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Respiratory muscle fatigue limiting physical exercise?

J W Fitting1

  • 1Département de médecine interne, Centre hospitalier universitaire vaudois, Lausanne, Switzerland.

The European Respiratory Journal
|January 1, 1991
PubMed
Summary

Inspiratory muscle fatigue may limit exercise in healthy individuals and COPD patients. However, its precise role and the effectiveness of interventions like respiratory muscle training remain unclear.

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Area of Science:

  • Respiratory Physiology
  • Exercise Science

Background:

  • Inspiratory muscle fatigue is known during loaded breathing and respiratory failure.
  • Its contribution to exercise limitation, especially in COPD patients, is not fully understood.

Purpose of the Study:

  • To investigate the role of inspiratory muscle fatigue in exercise limitation.
  • To evaluate the impact of interventions on exercise tolerance in COPD patients.

Main Methods:

  • Electromyography (EMG) used to detect diaphragmatic fatigue during hyperventilation and high-power cycling.
  • Assessment of exercise tolerance following interventions like respiratory muscle rest and training.

Main Results:

  • EMG signs of diaphragmatic fatigue occur at high ventilation levels and during strenuous exercise in healthy subjects and COPD patients.
  • Prior inspiratory muscle fatigue reduces exercise tolerance in healthy individuals; its effect in COPD is less clear.
  • Evidence for improved exercise tolerance with respiratory muscle rest or training in COPD is inconclusive.

Conclusions:

  • While inspiratory muscle fatigue can occur during exercise, its direct link to exercise limitation requires further investigation.
  • The efficacy of interventions targeting respiratory muscles to improve exercise tolerance in COPD patients is not definitively established.

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