title: A progressive exercise step test.
mesh_terms: D000328:Adult; D001991:Bronchitis / Q000503:physiopathology; D005080:Exercise Test; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000008:administration & dosage; D010101:Oxygen Consumption; D005082:Physical Exertion; D015203:Reproducibility of Results; D012129:Respiratory Function Tests
chemical_list: D010100:Oxygen