Abstract
In patients with chronic obstructive pulmonary discease (COPD), respiratory muscles are more susceptible to fatigue than in normal subjects because of the increased pressure work to overcome the airway resistance caused by obstruction and of the decreased muscle efficiency due to hyperinflation of the lungs. This may lead to exertional dyspnea, reduce exercise performance, and contribute to the development of respiratory failure. To improve respiratory muscle endurance against fatigue, previous studies have proposed several non-specific or specific training programs. This report is to provide a brief review of respiratory muscle training methods (e.g., maximal normocapnic hyperpnea or resistive breathing) and to summarize their training effects on respiratory muscle function (including muscle strength and endurance) or exercise performance in COPD. In addition, the assessments of respiratory muscle function are also discussed.
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