Duration of the Hemodynamic Effects of 6 Weeks Repeated Moderate Aerobic Exercise after Its Cessation

Midori Tanaka, Motoaki Sugawara, Yasuo Ogasawara, Tadafumi Izumi, Kiyomi Niki, Fumihiko Kajiya

Abstract

Purpose: We investigated changes in hemodynamic parameters at one-week intervals for 6 weeks after the cessation of the aerobic exercise. Methods: A total of 20 young healthy volunteers were recruited. Using ultrasonic diagnostic equipment, we measured wave intensity (WI) in the carotid artery. The maximum value of WI during a cardiac cycle (W1) increases with an increase in Peak dP/dt. The exercise sessions were 30 min in duration on the bicycle ergometer. Subjects were asked to make an effort to maintain the heart rate during the session at anaerobic threshold (AT) point determined during the pre-exercise cardiopulmonary exercise testing (CPET). Exercise sessions were conducted three times per week over a period of 6 weeks, and then stopped. After the cessation of the exercise sessions, WI was measured during CPET at one-week intervals for six weeks. Results: The work rate (WR) at AT point and at RC point, VO2 at RC point increased and remained increased significantly up to 2 weeks after the cessation of the exercise. Oxygen consumption (VO2) at AT point also increased, but remained increased significantly only up to 1 week after. RC point W1 increased and remained increased significantly up to 1 week after.

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