Data collection
The general data and outcome indicators of this study were collected by two trained and qualified evaluators. The collection time of each indicator was as follows: (I) Baseline data: collected on the day of admission; (II) The outcome indicators included the main outcome indicators: physical activity, which was collected on the day of admission (T0), week 4 (T1), week 8 (T2) and week 12 (T3). Secondary outcome indicators: sedentary time, exercise ability, mMRC, exercise self-efficacy and CAT were collected at T0, T1, T2 and T3. Pulmonary function indexes were measured at T0 and T3. In addition to the baseline data collected in the hospital, the outcome indicators at the T1, T2 and T3 time points were mainly collected by telephone or WeChat. Electronic questionnaires were distributed to patients and filled in by the patients themselves. Questionnaires were collected on site. Vague questions or uncertain options should be checked with the patient before filling them in.