Ankle Blood Pressure Response to Graded Treadmill Exercise

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Abstract
Fifteen normal subjects were tested using 3 stages of graded treadmill exercise to evaluate the changes in heart rate, arm blood pressure and ankle systolic blood pressure. The 3 periods of exercise included: Stage I, 1.7 mph, 10% grade; Stage I + n, II was 3.4 mph, 15% grade; Stage I + II + III, III was 5 mph, 18% grade. Stage I exercise was performed by all subjects with minimal changes in all parameters. Successive stages were accompanied by marked increases in heart rate and arm systolic pressure and a fall in the systolic blood pressure measured at the ankle. In the 6 subjects that were unable to complete all 3 stages of exercise, the ankle pressure decrease occurred at the lower work load level than in those subjects that completed all stages. The ankle pressure decrease that was observed in the normal subjects was directionally the same as seen in patients with intermittent claudication but required a much greater work load to produce the response.

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