Key result
High-intensity interval exercise and moderate-intensity steady-state exercise similarly increased superficial femoral artery diameter (to 4.73 mm and 4.59 mm, respectively) in children.
Why the study?
The effect of exercise intensity on vasodilator function is poorly understood in children.
Does high-intensity interval exercise compared to moderate-intensity steady-state exercise affect postexercise vasodilation and shear patterns in 7- to 12-year-old children?
Does high-intensity interval exercise compared to moderate-intensity steady-state exercise affect postexercise vasodilation and shear patterns in 7- to 12-year-old children?
Acute bouts of external work-matched high-intensity interval exercise or moderate-intensity steady-state exercise exert a similar impact on shear-mediated conduit artery vasodilation and flow-mediated dilation in children.
Both exercise modes yield similar conduit artery dilation in children; extends acute vascular response data but leaves clinical translation open.
PURPOSE: The effect of exercise intensity on vasodilator function is poorly understood in children. The authors compared the acute effect of high-intensity interval exercise (HIIE) with moderate-intensity steady-state exercise (MISS) on postexercise vasodilation and shear patterns in 7- to 12- year-old children. METHODS: Superficial femoral artery diameter, shear rates, and flow-mediated dilation were measured pre, immediately following (post), and 1 hour after (post60) HIIE (six 1-min sprints at 90% peak power [Wmax], with 1-min recovery) and MISS (15 min at 44% Wmax). RESULTS: Baseline superficial femoral artery diameter increased similarly following both HIIE (pre 4.23 [0.41] mm, post 4.73 [0.56] mm) and MISS (pre 4.28 [0.56] mm, post 4.59 [0.64] mm), returning to preexercise values post60. Blood flow and antegrade shear rate were increased post HIIE and MISS, but to a greater extent, post HIIE (P < .05). Retrograde shear rate was attenuated post both exercise conditions and remained post60 (P < .001). There was a decline in flow-mediated dilation postexercise (HIIE Δ -2.9%; MISS Δ -2.4%), which was no longer apparent when corrected for baseline diameter. CONCLUSION: Acute bouts of external work-matched HIIE or MISS exert a similar impact on shear-mediated conduit artery vasodilation and flow-mediated dilation in children, and this is reversed 1 hour after exercise.
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McManus et al. (2019) studied this question. High-intensity interval exercise (HIIE) vs. Moderate-intensity steady-state exercise (MISS) was evaluated on Postexercise vasodilation and shear patterns (superficial femoral artery diameter, shear rates, and flow-mediated dilation). High-intensity interval exercise and moderate-intensity steady-state exercise similarly increased superficial femoral artery diameter (to 4.73 mm and 4.59 mm, respectively) in children.
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