Leg vascular function with advancing age in men: The impact of physical activity and endurance exercise training.

Abstract

Regular physical activity and endurance exercise training prevent age-related vascular endothelial dysfunction in the arm in men. However, the effects of physical activity and/or endurance exercise training in the legs, which have a greater predisposition for vascular disease, has not been completely elucidated. This study sought to examine the impact of aging, physical activity, and endurance exercise training on leg vascular function in men. Flow-mediated dilation (FMD) of the superficial femoral and popliteal arteries (SFA and PA, respectively) was assessed in a total of 39 men, comprised of 10 young sedentary (Y; 23±2 yrs), 8 older sedentary (OS; 76±8 yrs), 9 older physically active (OA; 71±8 yrs), and 12 older endurance exercise trained (OT) subjects with exceptional aerobic exercise capacity (V̇O_2max) for their age (70±3 yrs, V̇O_2max=53±6 ml·kg^-1·min^-1). FMD was lower in the OS group compared with the Y in the SFA (Y: 4.3±2.1%, OS:1.7±1.0%, p=0.005) and PA (Y: 5.8±2.4% OS: 1.9±1.1%, p<0.05). SFA and PA FMD were not different from OS in the OA group (SFA: 2.8±1.5%; PA: 1.6±1.0%), but were higher than OS in the OT group (SFA: 3.4±2.3%, P=0.043; PA: 4.2±3.0%, P=0.025) and not different from Y. There was evidence of a moderate-strong correlation between SFA (r=0.32, P=0.052) and PA (0.36, p=0.037) FMD and V̇O_2max but not physical activity levels. These findings suggest that habitual physical activity in general, and endurance exercise training in particular, diminish the detrimental effect of aging on lower limb vascular function in men and this may be linked to an augmented V̇O_2max.