Abstract: Objective To explore the effects of respiratory exercises combined with aerobic exercise on blood gas analysis and lung function in patients with stable COPD. Methods Clinical data of 100 patients with COPD stable stage admitted to Rizhao Central Hospital from January 2020 to May 2022 were retrospectively analyzed and divided into two groups according to different intervention methods. The control group (n=50) received aerobic exercise, and the observation group (n=50) received respiratory exercises combined with aerobic exercise, continuous training for 2 months. Blood gas analysis index, lung function index, exercise endurance and quality of life were compared between the two groups. Results There was no significant difference in blood gas analysis indexes between the two groups before intervention (P>0.05). After intervention, the partial oxygen pressure (PaO₂) and oxygen saturation (SaO₂) of the observation group were higher than those of the control group, while the partial carbon dioxide pressure (PaCO₂) of the observation group was lower than that of the control group, and the difference was statistically significant (P<0.05). Before intervention, there was no significant difference in lung function index and exercise endurance between the two groups (P>0.05). After intervention, forced vital capacity (FVC), forced expiratory volume (FEV₁) at the first second, FEV₁/FVC and etc. in the observation group were higher than those in the control group; The walking distance of 6 min was longer than that of control group,and the difference was statistically significant (P<0.05). Before intervention, there was no significant difference in quality of life between the two groups (P>0.05). After intervention, the scores of psychological dimension, spiritual dimension,environmental dimension, physiological dimension, social relation dimension, independence dimension, general health and quality of life in the World Health Organization Quality of Life Scale (WHOQOL-100) in the observation group were higher than those in the control group, and the differences were statistically significant (P<0.05). Conclusion Combined aerobics with aerobic exercise can improve the blood gas index of patients with COPD,restore lung function, and improve exercise endurance and quality of life of patients.

Key words: copd stable stage, breathing exercises, aerobic exercise, blood gas analysis