title: Airway closure and lung volumes during breathing with maintained airway positive pressures.
mesh_terms: D000328:Adult; D002986:Clinical Trials as Topic; D006801:Humans; D008168:Lung / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009584:Nitrogen; D012123:Pulmonary Ventilation; D012119:Respiration; D013147:Spirometry
chemical_list: D009584:Nitrogen