ABSTRACT
Objective: To explore the effect of adopting inspiratory muscle training of heavy load of deep breathing trainer for exercise tolerance and breathing difficulty level of patient with chronic obstructive pulmonary disease COPD in stable stage.Methods: 108 patients with COPD in stable stage were divided into observation group(54 cases)and control group(54 cases).Patients of control group received resistance training of inspiratory muscle of low load(9 cm H2O)of deep breathing trainer.And that of observation group received inspiratory muscle training of heavy load(the maximum inspiratory pressure was 60％)of deep breathing trainer,and this training was arranged at morning and evening(the time of each training was 15 min)of every day,and the training included 6 times in each week,and the total training time was 6 months.And then the exercise tolerance(6 min walk distance,6MWD),the step number of pedometer,the score of breathing scale of modified medical British research council(mMRC)and lung function were compared.Results: The 6MWD and step number of pedometer of observation group of 1 month,3 months and 6 months post training were significantly higher than that of control group(t=12.365,t=13.254,t=12.845,P＜0.05),respectively.And the score of dyspnea of mMRC of observation group of 1 month,3 months and 6 months post training were significantly better than that of control group(t=4.365,t=4.021,t=4.325,P＜0.05),respectively.And the forced expiratory volume in one second(FEV1),FEV1％and the ratio of FEV1 and FVC％of lung function of 1 month,3 months and 6 months post training were significantly better than that pre training(F=3.265,F=2.985,F=2.963,P＜0.05).And the differences of the three indicators between observation group and control group were significant(F=3.474,F=3.146,F=3.271,P＜0.05).Conclusion: For patients with COPD in stable stage,the inspiratory muscle training of heavy load of deep breathing trainer can enhance exercise tolerance of patient,and relieve their symptom of dyspnea and improve lung function of patients.