Carbohydrate Mouth Rinsing in the Fed State: Lack of Enhancement of Time-Trial Performance

M Beelen, J Berghuis, B Bonaparte, SB Ballak, Asker Jeukendrup, LJC van Loon

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

It has been reported previously that mouth rinsing with a carbohydrate-containing solution can improve cycling performance. The purpose of the current study was to investigate the impact of such a carbohydrate month rinse on exercise performance during a simulated time trial in a more practical, postprandial setting. Fourteen male endurance-trained athletes were selected to perform 2 exercise tests in the morning after consuming a standardized breakfast. They performed an similar to 1-hr time trial on a cycle ergometer while rinsing their mouths with either a 6.4% maltodextrin solution (CHO) or water (PLA) after every 12.5% of the set amount of work. Borg's rating of perceived exertion (RPE) was assessed after every 25% of the set amount of work. and power output and heart rate were recorded continuously throughout the test. Performance time did not differ between treatments and averaged 68.14 +/- 1.14 and 67.52 +/- 1.00 min in CHO and PLA, respectively (p = .57). In accordance, average power Output (265 +/- 5 vs. 266 +/- 5 W, p = .58), heart rate (169 +/- 2 vs. 168 +/- 2 beats/min, p = .43), and RPE (16.4 +/- 0.3 vs. 16.7 +/- 0.3 W, p = .26) did not differ between treatments. Furthermore, after dividing the trial into 8s, no differences in power output, heart rate, or perceived exertion were observed over time between treatments. Carbohydrate mouth rinsing does not improve time-trial performance when exercise is performed in a practical, postprandial setting.
Original languageEnglish
Pages (from-to)400-409
Number of pages10
JournalInternational journal of sport nutrition and exercise metabolism
Volume19
Issue number4
Publication statusPublished - 1 Aug 2009

Keywords

  • cycling
  • exercise
  • maltodextrin
  • mouthwash

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