Volume 12 Supplement 1

Proceedings of the Twelfth International Society of Sports Nutrition (ISSN) Conference and Expo

Open Access

Effect of post-exercise ingestion of different molecular weight carbohydrate solutions. Part II: The incretin response

  • Anthony J Anzalone1,
  • Anthony L Almada2,
  • Leighsa E Van Eck1,
  • Margaret T Jones3,
  • Andrew R Jagim4,
  • Joel B Mitchell1,
  • Meena Shah1 and
  • Jonathan M Oliver1
Journal of the International Society of Sports Nutrition201512(Suppl 1):P31

https://doi.org/10.1186/1550-2783-12-S1-P31

Published: 21 September 2015

Background

Gastric inhibitory peptide (GIP) and glucagon like peptide-1 (GLP-1), incretin hormones of the small intestine, are secreted in response to the presence of food in the lumen. Once released into circulation, these incretins stimulate beta cells to increase insulin secretion, accounting for at least 50% of total insulin secreted after glucose ingestion. Post-exercise ingestion of a high molecular weight (HMW) carbohydrate (CHO) solution has been shown to result in greater rates of muscle glycogen synthesis, which are attributed to the higher rates of gastric emptying, compared to a low molecular weight (LMW) CHO solution. However, no studies have examined the effect of post-exercise ingestion of CHO's of differing molecular weights on incretin response. Therefore, we sought to examine the difference in GIP and GLP-1 secretion after ingestion of HMW and LMW CHO solutions following a glycogen depleting exercise bout.

Methods

Sixteen resistance trained men (mean ± SD; 23 ± 3 years; 176.7 ± 9.8 cm; 88.2 ± 8.6 kg; 12.1 ± 5.6 % fat) participated in this double-blind, placebo-controlled, randomized cross over study, which consisted of three testing sessions, each separated by one week. VO2 max (37.4 ± 4.3 ml·kg·min-1) was determined prior to testing session 1. In sessions 1-3, subjects completed a glycogen depleting cycling bout of 60 minutes at 70% VO2 max, followed by six, one-minute sprints at 120% VO2 max. Immediately post-exercise, subjects ingested a placebo (PLA), or a LMW or HMW CHO solution (10%) providing 1.2 kg· bw-1 CHO, assigned randomly. Blood was sampled prior to ingestion and every ten minutes for 120 minutes post-ingestion. A two-factor repeated measures ANOVA was used to determine differences among treatments (p ≤ 0.05).

Results

A time × treatment effect was observed in both GIP (p < 0.001) and GLP-1 (p < 0.001). Ingestion of both HMW and LMW solutions caused a sharp increase in GLP-1 and GIP, resulting in significantly higher values compared to those observed following ingestion of PLA. By 10 minutes both GIP (LMW, 146.7 ± 6.5 pg·mL-1; HMW, 129.7 ± 23.7 pg·mL-1) and GLP-1 (LMW, 13.1 ± 3.3 pg·mL-1; HMW, 13.2 ± 3.3 pg·mL-1) were higher following ingestion of LMW and HMW compared to PLA (GIP, 35.1 ± 6.1 pg·mL-1; p ≤ 0.004; GLP-1, 2.1 ± 0.5 pg·mL-1; p ≤ 0.001). GIP increased progressively and remained elevated for the entirety of blood sampling (120 minutes) in both CHO conditions. Changes in GLP-1 were almost immediate, resulting in a trend, whereby GLP-1 values were elevated above PLA immediately post-ingestion in both LMW and HMW (p = 0.089 and p = 0.087, respectively). GLP-1 peaked at 40 minutes following ingestion of LMW (27.9 ± 3.5 pg·mL-1) and HMW (28.5 ± 5.1 pg·mL-1), then began to decline, remaining above PLA until 120 minutes. No differences were observed between HMW and LMW GIP or GLP-1 at any time point.

Conclusions

These data suggest ingestion of HMW and LMW solutions providing 1.2 kg· bw-1 CHO result in similar responses in the gut hormones GIP and GLP-1. Further study is needed to determine incretin's effect on subsequent insulin secretion and glucose disposal.

Declarations

Acknowledgements

This work was supported in part by Vitargo Global Sciences, LLC.

Authors’ Affiliations

(1)
Department of Kinesiology, Texas Christian University
(2)
Vitargo Global Sciences, LLC
(3)
Health and Human Performance Division, George Mason University
(4)
Exercise & Sport Science Department, University of Wisconsin - La Crosse

Copyright

© Anzalone et al. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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