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Carbohydrate mouth rinsing has no effect on power output during cycling in a glycogen-reduced state
BACKGROUND: 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...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4842283/ https://www.ncbi.nlm.nih.gov/pubmed/27110224 http://dx.doi.org/10.1186/s12970-016-0131-1 |
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author | Ali, Ajmol Yoo, Michelle Ji Yeon Moss, Catherine Breier, Bernhard H. |
author_facet | Ali, Ajmol Yoo, Michelle Ji Yeon Moss, Catherine Breier, Bernhard H. |
author_sort | Ali, Ajmol |
collection | PubMed |
description | BACKGROUND: 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. |
format | Online Article Text |
id | pubmed-4842283 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-48422832016-04-25 Carbohydrate mouth rinsing has no effect on power output during cycling in a glycogen-reduced state Ali, Ajmol Yoo, Michelle Ji Yeon Moss, Catherine Breier, Bernhard H. J Int Soc Sports Nutr Research Article BACKGROUND: 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. BioMed Central 2016-04-23 /pmc/articles/PMC4842283/ /pubmed/27110224 http://dx.doi.org/10.1186/s12970-016-0131-1 Text en © Ali et al. 2016 Open AccessThis 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. |
spellingShingle | Research Article Ali, Ajmol Yoo, Michelle Ji Yeon Moss, Catherine Breier, Bernhard H. Carbohydrate mouth rinsing has no effect on power output during cycling in a glycogen-reduced state |
title | Carbohydrate mouth rinsing has no effect on power output during cycling in a glycogen-reduced state |
title_full | Carbohydrate mouth rinsing has no effect on power output during cycling in a glycogen-reduced state |
title_fullStr | Carbohydrate mouth rinsing has no effect on power output during cycling in a glycogen-reduced state |
title_full_unstemmed | Carbohydrate mouth rinsing has no effect on power output during cycling in a glycogen-reduced state |
title_short | Carbohydrate mouth rinsing has no effect on power output during cycling in a glycogen-reduced state |
title_sort | carbohydrate mouth rinsing has no effect on power output during cycling in a glycogen-reduced state |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4842283/ https://www.ncbi.nlm.nih.gov/pubmed/27110224 http://dx.doi.org/10.1186/s12970-016-0131-1 |
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