A systematic review and meta-analysis of the effects of interrupting prolonged sitting with physical activity breaks on blood glucose, insulin, triacylglycerol
ISPAH ePoster Library. Loh R. Oct 16, 2018; 225276
Roland Loh
Roland Loh
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Abstract Introduction:<\b>
The aim was to systematically review and meta-analyse trials breaking up sitting with bouts of PA throughout the day (INT) compared with sitting (SIT), on glucose, insulin and triacylglycerol (TAG). Another aim was comparing the effects of INT against one bout of continuous exercise before or after sitting (EX), on glucose, insulin and TAG. Methods:<\b>
PRISMA recommendations were followed. PROSPERO Registration: CRD42017080982Eligibility: control trials comparing INT vs SIT, or INT vs EX, participants aged 18 or above, healthy, or with type 2 diabetes, but not with health conditions such as chronic obstructive pulmonary disease or peripheral arterial disease. Results:<\b>
INT vs SIT: For glucose, SMD of -0.60 [-0.81, -0.39] in favour of INT. For insulin, SMD of -0.69 [-0.98, -0.41] in favour of INT. For TAG, SMD of -0.27 [-0.44, -0.09] in favour of INT. BMI was associated with glucose responses (β= -.064, 95% CI: -0.123, -0.005, p= .034), but not insulin (β= -.066, -0.152, 0.02, p=.122), nor TAG (β= .010, -.048, .067, p= .722)INT vs EX: When energy expenditure matched, SMD of -0.36 [-0.65, -0.06] (p=0.02) in favour of INT only on glucose. No significant effect for other comparisons.DiscussionThere was publication bias for TAG. PA breaks moderately attenuated post-prandial glucose, insulin, and TAG, with greater glycaemic attenuation in people with higher BMI, but differences compared to one continuous bout of exercise are small, for glucose when protocols are energy matched, or non-existent for insulin and TAG. Therefore, PA breaks attenuate markers of metabolic health.
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