title: Carbohydrate Mouth Rinse Improves 1.5 h Run Performance: Is There A Dose-Effect?
abstract: There is a substantial body of recent evidence showing ergogenic effects of carbohydrate (CHO) mouth rinsing on endurance performance. However, there is a lack of research on the dose-effect and the aim of this study was to investigate the effect of two different concentrations (6% and 12% weight/volume, w/v) on 90 minute treadmill running performance. Seven active males took part in one familiarization trial and three experimental trials (90-minute self-paced performance trials). Solutions (placebo, 6% or 12% CHO-electrolyte solution, CHO-E) were rinsed in the mouth at the beginning, and at 15, 30 and 45 minutes during the run. The total distance covered was greater during the CHO-E trials (6%, 14.6 ± 1.7 km; 12%, 14.9 ± 1.6 km) compared to the placebo trial (13.9 ± 1.7 km, P < 0.05). There was no significant difference between the 6% and 12% trials (P > 0.05). There were no between trial differences (P > 0.05) in ratings of perceived exertion (RPE) and feeling or arousal ratings suggesting that the same subjective ratings were associated with higher speeds in the CHO-E trials. Enhanced performance in the CHO-E trials was due to higher speeds in the last 30 minutes even though rinses were not provided during the final 45 minutes, suggesting the effects persist for at least 20-45 minutes after rinsing. In conclusion, mouth rinsing with a CHO-E solution enhanced endurance running performance but there does not appear to be a dose-response effect with the higher concentration (12%) compared to a standard 6% solution.
authors.affiliation: Department of Sport and Exercise Science, Aberystwyth University, Aberystwyth, Ceredigion, SY23 3FD, United Kingdom.
authors.forename: Benjamin F
authors.initials: BF
authors.lastname: Wright
authors.affiliation: Endurance Research Group, School of Sport and Exercise Sciences, University of Kent, The Medway Building, Chatham Maritime, Kent, ME4 4AG, United Kingdom.
authors.forename: Glen
authors.initials: G
authors.lastname: Davison
keywords: Mouth wash; endurance; nutrition; treadmill running