title: Respiratory nitrogen elimination: a potential source of error in closed-circuit spirometry.
mesh_terms: D001826:Body Fluids / Q000378:metabolism; D006801:Humans; D008168:Lung / Q000378:metabolism; D008297:Male; D008722:Methods; D009584:Nitrogen / Q000378:metabolism*; D010101:Oxygen Consumption; D012119:Respiration; D013147:Spirometry; D013997:Time Factors
chemical_list: D009584:Nitrogen