Effectiveness of Different Exercise Rehabilitation Programs for Patients with Stable COPD

INTERVENTION: aerobic exercise rehabilitation group:aerobic exercise rehabilitation;Resistance exercise group:Home‐based upper‐ and lower‐limb elastic‐band resistance exercise; CONDITION: Stable chronic obstructive pulmonary disease (COPD); stable recovery phase after infection‐induced acute exacerbation of chronic obstructive pulmonary disease (AECOPD) PRIMARY OUTCOME: Change from baseline in the 6‐minute walk distance (6MWD); SECONDARY OUTCOME: Serum irisin level and change from baseline;Change from baseline in the modified Medical Research Council (mMRC) dyspnea score;Occurrence of COPD exacerbations during the 1‐year follow‐up after completion of the 8‐week intervention;Change from baseline in the Chronic Airways Assessment Test (CAAT) score;Change from baseline in pulmonary function parameters; INCLUSION CRITERIA: 1. Meet the GOLD diagnostic criteria for stable chronic obstructive pulmonary disease (COPD); 2. Post‐bronchodilator pulmonary function classified as GOLD stage II or III, with 30% <= FEV1% predicted <80%; 3. Aged 40 to 80 years; 4. Able to understand the study and voluntarily provide written informed consent.