(1) Pregnant women, (2) resting heart rate <40 or >130 beats/min, (3) unstable angina or arrhythmia, (4) mean arterial pressure <65mmHg or >110mmHg, (5) peak body temperature >=38 degrees C, (6) resting blood oxygen saturation <=93%, (7) mechanical ventilation, (8) respiratory rate > 40 times/min or < 5 times/min, (9) hemodynamic instability, (10) severe liver and kidney dysfunction, (11) venous thrombosis or pulmonary thromboembolism, (12) the patient is not conscious, (13) other complications not suitable for respiratory rehabilitation, (14) imminent discharge or referral.

(1) Pregnant women, (2) resting heart rate <40 or >130 beats/min, (3) unstable angina or arrhythmia, (4) mean arterial pressure <65mmHg or >110mmHg, (5) peak body temperature >=38 degrees C, (6) resting blood oxygen saturation <=93%, (7) mechanical ventilation, (8) respiratory rate > 40 times/min or < 5 times/min, (9) hemodynamic instability, (10) severe liver and kidney dysfunction, (11) venous thrombosis or pulmonary thromboembolism, (12) the patient is not conscious, (13) other complications not suitable for respiratory rehabilitation, (14) imminent discharge or referral.