Pulmonary Rehabilitation in Patients with COPD (5)
Twelve-minute Walking Distance: This test was performed in a hospital corridor. The patients were instructed to walk as long a distance as possible during a period of 12 minutes. During the test, they were continuously encouraged to reach a maximal walking distance. Before entering the study, the patients completed one 12-minute walking test to become familiar with this test. proventil inhaler
Maximal Inspiratory Mouth Pressure: The PImax from residual volume was measured by means of a flanged occluded mouthpiece, with a small leak, connected to a manometer (Validyne). Measurements were repeated until three consecutive values were within 10 percent of each other. The highest value was taken as PImax.
Electromyogram (EMG): Standard surface electrodes (diameter, 5 mm) with conducting gel were used for the recording of the myoelectric activity of the diaphragm and the intercostal muscles. For the diaphragm, the electrodes were placed in the sixth and seventh intercostal spaces on the right anterior axillary line. The intercostal electrodes were placed in the second and third left intercostal spaces, 2 cm from the edge of the sternum. To minimize disturbances of nonrespiratory muscles, the patients were in a semirecumbent position with appropriate support for their arms.