Most patients (54.5%) had severe dyspnea according to the Borg scale and none felt fatigue in the legs. Our results agree with those of Troosters et al. (2010) who performed anaerobic training with 17 hospitalized COPD patients and did not observe adverse clinical events. However, a randomized study of hospitalized COPD patients was performed by Tang et al. (2012) using three groups: control (n = 11), low-intensity exercise (n = 11), and moderate-high intensity exercise (n = 10). The low-intensity training group performed aerobic training each day for 7.5 minutes at 40% of the 6-minute walk test speed associated with muscle training at a load of 40% of one maximum repetition. The moderate-high intensity training group performed the same activities, but with a load of 70%. The authors identified 13 adverse events; one was a serious arrhythmia event in patients during mild training. The most frequently reported adverse event in the study was the feeling of fatigue or malaise which was more frequent in the moderate-high intensity group, but without significant difference .