Key result
Physical activity breaks of any intensity prevent sitting-induced vascular decline and improve FMD by ~0.5%.
Why the study?
Vascular benefits of physical activity breaks with varied frequency and duration have emerged, but the efficacy of varied break intensity remained unexplored.
Do physical activity breaks of various intensities improve regional vascular outcomes during prolonged sitting?
Do physical activity breaks of various intensities improve regional vascular outcomes during prolonged sitting?
Physical activity breaks of any intensity, particularly low-intensity breaks, mitigate the adverse vascular effects of prolonged sitting by improving endothelial function and reducing arterial stiffness.
Answers are grounded in this paper and cite their sources.
Supports interrupting prolonged sitting with activity breaks to protect endothelial function; extends evidence across intensities via Level 1 synthesis.
Emerging evidence claims the vascular benefits of varied frequency and duration of physical activity (PA) breaks, whereas the efficacy of varied intensity remains unexplored. We aimed to collate and summate the studies investigating the PA breaks at various intensities on vascular protection. Seven electronic databases were searched for potential studies till Jan 31, 2022. The eligible studies should have administered PA breaks of differing intensities in prolonged sitting postures and explored regional vascular changes [flow mediated dilation (FMD), shear stress, diameter, and blood flow] using ultrasound and novel outcome markers. Two independent reviewers assessed the studies for eligibility after abstract and full-text screen, and appropriate data were extracted to summarise vascular protective effects with PA breaks. Our findings reveal adverse regional vascular outcomes with prolonged sitting (FMD ≈ –1.5%, diameter ≈ –0.06 mm), whereas PA breaks of any intensity were found to improve endothelial functions (FMD ≈ +0.5%, diameter ≈ +0.1 mm, shear ≈ +13 s -1 ) and mitigate the adverse effects associated with prolonged sitting. Compared with high-intensity activity, low-intensity PA breaks alleviate arterial stiffness and endothelial dysfunction risks.
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P et al. (2024) conducted a review in Prolonged sitting. Physical activity breaks vs. Prolonged sitting was evaluated on Regional vascular changes (flow mediated dilation, shear stress, diameter, and blood flow). Physical activity breaks of any intensity during prolonged sitting improved endothelial functions and mitigated adverse vascular effects compared to prolonged sitting.
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