Conclusion
The findings of our study suggest that compared with the usual care provided, the proposed program of 3 months of PQE intervention has significant improvement in exercise capacity, skeletal muscle strength, and quality of life of COPD-stable patients. Furthermore, the PQE can be used as an alternative exercise program for COPD-stable patients in family and community rehabilitation. Further studies are needed to confirm the effects of this program and explore the optimal ways of clinical promotion.