1 From Clinical Physiology Laboratory, Department of Internal Medicine, Medical Center, and Biostatistics and Data Analysis (Dr. Whitlock), School of Public Health, University of Michigan, Ann Arbor, Michigan.
Respiratory and hemodynamic measurements were made on 54 sedentary subjects during progressive exercise on a bicycle ergometer up to the point of maximal voluntary effort. The age range of the group was from 18 to 68 years. The maximum tolerated exercise, as indicated by the highest achieved level of oxygen consumption (Voo2), diminished with age. Older subjects had a lower resting cardiac output (Q) than normal subjects, but an identical increase in Q with Voo2. There was no evidence of flattening of this curve as the older subjects approached highest exercise loads. Consequently, the arteriovenous oxygen difference did not increase abnormally on high loads, and the cardiac response to exercise in older subjects appeared to be adequate. The relationship between inspired air volume and heart rate with Voo2 at submaximal loads was not influenced by age. Systolic pressure increased progressively with exercise and showed a greater change in older subjects. Total peripheral resistance at rest increased with age; but with increasing exercise, this difference progressively diminished.
© 1967 American Heart Association, Inc.
Influence of Age on the Hemodynamic Response to Exercise
Key Words: Cardiac output • Heart rate • Arterial pressure • Oxygen consumption • Total peripheral resistance • Pulmonary ventilation
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