Key result
Exercise snacks during prolonged sitting improve flow-mediated dilation and peripheral blood flow vs uninterrupted sitting.
Why the study?
Previous meta-analyses on exercise snacks during prolonged sitting were limited by small sample sizes and inadequate handling of statistical dependency from multiple effect sizes within studies.
Do short bouts of physical activity ('exercise snacks') improve acute hemodynamic and peripheral vascular outcomes compared to prolonged sitting in adults?
Population
632 participants across 36 studies of adults aged ≥ 18 years
Comparison
Sedentary breaks vs prolonged sitting
Design
Three-level random-effects meta-analysis of randomized crossover or parallel controlled trials
Authors
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Supports interrupting prolonged sitting with exercise snacks for better endothelial function; reinforces moderate-quality acute vascular benefits.
Meta-Analysis (n=632)
Randomized
Yes
Do short bouts of physical activity ('exercise snacks') improve acute hemodynamic and peripheral vascular outcomes compared to prolonged sitting in adults?
Effect estimate: Hedges' g 0.44 (95% CI 0.06-0.81)
p-value: p=0.02
Interrupting prolonged sitting with short bouts of physical activity acutely improves endothelial function (flow-mediated dilation) and peripheral blood flow while modestly reducing systolic blood pressure.
Wang et al. (2026) conducted a meta-analysis in Prolonged sitting (n=632). Exercise snacks (sedentary breaks) vs. Continuous uninterrupted sitting was evaluated on Flow-mediated dilation (FMD) (Hedges' g 0.44, 95% CI 0.06-0.81, p=0.02). Exercise snacks during prolonged sitting significantly improved flow-mediated dilation (Hedges' g 0.44) and peripheral blood flow compared to continuous uninterrupted sitting.
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