Effect of Increased Physical Activity on Fructose-Induced Glycemic Response in Healthy Individuals

Eur J Clin Nutr. 2014 Sep;68(9):1048-54. doi: 10.1038/ejcn.2014.90. Epub 2014 May 21.

Abstract

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/m(2)) 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.

Publication types

  • Randomized Controlled Trial
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Area Under Curve
  • Blood Glucose / metabolism*
  • C-Reactive Protein / metabolism*
  • Cross-Over Studies
  • Dietary Carbohydrates / metabolism
  • Dietary Carbohydrates / pharmacology
  • Exercise / physiology*
  • Female
  • Fructose / metabolism
  • Fructose / pharmacology*
  • Gastric Inhibitory Polypeptide / blood*
  • Glucagon-Like Peptide 1 / blood*
  • Humans
  • Insulin / blood*
  • Male
  • Postprandial Period
  • Reference Values
  • Sex Factors
  • Young Adult

Substances

  • Blood Glucose
  • Dietary Carbohydrates
  • Insulin
  • Fructose
  • Gastric Inhibitory Polypeptide
  • Glucagon-Like Peptide 1
  • C-Reactive Protein