title: Assessment of changes in airway calibre I. Tests of forced expiration.
mesh_terms: D000403:Airway Resistance; D000818:Animals; D001249:Asthma / Q000503:physiopathology; D005540:Forced Expiratory Flow Rates; D006371:Helium; D006801:Humans; D008448:Maximal Expiratory Flow Rate; D010366:Peak Expiratory Flow Rate; D012123:Pulmonary Ventilation; D012016:Reference Values; D013147:Spirometry
chemical_list: D006371:Helium