Nasal High Flow to Maintain the Benefits of Pulmonary Rehabilitation in Chronic Obstructive Pulmonary Disease Patients

Experimental design: Patients achieving their last pulmonary rehabilitation session will be approached to participate in this study. Eligible patients who agree to participate in the study and sign informed consent will perform two baseline visit assessments: First visit: Incremental cardiopulmonary exercise testing. Second visit: Other baseline assessment (see outcome section), including a constant workload exercise testing at 75% of the maximal workload achieved during the incremental exercise testing. Then, patients will then be randomized to one of the following two arms: * Nasal high flow, * Usual care. After 6 months, patients will be invited to perform the same assessment as during the second baseline visit.