Breathing exercises for patients with COPD: to teach or not to teach.
D000368:Aged; D001945:Breathing Exercises; D006801:Humans; D010101:Oxygen Consumption / Q000502:physiology; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology* / Q000534:rehabilitation*; D015656:Respiratory Mechanics / Q000502:physiology