Greater arterial wall viscosity in endurance-trained men.

Abstract

The age-associated increase in arterial wall viscosity (AWV) is attenuated by high cardiorespiratory fitness level. However, AWV in endurance-trained athletes have not been determined. We designed a cross sectional study to compare central AWV and compliance between endurance-trained young athletes and age-matched control men. Twenty-one endurance-trained men (age 20.7 ± 0.3years) and 20 age-matched healthy control men (age 21.6 ± 0.4years) were studied. The common carotid artery was measured noninvasively by tonometry and automatic tracking of B-mode images to obtain instantaneous pressure and diameter hysteresis loops, and we calculated the dynamic carotid arterial compliance, static (effective and isobaric) compliance, and viscosity index. The AWV index in the endurance-trained men was larger than the control peers (2285 ± 181 vs. 1429 ± 124mmHg·s/mm: P < 0.001). In addition, dynamic and static compliance were not statistically different between both groups. The present study indicated that the central AWV in endurance-trained athletes was greater than age-matched healthy control men. We believe that the AWV, as well as arterial compliance, is an important element for assessing vascular adaptation to endurance training.