Key result
Acute dynamic leg cycling exercise significantly augmented radial artery low-flow mediated constriction to -10.1% compared to -6.7% in the resting control condition in young healthy men.
Why the study?
Does acute dynamic leg cycling exercise augment radial artery low-flow mediated constriction in young healthy men?
RCT (n=10)
Single-blind
Randomly assigned
No
Does acute dynamic leg cycling exercise augment radial artery low-flow mediated constriction in young healthy men?
Absolute Event Rate: -10.1% vs -6.7%
p-value: p=<0.05
Dynamic exercise with a large muscle mass acutely augments the vasoconstrictor response of the radial artery to a reduction in blood flow (L-FMC) in young healthy individuals.
No immediate clinical implications for patients; extends evidence on acute exercise effects on conduit artery vasoconstriction.
PURPOSE: 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. METHODS: 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. RESULTS: 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 either the exercise or time control trials (P > 0.05), but the composite end-point of L-FMC + FMD was enhanced post-exercise (P < 0.05). CONCLUSIONS: Dynamic exercise with a large muscle mass acutely augments the vasoconstrictor response of the radial artery in response to a reduction in blood flow (L-FMC) in young healthy individuals. The time course of this post-exercise response and the underlying vasoregulatory mechanisms require elucidation.
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Elliott et al. (2018) conducted an RCT in Healthy (n=10). Acute dynamic leg cycling exercise vs. Time control trial (seated rest) was evaluated on Radial artery low-flow mediated constriction (L-FMC) immediately following trial (p=<0.05). Acute dynamic leg cycling exercise significantly augmented radial artery low-flow mediated constriction to -10.1% compared to -6.7% in the resting control condition in young healthy men.
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