 Initially will be collected clinical and anthropometric data of the participants, and they are packaged in self-evaluation form. The evaluation of pulmonary function at rest spirometry, body plethysmography and lung diffusion capacity for carbon monoxide will be rescued from patient charts. When carried out for over six months, will be repeated by the researchers. Patients will conduct incremental CPET of 5-10W min limited by symptoms FEV1 1L - 5W or FEV1 1L - 10W Visit 1. After a period of 2-7 days the CPET will be performed submaximal with 75 of the peak load reached in the incremental CPET visits 2 and 3. The application of EPAP 10cmH2O via face mask Vital RHDSON Signs, New Jersey, USA will be randomized with the help of opaque envelopes to be given in one visit. During the visit without EPAP will be maintained using the facial mask applied without resistance. IC serial measurements will be carried out before, during and immediately after the exercise. Participants will be instructed to maintain the use of long-acting bronchodilator as prescribed by the medical assistant usually before the methodological stages of the study. 