title: Exercise limitation in chronic obstructive pulmonary disease (COPD)
authors.forename: A D
authors.initials: AD
authors.lastname: D'Urzo
mesh_terms: D000403:Airway Resistance / Q000187:drug effects / Q000502:physiology; D005080:Exercise Test; D006371:Helium / Q000008:administration & dosage; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy; D010102:Oxygen Inhalation Therapy; D014939:Work of Breathing / Q000187:drug effects / Q000502:physiology
chemical_list: D006371:Helium