title: No Dose-Response Effect of Carbohydrate Mouth Rinse Concentration on 5-km Running Performance in Recreational Athletes.
abstract: Clarke, ND, Thomas, JR, Kagka, M, Ramsbottom, R, and Delextrat, A. No dose-response effect of carbohydrate mouth rinse concentration on 5-km running performance in recreational athletes. J Strength Cond Res 31(3): 715-720, 2017-Oral carbohydrate rinsing has been demonstrated to provide beneficial effects on exercise performance of durations of up to 1 hour, albeit predominately in a laboratory setting. The aim of the present study was to investigate the effects of different concentrations of carbohydrate solution mouth rinse on 5-km running performance. Fifteen healthy men (n = 9; mean ± SD age; 42 ± 10 years; height, 177.6 ± 6.1 cm; body mass, 73.9 ± 8.9 kg) and women (n = 6; mean ± SD age, 43 ± 9 years; height, 166.5 ± 4.1 cm; body mass, 65.7 ± 6.8 kg) performed a 5-km running time trial on a track on 4 separate occasions. Immediately before starting the time trial and then after each 1 km, subjects rinsed 25 ml of 0, 3, 6, or 12% maltodextrin for 10 seconds. Mouth rinsing with 0, 3, 6, or 12% maltodextrin did not have a significant effect on the time to complete the time trial (0%, 26:34 ± 4:07 minutes:seconds; 3%, 27:17 ± 4:33 minutes:seconds; 6%, 27:05 ± 3:52 minutes:seconds; 12%, 26:47 ± 4.31 minutes:seconds; p = 0.071; (Equation is included in full-text article.)= 0.15), heart rate (p = 0.095; (Equation is included in full-text article.)= 0.16), rating of perceived exertion (p = 0.195; (Equation is included in full-text article.)= 0.11), blood glucose (p = 0.920; (Equation is included in full-text article.)= 0.01), and blood lactate concentration (p = 0.831; (Equation is included in full-text article.)= 0.02), with only nonsignificant trivial to small differences between concentrations. Results of this study suggest that carbohydrate mouth rinsing provides no ergogenic advantage over an acaloric placebo (0%) and that there is no dose-response relationship between carbohydrate solution concentration and 5-km track running performance.
authors.affiliation: 1Department of Applied Sciences and Health, Faculty Health and Life Sciences, Coventry University, Coventry, United Kingdom; and 2Department of Sport and Health Sciences, Faculty of Health and Life Sciences, Oxford Brookes University, Oxford, United Kingdom.
authors.forename: Neil D
authors.initials: ND
authors.lastname: Clarke
authors.forename: James R
authors.initials: JR
authors.lastname: Thomas
authors.forename: Marion
authors.initials: M
authors.lastname: Kagka
authors.forename: Roger
authors.initials: R
authors.lastname: Ramsbottom
authors.forename: Anne
authors.initials: A
authors.lastname: Delextrat
mesh_terms: D000328:Adult; D054874:Athletic Performance / Q000502:physiology*; D001786:Blood Glucose / Q000187:drug effects; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D015444:Exercise / Q000502:physiology; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D008875:Middle Aged; D009067:Mouthwashes / Q000008:administration & dosage* / Q000737:chemistry; D005082:Physical Exertion / Q000502:physiology; D011134:Polysaccharides / Q000737:chemistry / Q000494:pharmacology*; D012420:Running / Q000502:physiology*; D016037:Single-Blind Method
chemical_list: D001786:Blood Glucose; D004040:Dietary Carbohydrates; D009067:Mouthwashes; D011134:Polysaccharides; D019344:Lactic Acid; C008315:maltodextrin