Carbohydrate Mouth Rinsing Has No Effect on Power Output During Cycling in a Glycogen-reduced State

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aut.relation.journalJournal of the International Society of Sports Nutritionen_NZ
aut.researcherYoo, Michelle
dc.contributor.authorAli, Aen_NZ
dc.contributor.authorYoo, Men_NZ
dc.contributor.authorMoss, Cen_NZ
dc.contributor.authorBreier, Ben_NZ
dc.date.accessioned2017-04-20T03:43:51Z
dc.date.available2017-04-20T03:43:51Z
dc.date.copyright2016en_NZ
dc.date.issued2016en_NZ
dc.description.abstractBackground: The effect of mouth rinsing with a carbohydrate (CHO) solution on exercise performance is inconclusive with no benefits observed in the fed state. This study examined the effect of CHO mouth rinse or CHO ingestion on performance in 9 moderately trained male cyclists. Methods: Four trials were undertaken, separated by 7 days, in a randomized, counterbalanced design. Each trial included a 90-min glycogen-reducing exercise protocol, immediately followed by a low CHO meal and subsequent overnight fast; the following morning a 1-h cycling time trial was conducted. The trials included 15 % CHO mouth rinse (CHOR), 7.5 % CHO ingestion (CHOI), placebo mouth rinse and placebo ingestion. Solutions were provided after every 12.5 % of completed exercise: 1.5 mL · kg−1 and 0.33 mL · kg−1 body mass during ingestion and rinse trials, respectively. During rinse trials participants swirled the solution for 8 s before expectorating. Blood samples were taken at regular intervals before and during exercise. Results: Performance time was not different between trials (P = 0.21) but the 4.5-5.2 % difference between CHOI and other trials showed moderate practical significance (Cohen’s d 0.57-0.65). Power output was higher in CHOI relative to other trials (P < 0.01). There were no differences between CHOR and placebo groups for any performance variables. Plasma glucose, insulin and lactate concentrations were higher in CHOI relative to other groups (P < 0.05). Conclusions: In a fasted and glycogen-reduced state ingestion of a CHO solution during high-intensity exercise enhanced performance through stimulation of insulin-mediated glucose uptake. The CHO mouth rinsing had neither ergogenic effects nor changes in endocrine or metabolic responses relative to placebo.
dc.identifier.citationJournal of the International Society of Sports Nutrition, 13(1), 19.
dc.identifier.doi10.1186/s12970-016-0131-1en_NZ
dc.identifier.issn1550-2783en_NZ
dc.identifier.urihttp://hdl.handle.net/10292/10432
dc.publisherBioMed Central
dc.rights© 2016 Ali et al. Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.
dc.rights.accessrightsOpenAccessen_NZ
dc.subjectErgogenic aid; Fluid ingestion; Time trial; Sports drink; Mouthwash; Supplementation
dc.titleCarbohydrate Mouth Rinsing Has No Effect on Power Output During Cycling in a Glycogen-reduced Stateen_NZ
dc.typeJournal Article
pubs.elements-id203070
pubs.organisational-data/AUT
pubs.organisational-data/AUT/Health & Environmental Science
pubs.organisational-data/AUT/Health & Environmental Science/Applied Science
pubs.organisational-data/AUT/Health & Environmental Science/School of Science
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