Lighter than air: heliox breathing improves exercise tolerance in COPD.
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D017079:Exercise Tolerance / Q000502:physiology*; D006371:Helium / Q000627:therapeutic use*; D006801:Humans; D010100:Oxygen / Q000627:therapeutic use*; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology* / Q000628:therapy*; D012138:Respiratory Therapy / Q000379:methods*
D006371:Helium; C038949:heliox; D010100:Oxygen