Limitations
COPD
COPD
Considering the factors of manpower, material resources and time, there are still some limitations in this study. First, compared with experimental studies, quasi-experimental studies are more feasible and practical in population intervention research. There are several limitations associated with quasi-experimental designs, which include lack of randomization, selection bias, performance bias and reporting bias. Large sample, multi-center, randomized controlled trials can be further carried out in the future. Second, we measured PA using a questionnaire but not using an accelerometer. Questionnaire-based surveys may be affected by recall bias, resulting in higher self-reported levels of PA. To obtain more accurate data, objective measurement tools such as accelerometers could be used to assess physical activity levels in the future. Third, the intervention and follow-up time of the project was only 12 weeks, which was relatively short. Exercise is a long-term process, and the health benefits of patients may be more significant with the increase in the duration of the intervention period. Therefore, we will continue to explore the lasting effects of this behavior change program on PA in COPD patients.