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Randomized Controlled Trial
. 2016 May 9;8(5):269.
doi: 10.3390/nu8050269.

Mouth Rinsing with Maltodextrin Solutions Fails to Improve Time Trial Endurance Cycling Performance in Recreational Athletes

Tuğba Nilay Kulaksız  1   2 , Şükran Nazan Koşar  3 , Suleyman Bulut  4 , Yasemin Güzel  5 , Marcus Elisabeth Theodorus Willems  6 , Tahir Hazir  7 , Hüseyin Hüsrev Turnagöl  8
Affiliations
Randomized Controlled Trial

Mouth Rinsing with Maltodextrin Solutions Fails to Improve Time Trial Endurance Cycling Performance in Recreational Athletes

Tuğba Nilay Kulaksız et al. Nutrients. .

Abstract

The carbohydrate (CHO) concentration of a mouth rinsing solution might influence the CHO sensing receptors in the mouth, with consequent activation of brain regions involved in reward, motivation and regulation of motor activity. The purpose of the present study was to examine the effects of maltodextrin mouth rinsing with different concentrations (3%, 6% and 12%) after an overnight fast on a 20 km cycling time trial performance. Nine recreationally active, healthy males (age: 24 ± 2 years; V ˙ O 2 m a x : 47 ± 5 mL·kg(-1)·min(-1)) participated in this study. A double-blind, placebo-controlled randomized study was conducted. Participants mouth-rinsed every 2.5 km for 5 s. Maltodextrin mouth rinse with concentrations of 3%, 6% or 12% did not change time to complete the time trial and power output compared to placebo (p > 0.05). Time trial completion times were 40.2 ± 4.0, 40.1 ± 3.9, 40.1 ± 4.4, and 39.3 ± 4.2 min and power output 205 ± 22, 206 ± 25, 210 ± 24, and 205 ± 23 W for placebo, 3%, 6%, and 12% maltodextrin conditions, respectively. Heart rate, lactate, glucose, and rating of perceived exertion did not differ between trials (p > 0.05). In conclusion, mouth rinsing with different maltodextrin concentrations after an overnight fast did not affect the physiological responses and performance during a 20 km cycling time trial in recreationally active males.

Keywords: cycling; endurance performance; maltodextrin solution; mouth rinse.

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Figures

Figure 1
Figure 1
Outline of tests and testing procedures. MD: maltodextrin, RPE: rating of perceived exertion.
Figure 2
Figure 2
Percentages of HRmax (A); Wmax (B), achieved and 20 km time trial times (C). MD, maltodextrin. HRmax, maximum heart rate. Wmax, maximum cycling power.
Figure 3
Figure 3
Heart rate (A); blood glucose (B); and blood lactate (C) as a function of cycled distance. MD, maltodextrin.
Figure 4
Figure 4
RPE (A), mean power (B); and time to complete distance intervals (C) as a function of cycled distance. MD, maltodextrin. RPE, rating of perceived exertion.
See this image and copyright information in PMC

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