The theory supporting the inclusion of upper extremity exercise training in the pulmonary rehabilitation for these patients, is based on the profound understanding of the activity of the accessory respiratory muscles, which are competitively involved in both the support of the upper extremities during activities and the ventilation. However, a systematic review of the literature carried out by our staff reveals that the clinical trials carried out up to now to verify the effectiveness of UEET are of poor methodological quality and the investigators cannot corroborate the recommendation recently made on the basis of the results of the investigators' review.