title: A Sucrose Mouth Rinse Does Not Improve 1-hr Cycle Time Trial Performance When Performed in the Fasted or Fed State.
abstract: Carbohydrate mouth rinsing during exercise has been suggested to enhance performance of short (45-60 min) bouts of high-intensity (>75% VO2peak) exercise. Recent studies indicate that this performance enhancing effect may be dependent on the prandial state of the athlete. The purpose of this study was to define the impact of a carbohydrate mouth rinse on ~1-hr time trial performance in both the fasted and fed states. Using a double-blind, crossover design, 14 trained male cyclists (27 ± 6 years; 5.0 ± 0.5 W · kg(-1)) were selected to perform 4 time trials of ~1 hr (1,032 ± 127 kJ) on a cycle ergometer while rinsing their mouths with a 6.4% sucrose solution (SUC) or a noncaloric sweetened placebo (PLA) for 5 s at the start and at every 12.5% of their set amount of work completed. Two trials were performed in an overnight fasted state and two trials were performed 2 h after consuming a standardized breakfast. Performance time did not differ between any of the trials (fasted-PLA: 68.6 ± 7.2; fasted-SUC: 69.6 ± 7.5; fed-PLA: 67.6 ± 6.6; and fed-SUC: 69.0 ± 6.3 min; Prandial State × Mouth Rinse Solution p = .839; main effect prandial state p = .095; main effect mouth rinse solution p = .277). In line, mean power output and heart rate during exercise did not differ between trials. In conclusion, a sucrose mouth rinse does not improve ~1-hr time trial performance in well-trained cyclists when performed in either the fasted or the fed state.
authors.affiliation: Dept. of Human Movement Sciences, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, the Netherlands.
authors.forename: Jorn
authors.initials: J
authors.lastname: Trommelen
authors.forename: Milou
authors.initials: M
authors.lastname: Beelen
authors.forename: Marjan
authors.initials: M
authors.lastname: Mullers
authors.forename: Martin J
authors.initials: MJ
authors.lastname: Gibala
authors.forename: Luc J C
authors.initials: LJ
authors.lastname: van Loon
authors.forename: Naomi M
authors.initials: NM
authors.lastname: Cermak
mesh_terms: D000328:Adult; D056352:Athletes; D054874:Athletic Performance / Q000502:physiology*; D001642:Bicycling / Q000502:physiology*; D062408:Breakfast; D018592:Cross-Over Studies; D004311:Double-Blind Method; D005080:Exercise Test; D005215:Fasting; D006339:Heart Rate; D006801:Humans; D008297:Male; D009067:Mouthwashes / Q000494:pharmacology*; D058573:Performance-Enhancing Substances / Q000494:pharmacology*; D064133:Sports Nutritional Physiological Phenomena; D013395:Sucrose / Q000008:administration & dosage / Q000494:pharmacology*; D055815:Young Adult
chemical_list: D009067:Mouthwashes; D058573:Performance-Enhancing Substances; D013395:Sucrose