Changing characteristics of cardiopulmonary exercise test in chronic obstructive pulmonary diseases patients when peak exercising

Objective To study the changing characteristics of cardiopulmonary exercise test (CPET) in chronic obstructive pulmonary diseases (COPD) patients who take peak exercises.Methods 102 stable COPD male patients and 31 healthy men uuderwent pulmonary function test and CPET.The parameters of pulmonary function test included FVC,FVC ％ pred,FEV1,FEV1 ％ pred,FEV1/FVC％ and MVV％ pred.The parameters of CPET included peakLoad,peakLoad ％ pred,peak (V) O2 ％ pred,peak (V)O2 /kg,peak (V) E,peakHR and peakO2 pulse.We compared these results between different stages of COPD group and control group.Results There was a significant reduction in peakLoad of patients in mild COPD group in comparison to the control group.The peakLoad,peakLoad％ pred,peak (V) O2/kg,peak (V) E and peakHR of patients in moderate COPD were significantly reduced compared with those in control group,and all the parameters of CPET were significantly reduced in severe COPD group than those in control group.Conclusions The variations of CEPT parameters in peak excising COPD patients were not identical.The perfection of CPET parameters could improve the existing classification of the COPD condition evaluation,as well as helps the doctors to master patients conditions more thoroughly and find complications earlier.It has great significance in the guidance of patients' future treatment. Key words: Chronic obstructive pulmonary disease; Cardiopulmonary exercise test; Peak exercising