Subjects with COPD exacerbation will be divided two groups. Group-1 will exercise with a bicycle ergometer until fatigue in addition to pulmonary rehabilitation. Group-2 will do the same exercises. Subjects in Group-2 will use virtual reality simulation, which is designed as cycling in the forest while cycling. Treatment will continue until discharge. CAT score, mMRC dyspnea score, hospital anxiety and depression score and London chest daily living activity score will be examined before and after treatment.
