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No dose response effect of carbohydrate mouth rinse on cycling time-Trial performance

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posted on 04.07.2017 by Ruth M. James, Sarah Ritchie, Ian Rollo, Lewis James
© 2017 Human Kinetics, Inc. The aim of the current study was to investigate the influence of mouth rinsing carbohydrate at increasing concentrations on ~1 hr cycle time trial performance. Eleven male cyclists completed three experimental trials, following an overnight fast. Cyclists performed a ~1 hr time trial on a cycle ergometer, while rinsing their mouth for 5 s with either a 7% maltodextrin solution (CHO), 14% CHO or a taste-matched placebo (PLA) after every 12.5% of the set amount of work. Heart rate was recorded every 12.5% of the time trial, while RPE and GI comfort were determined every 25% of the time trial. The mouth rinse protocol influenced the time to complete the time trial (p < .001), with cyclists completing the time trial faster during 7% CHO (57.3 ± 4.5 min; p = .004) and 14% CHO (57.4 ± 4.1 min; p = .007), compared with PLA (59.5 ± 4.9 min). There was no difference between the two carbohydrate trials (p = .737). There was a main effect of time (P<0.001) for both heart rate and RPE, but no main effect of trial (p = .107 and p = .849, respectively). Scores for GI comfort ranged from 0-2 during trials, indicating very little GI discomfort during exercise. In conclusion, mouth rinsing and expectorating a 7% maltodextrin solution, for 5 s routinely during exercise was associated with improved cycle time trial performance approximately 1 h in duration. Increasing the carbohydrate concentration of the rinsed solution from 7% to 14% resulted in no further performance improvement.

History

School

  • Sport, Exercise and Health Sciences

Published in

International Journal of Sport Nutrition and Exercise Metabolism

Volume

27

Issue

1

Pages

25 - 31

Citation

JAMES, R.M. ...et al., 2017. No dose response effect of carbohydrate mouth rinse on cycling time-Trial performance. International Journal of Sport Nutrition and Exercise Metabolism, 27(1), pp. 25-31.

Publisher

© Human Kinetics

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2017-01-31

Notes

Accepted author manuscript version reprinted, by permission, from International Journal of Sport Nutrition and Exercise Metabolism, 27(1), pp. 25-31, http://dx.doi.org/10.1123/ijsnem.2016-0111. © Human Kinetics, Inc.

ISSN

1526-484X

eISSN

1543-2742

Language

en

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