Comparison of exercise responses in old and young men. II. Ventilatory mechanics.
D000293:Adolescent; D000368:Aged; D000375:Aging; D006801:Humans; D008297:Male; D008875:Middle Aged; D005082:Physical Exertion; D010809:Physical Fitness; D012119:Respiration; D012129:Respiratory Function Tests; D014692:Ventilation-Perfusion Ratio