Sequential NIPPV + IMT treatment relived the oxidative stress of COPD patients
COPD
COPD, OXIDATIVE STRESS
By ELISA assay, we could observe that the ROS and MDA levels in patients of NIPPV, IMT and sequential NIPPV + IMT groups were obviously reduced, but the activities of SOD and GSH were upregulated, compared those in patients in OT group (Fig. 
Sequential NIPPV + IMT treatment relived the oxidative stress of COPD patients. The serum samples were obtained from COPD patients in each groups, then the levels of ROS 