Sequential NIPPV + IMT intervention enhanced the exercise tolerance of COPD patients
COPD
COPD
After 8 weeks of treatment, exercise tolerance was measured using the 6MWT method. As shown in Fig. 
Sequential NIPPV + IMT intervention enhanced the exercise tolerance of COPD patients. A total of 100 COPD patients were enrolled and randomly divided into OT group, NIPPV group, IMT group and NIPPV + IMT group. After 8 weeks of treatment, 6MWT method was used to examine the exercise tolerance. All indices were determined at least three times. *P < 0.05