Aerobic exercise was performed using a treadmill (Inbramed Master) with the patient walking for 15 minutes. Speed was obtained from the 6MWD with distance divided by 360 s (6 minutes × 60 seconds) and the value obtained in m/s was transformed into km/h by multiplying by 3.6. The slope was increased by one point according to the Borg dyspnea scale ≤ 3 (moderate dyspnea) which was evaluated every five minutes during the exercise. Pulse oximeter (SpO2) and heart rate (HR) were monitored throughout the exercise. ECG was used to evaluate arrhythmia. The Borg scale for dyspnea and the legs and respiratory rate and blood pressure were monitored at the beginning and end of the exercise. There were two-minute warm-up and recovery using a lower speed and no inclination. Patients with hypoxemia SpO2 < 85% during training were supplemented with O2 according to medical prescription. Aerobic exercise will be considered safe if patients did not present with any clinical adverse event during or after exercise.