[Purpose] Fragmentary studies on characteristics of respiratory muscles are being done to increase respiratory capacity by
classifying exercises into voluntary respiratory exercise which relieves symptoms and prevents COPD and exercise using breathing
exercise equipment. But this study found changes on respiratory pattern through changes on the activity pattern of agonist and
synergist respiratory muscles and studied what effect they can have on body function improvement. [Subjects and Methods]
Fifteen subjects in experimental group I that respiratory exercise of diaphragm and 15 subjects in experimental group II that
feedback respiratory exercise were randomly selected among COPD patients to find the effective intervention method for COPD
patients. And intervention program was conducted for 5 weeks, three times a week, once a day and 30 minutes a session. They
were measured with BODE index using respiratory muscle activity, pulmonary function, the six-minute walking test, dyspnea
criteria and BMI Then the results obtained were compared and analyzed. [Results] There was a significant difference in
sternocleidomastoid muscle and scalene muscle and in 6-minute walk and BODE index for body function. Thus the group
performing feedback respiratory had more effective results for mild COPD patients. [Conclusion] Therefore, the improvement was
significant regarding the activity of respiratory muscles synergists when breathing before doing breathing exercise. Although, it is
valuable to reduce too much mobilization of respiratory muscles synergists through the proper intervention it is necessary to study
body function regarding improvement of respiratory function for patients with COPD.