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Ingesting a high-dose carbohydrate solution during the cycle section of a simulated Olympic-distance triathlon improves subsequent run performance
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (Swedish Winter Sports Research Centre)
Univ Bath, Dept Hlth, Human Physiol Res Grp, Bath BA2 7AY, Avon, England.
Univ Bath, Dept Hlth, Human Physiol Res Grp, Bath BA2 7AY, Avon, England.
2012 (English)In: Applied Physiology, Nutrition and Metabolism, ISSN 1715-5312, Vol. 37, no 4, 664-671 p.Article in journal (Refereed) Published
Abstract [en]

The well-established ergogenic benefit of ingesting carbohydrates during single-discipline endurance sports has only been tested once within an Olympic-distance (OD) triathlon. The aim of the present study was to compare the effect of ingesting a 2:1 maltodextrin/fructose solution with a placebo on simulated OD triathlon performance. Six male and 4 female amateur triathletes (age, 25 ± 7 years; body mass, 66.8 ± 9.2 kg; peak oxygen uptake, 4.2 ± 0.6 L·min–1) completed a 1500-m swim time-trial and an incremental cycle test to determine peak oxygen uptake before performing 2 simulated OD triathlons. The swim and cycle sections of the main trials were of fixed intensities, while the run section was completed as a time-trial. Two minutes prior to completing every quarter of the cycle participants consumed 202 ± 20 mL of either a solution containing 1.2 g·min–1 of maltodextrin plus 0.6 g·min–1 of fructose at 14.4% concentration (CHO) or a sugar-free, fruit-flavored drink (PLA). The time-trial was 4.0% ± 1.3% faster during the CHO versus PLA trial, with run times of 38:43 ± 1:10 min:s and 40:22 ± 1:18 min:s, respectively (p = 0.010). Blood glucose concentrations were higher in the CHO versus PLA trial (p < 0.001), while perceived stomach upset did not differ between trials (p = 0.555). The current findings show that a 2:1 maltodextrin/fructose solution (1.8 g·min–1 at 14.4%) ingested throughout the cycle section of a simulated OD triathlon enhances subsequent 10-km run performance in triathletes.

Place, publisher, year, edition, pages
2012. Vol. 37, no 4, 664-671 p.
Keyword [en]
exercise, metabolism, fructose, glucose, maltodextrin, gastrointestinal discomfort, carbohydrate, sports nutrition, athlete performance
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-16376DOI: 10.1139/h2012-040ISI: 000306110700008Scopus ID: 2-s2.0-84863760345OAI: oai:DiVA.org:miun-16376DiVA: diva2:531608
Available from: 2012-06-07 Created: 2012-06-07 Last updated: 2012-09-26Bibliographically approved

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