Opposition of Carbohydrate in a Mouth-Rinse Solution to the Detrimental Effect of Mouth Rinsing During Cycling Time Trials

Sep 7, 2012International journal of sport nutrition and exercise metabolism

How sugar in a mouth rinse may reduce the negative effects of mouth rinsing during cycling time trials

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Abstract

Cyclists completed time trials faster with a CHO mouth rinse (65.7 min) and no rinse (67.6 min) compared to rinsing with water (69.4 min).

Mouth rinsing with water is associated with decreased cycling performance compared to not rinsing.
CHO mouth rinsing may help mitigate performance decline seen with water rinsing.
Heart rate and perceived exertion levels did not differ significantly across the rinsing conditions.
The performance difference between CHO and no rinse approached significance.
This study raises questions about the impact of previous findings on CHO mouth rinsing that lacked a no-rinse comparison.

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Studies have reported that rinsing the mouth with a carbohydrate (CHO) solution improves cycling time-trial performance compared with rinsing with a placebo solution. However, no studies have compared the effect of mouth rinsing with a no-mouth-rinse control condition. The aim of this study was to compare the effects of a CHO mouth rinse with those of a placebo rinse and a no-rinse condition. Ten male cyclists completed three 1,000-kJ cycling time trials in a randomized, counterbalanced order. At every 12.5% of the time trial completed, participants were required to rinse their mouths for 5 s with either a 6.4% maltodextrin solution (CHO), water (WA), or no solution (CON). Heart rate and ratings of perceived exertion (RPE) were recorded every 25% of the time trial completed. Time to completion was faster in both CHO (65.7 ± 11.07 min) and CON (67.6 ± 12.68 min) than in WA (69.4 ± 13.81 min; p = .013 and p = .042, respectively). The difference between CHO and CON approached significance (p = .086). There were no differences in heart rate or RPE between any conditions. In summary, repeated mouth rinsing with water results in decreased performance relative to not rinsing at all. Adding CHO to the rinse solution appears to oppose this fall in performance, possibly providing additional benefits to performance compared with not rinsing the mouth at all. This brings into question the magnitude of the effect of CHO mouth rinsing reported in previous studies that did not include a no-rinse condition.

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Opposition of Carbohydrate in a Mouth-Rinse Solution to the Detrimental Effect of Mouth Rinsing During Cycling Time Trials

Abstract

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