Result: There were 10 patients in the mild dyspnea group and 15 in the severe dyspnea group. Lower extremity muscle mass, trunk muscle mass, Skeletal Muscle Mass Index, incremental shuttle walk test distance, Nagasaki University Respiratory ADL questionnaire scores, number of steps in a day, walking time, each Ex amount, activity time over 3 metabolic equivalents, and weekly Ex amount were significantly higher in the mild dyspnea group. COPD Assessment Test and St. George’s Respiratory Questionnaire scores were significantly lower in the mild dyspnea group.