 Trial design: An equivalencenon-inferiority randomized controlled trial with parallel group design studied the effect of two aerobic exercise-training intensities in COPD patient-centered outcomes. Methods: Thirty-four COPD clinically stable patients stratified from mild to very severe GOLD stages, were blinded to 60 or 80Wmax aerobic exercise training intensity in an outpatient pulmonary rehabilitation program, between 2009-2010. Outcomes were assessed with St.Georges respiratory questionnaire primary outcome, Mahler dyspnea index, London Chest activity of daily living scale, 6-minute walk, constant load and incremental exercise tests. Patients allocation sequence was computer-generated, with consignment in a safe deposit box. 