Investigations into changes of pulmonary function in the aged.
D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D001696:Biomechanical Phenomena; D004947:Esophagus; D005260:Female; D006371:Helium; D006801:Humans; D008297:Male; D010092:Oximetry; D011312:Pressure; D012119:Respiration / Q000502:physiology*; D012129:Respiratory Function Tests; D012212:Rheology; D013147:Spirometry
D006371:Helium