Impact of acute dynamic exercise on radial artery low-flow mediated constriction in humans

European Journal of Applied Physiology
Robert O ElliottJames P Fisher

Abstract

A "low-flow mediated constriction" (L-FMC) is evoked in the radial artery by the inflation of an ipsilateral wrist cuff to a supra-systolic pressure. We sought to test the hypothesis that the radial artery L-FMC response is augmented immediately following acute dynamic leg exercise in young healthy individuals. Ten healthy and recreationally active men (23 ± 4 years) undertook a 30-min trial of incremental dynamic leg cycling exercise (10 min at 50, 100 and 150 W) and a 30-min time control trial (seated rest). Trials were randomly assigned and performed on separate days. Radial artery characteristics (diameter, blood flow and shear rate) were assessed throughout each trial, with L-FMC and flow-mediated vasodilatation (FMD) assessments conducted prior to and immediately following (10 min) trials. Dynamic leg cycling exercise increased radial artery blood flow, along with mean, retrograde and anterograde shear rate (P < 0.05). Blood flow profiles were unchanged during the time control trial (P > 0.05). Following exercise L-FMC was increased (mean [SD]; - 5.6 [3.3] vs. - 10.1 [3.8] %, P < 0.05), while it was not different in the time control condition (- 8.1 [3.2] vs. - 6.7 [3.4] %, P > 0.05). FMD was not different following eithe...Continue Reading

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