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Effect of increased physical activity on fructose-induced glycemic response in healthy individuals

Bidwell, A.J., Fairchild, T.J.ORCID: 0000-0002-3975-2213, Wang, L., Keslacy, S. and Kanaley, J.A. (2014) Effect of increased physical activity on fructose-induced glycemic response in healthy individuals. European Journal of Clinical Nutrition, 68 . pp. 1048-1054.

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Background/Objectives: The purpose of the current study was to determine whether increased physical activity (PA) altered glycemic control while ingesting an energy-balanced high-fructose diet.

Subjects/Methods: Twenty-two normal-weight men and women (age: 21.2±0.6 years; body mass index: 22.6 ±0.6 kg/m2) participated in a randomized, cross-over design study in which they ingested an additional 75 g of fructose for 14 days while either maintaining low PA (FR+inactive) (<4500 steps/day) or high PA (FR+active) (>12 000 steps/day). Before and following the 2-week loading period, a fructose-rich meal challenge was administered and blood was sampled at baseline and for 6 h after the meal and analyzed for glucagon-like peptide-1 (GLP-1), glucose-dependent insulinotropic peptide (GIP), c-peptide, glucose and insulin concentrations.

Results: Plasma insulin, glucose, c-peptide, GIP and GLP-1 concentrations significantly increased in response to the test meal on all test visits (P<0.05). C-peptide incremental area under the curve (AUC) decreased by 10 208 ±120 pmol/l × min for 6 h from pre to post Fr+active intervention (P=0.02) leading to a decrease in plasma insulin total AUC (pre: 58 470.2±6261.0 pmol/l; post: 49 444.3±3883.0 pmol/l; P=0.04) resulting in a decrease Δpeak[Insulin] (P=0.009). Following the FR+active intervention, GIP total AUC significantly decreased (P=0.005) yet only males had a lower total GLP-1 AUC after both interventions (P=0.049). There were no sex differences in GIP levels.

Conclusions: Increased PA attenuates the deleterious effects on glycemic control caused by a high-fructose diet. These changes in glycemic control with PA are associated with decreases in insulin and GIP concentrations.

Item Type: Journal Article
Murdoch Affiliation: School of Psychology and Exercise Science
Publisher: Macmillan Publishers Limited.
Copyright: © 2014 Macmillan Publishers Limited
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