The aim of the present study was to investigate the influence of mouth rinsing carbohydrate at increasing concentrations on ~1 h cycle time trial performance. Eleven male cyclists completed three experimental trials, following an overnight fast. Cyclists performed a ~1 h time trial on a cycle ergometer, while rinsing their mouth for 5 s with either a 7% maltodextrin solution (CHO), 14% CHO or a taste-matched placebo (PLA) after every 12.5% of the set amount of work. Heart rate was recorded every 12.5% of the time trial, whilst RPE and GI comfort were determined every 25% of the time trial. The mouth rinse protocol influenced the time to complete the time trial (P<0.001), with cyclists completing the time trial faster during 7% CHO (57.3 ± 4.5 min; P=0.004) and 14% CHO (57.4 ± 4.1 min; P=0.007), compared to PLA (59.5 ± 4.9 min). There was no difference between the two carbohydrate trials (P=0.737). There was a main effect of time (P<0.001) for both heart rate and RPE, but no main effect of trial (P=0.107 and P=0.849, respectively). Scores for GI comfort ranged from 0-2 during trials, indicating very little GI discomfort during exercise. In conclusion, mouth rinsing and expectorating a 7% maltodextrin solution, for 5 s routinely during exercise was associated with improved cycle time trial performance approximately 1 h in duration. Increasing the carbohydrate concentration of the rinsed solution from 7% to 14% resulted in no further performance improvement
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