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• W2103266410 abstract "Little is known of the vasomotor responses of skeletal muscle arterioles during and following muscle contraction. We hypothesized that aging leads to impaired arteriolar responses to muscle contraction and recovery. Nitric oxide (NO) availability, which is age dependent, has been implicated in components of these kinetics. Therefore, we also hypothesized that changes in the kinetics of vascular responses are associated with the NO pathway. Groups were young (3 mo), old (24 mo), endothelial NO synthase knockout (eNOS-/-), and N(G)-nitro-L-arginine (L-NA)-treated male and female C57BL/6 mice. The kinetics of vasodilation during and following 1 min of contractions of the gluteus maximus muscle were recorded in second-order (regional distribution) and third-order (local control) arterioles. Baseline, peak (during contraction), and maximal diameters (pharmacological) were not affected by age or sex. The kinetics of dilation and recovery were not different between males and females at the young age. There was a significant slowing of vasodilation at the onset of contractions (approximately 2-fold; P < 0.05) and a significant speeding of recovery ( approximately 5-fold; P < 0.05) in old males vs. old females and vs. young eNOS-/-, and L-NA did not affect the kinetics at the onset of muscle contraction. eNOS-/- mimicked the rapid recovery of old males in second-order arterioles; acute NO production (L-NA) explained approximately 50% of this effect. These data demonstrate fundamental age-related differences between the sexes in the dynamic function of skeletal muscle arterioles. Understanding how youthful function persists in females but not males may provide therapeutic insight into clinical interventions to maintain dynamic microvascular control of nutrient supply with age." @default.
• W2103266410 created "2016-06-24" @default.
• W2103266410 creator A5033671121 @default.
• W2103266410 date "2007-09-01" @default.
• W2103266410 modified "2023-09-27" @default.
• W2103266410 title "Advancing age produces sex differences in vasomotor kinetics during and after skeletal muscle contraction" @default.
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• W2103266410 doi "https://doi.org/10.1152/ajpregu.00213.2007" @default.
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