Glucose and fructose hydrogel enhances running performance, exogenous carbohydrate oxidation, and gastrointestinal tolerance

Journal article

Rowe, Joshua T., King, Roderick F. G. J., King, Andy J., Morrison, Douglas J., Preston, Thomas, Wilson, Oliver J. and O'Hara, John P.. (2022). Glucose and fructose hydrogel enhances running performance, exogenous carbohydrate oxidation, and gastrointestinal tolerance. Medicine and Science in Sports and Exercise. 54(1), pp. 129-140. https://doi.org/10.1249/MSS.0000000000002764
AuthorsRowe, Joshua T., King, Roderick F. G. J., King, Andy J., Morrison, Douglas J., Preston, Thomas, Wilson, Oliver J. and O'Hara, John P.
Abstract

Purpose
Beneficial effects of carbohydrate (CHO) ingestion on exogenous CHO oxidation and endurance performance require a well-functioning gastrointestinal (GI) tract. However, GI complaints are common during endurance running. This study investigated the effect of a CHO solution-containing sodium alginate and pectin (hydrogel) on endurance running performance, exogenous and endogenous CHO oxidation, and GI symptoms.

Methods
Eleven trained male runners, using a randomized, double-blind design, completed three 120-min steady-state runs at 68% V˙O2max, followed by a 5-km time-trial. Participants ingested 90 g·h−1 of 2:1 glucose–fructose (13C enriched) as a CHO hydrogel, a standard CHO solution (nonhydrogel), or a CHO-free placebo during the 120 min. Fat oxidation, total and exogenous CHO oxidation, plasma glucose oxidation, and endogenous glucose oxidation from liver and muscle glycogen were calculated using indirect calorimetry and isotope ratio mass spectrometry. GI symptoms were recorded throughout the trial.

Results
Time-trial performance was 7.6% and 5.6% faster after hydrogel ([min:s] 19:29 ± 2:24, P < 0.001) and nonhydrogel (19:54 ± 2:23, P = 0.002), respectively, versus placebo (21:05 ± 2:34). Time-trial performance after hydrogel was 2.1% faster (P = 0.033) than nonhydrogel. Absolute and relative exogenous CHO oxidation was greater with hydrogel (68.6 ± 10.8 g, 31.9% ± 2.7%; P = 0.01) versus nonhydrogel (63.4 ± 8.1 g, 29.3% ± 2.0%; P = 0.003). Absolute and relative endogenous CHO oxidation was lower in both CHO conditions compared with placebo (P < 0.001), with no difference between CHO conditions. Absolute and relative liver glucose oxidation and muscle glycogen oxidation were not different between CHO conditions. Total GI symptoms were not different between hydrogel and placebo, but GI symptoms were higher in nonhydrogel compared with placebo and hydrogel (P < 0.001).

Conclusion
The ingestion of glucose and fructose in hydrogel form during running benefited endurance performance, exogenous CHO oxidation, and GI symptoms compared with a standard CHO solution.

Keywords13c tracer; time trial; encapsulation; metabolism; endurance
Year2022
JournalMedicine and Science in Sports and Exercise
Journal citation54 (1), pp. 129-140
PublisherLippincott Williams & Wilkins
ISSN0195-9131
Digital Object Identifier (DOI)https://doi.org/10.1249/MSS.0000000000002764
Scopus EID2-s2.0-85119965684
Open accessPublished as green open access
Page range129-140
FunderLeeds Beckett University
Author's accepted manuscript
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Open
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All rights reserved
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Controlled
Output statusPublished
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OnlineJan 2022
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Deposited20 Feb 2023
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