HIGH-INTENSITY INTERVAL CYCLING EXERCISE ON WAVE REFLECTION AND PULSE WAVE VELOCITY

The purpose of this study was to assess the effects of high-intensity exercise on wave reflection and aortic stiffness. Nine young, healthy men (mean SD: age: 22 2 years) participated in the study. The high-intensity interval cycling exercise consisted of 3 sets of Wingate Anaerobic Tests (WATs) with 7.5% of bodyweight as resistance and 2 minutes of rest between each set. Measurements were taken at rest and 1 minute after completion of the WATs. Brachial and aortic blood pressures, as well as wave reflection characteristics, were measured through pulse wave analysis. Aortic stiffness was assessed through carotid-femoral pulse wave velocity (cfPWV). A repeated-measures analysis of variance was used to investigate the effects of the WATs on blood pressure and vascular function across time. There was no change in brachial or aortic systolic pressure from rest to recovery. There was a significant (p <= 0.05) decrease in brachial diastolic pressure (rest: 73 6 mm Hg; recovery: 67 9 mm Hg) and aortic diastolic pressure (rest: 75 6 mm Hg; recovery: 70 9 mm Hg) from rest to recovery. In addition, there was no significant change in the augmentation index (rest: 111.4 6.5%; recovery: 109.8 5.8%, p = 0.65) from rest to recovery. However, there was a significant (p <= 0.05) increase in the augmentation index normalized at 75 b.min(-1) (rest: 3.29 9.82; recovery 21.21 10.87) during recovery compared with rest. There was no change in cfPWV (rest: 5.3 0.8 m.s(-1); recovery: 5.7 0.5m.s(-1); p = 0.09) in response to the WAT. These data demonstrate that high-intensity interval cycling exercise with short rest periods has a nonsignificant effect on vascular function.