Changes in the patients' cardiopulmonary responses were measured before and at 5, 10 and 15 minutes during oscillation, and at 15 minutes after sputum suction. The measurement protocol for the CCPT group was the same as for the HFCWO group, except no measurements were taken at 5 or 10 minutes during percussion because it was not possible for a single nurse to perform percussion and record measurements at the same time.