Arterial compliance increases after moderate-intensity cycling.
Exercise training elevates arterial compliance at rest, but the effects of acute exercise in this regard are unknown. This study investigated the effects of a single, 30-min bout of cycling exercise at 65% of maximal oxygen consumption on indexes of arterial compliance. Whole body arterial compliance determined noninvasively from simultaneous measurements of aortic flow and carotid pressure was elevated (66 +/- 26%) at 0.5 h postexercise (P = 0.04), followed by a decline to baseline 1 h after exercise. Aortic pulse-wave velocity, which is inversely related to compliance, was reduced (4 +/- 2%; P = 0.04) at 0.5 h postexercise. Pulse-wave velocity in the leg decreased by 10 +/- 4% at this time (P = 0.01). Mean arterial pressure was unchanged; however, central systolic blood pressure was reduced postexercise (P = 0.03). Cardiac output was elevated after exercise (P = 0.007) via heart rate elevation (P = 0.001), whereas stroke volume was unchanged. Total peripheral resistance was therefore reduced (P = 0.01) and would be expected to contribute to an elevation in arterial compliance. In conclusion, a single bout of cycling exercise increased whole body arterial compliance by mechanisms that may relate to vasodilation.
Kingwell
B A
BA
Alfred and Baker Medical Unit, Baker Medical Research Institute, Prahran, Australia.
Berry
K L
KL
Cameron
J D
JD
Jennings
G L
GL
Dart
A M
AM
D000328:Adult; D001011:Aorta / Q000502:physiology*; D001794:Blood Pressure / Q000502:physiology*; D001809:Blood Viscosity; D002302:Cardiac Output; D002339:Carotid Arteries / Q000502:physiology*; D002784:Cholesterol / Q000097:blood; D008076:Cholesterol, HDL / Q000097:blood; D003187:Compliance; D003971:Diastole; D006339:Heart Rate; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D005082:Physical Exertion / Q000502:physiology*; D013318:Stroke Volume; D013599:Systole; D014280:Triglycerides / Q000097:blood; D014655:Vascular Resistance
D008076:Cholesterol, HDL; D014280:Triglycerides; D002784:Cholesterol