspiratory chest wall volume increased, while end-expiratory volume remained unchanged.
  • Rib cage distortion occurred independently of dynamic hyperinflation.

Conclusions:

  • Rib cage distortion did not appear to limit exercise capacity in the studied COPD population.
  • RC distortion was observed even without dynamic hyperinflation, suggesting complex mechanics in COPD exercise.