title: Effect of a carbohydrate mouth rinse on simulated cycling time-trial performance commenced in a fed or fasted state.
abstract: It is presently unclear whether the reported ergogenic effect of a carbohydrate (CHO) mouth rinse on cycling time-trial performance is affected by the acute nutritional status of an individual. Hence, the aim of this study was to investigate the effect of a CHO mouth rinse on a 60-min simulated cycling time-trial performance commenced in a fed or fasted state. Twelve competitive male cyclists each completed 4 experimental trials using a double-blinded Latin square design. Two trials were commenced 2 h after a meal that contained 2.5 g·kg(-1) body mass of CHO (FED) and 2 after an overnight fast (FST). Prior to and after every 12.5% of total time during a performance ride, either a 10% maltodextrin (CHO) or a taste-matched placebo (PLB) solution was mouth rinsed for 10 s then immediately expectorated. There were significant main effects for both pre-ride nutritional status (FED vs. FST; p < 0.01) and CHO mouth rinse (CHO vs. PLB; p < 0.01) on power output with an interaction evident between the interventions (p < 0.05). The CHO mouth rinse improved mean power to a greater extent after an overnight fast (282 vs. 273 W, 3.4%; p < 0.01) compared with a fed state (286 vs. 281 W, 1.8%; p < 0.05). We concluded that a CHO mouth rinse improved performance to a greater extent in a fasted compared with a fed state; however, optimal performance was achieved in a fed state with the addition of a CHO mouth rinse.
authors: Exercise and Nutrition Research Group, School of Medical Sciences, RMIT University, Bundoora, VIC 3083, Australia.
authors: Stephen C
authors: SC
authors: Lane
authors: Stephen R
authors: SR
authors: Bird
authors: Louise M
authors: LM
authors: Burke
authors: John A
authors: JA
authors: Hawley
mesh_terms: D000328:Adult; D054874:Athletic Performance / Q000502:physiology*; D001642:Bicycling / Q000502:physiology*; D001786:Blood Glucose; D002241:Carbohydrates / Q000008:administration & dosage*; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004734:Energy Metabolism / Q000502:physiology; D005508:Food Deprivation; D006801:Humans; D008297:Male; D013177:Sports; D013997:Time Factors; D055815:Young Adult
chemical_list: D001786:Blood Glucose; D002241:Carbohydrates