Participants
chronic respiratory disorders, COPD
DISEASE, RECRUITMENT, COPD, CHRONIC OBSTRUCTIVE LUNG DISEASE, SKELETAL MUSCLE DISEASE
From June 2018 to October 2019, participants with stable COPD were recruited and screened in the Department of Respiratory, Shanghai University of Traditional Chinese Medicine Yueyang Hospital of Integrated Traditional Chinese Medicine and Western Medicine (Shanghai, China). Participants were mainly recruited through publishing recruitment announcements in posters, and WeChat promotions with the eligibility criteria of the trial.The diagnosis of COPD was confirmed following the 2017 Global Initiative for Chronic Obstructive Lung Disease criteria [Exclusion criteria are as follows: (1) Unable to communicate or unable to follow commands; (2) Acute exacerbation that requires a change in pharmacological management or hospitalization; (3) Coexistence of other chronic respiratory disorders; (4) Skeletal muscle disease or other disease hampering assessment of muscle strength; (5) Current participation in any experimental trial.