Combined Glucose Ingestion and Mouth Rinsing Improves Sprint Cycling Performance

Mar 27, 2014International journal of sport nutrition and exercise metabolism

Taking in and tasting sugar together improves sprint cycling performance

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Abstract

Peak power output during maximal sprint cycling was 1188 ± 166 W with a glucose solution, significantly higher than other solutions tested.

Glucose ingestion and mouth rinsing improved peak power output compared to water and other carbohydrate solutions.
Mean power output during sprints was higher with glucose than with maltodextrin, and tended to be higher than with water.
Blood glucose levels increased similarly with glucose and maltodextrin, indicating no significant difference in this response.
No significant differences in blood lactate or pH were observed among the different treatments.

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This study investigated whether combined ingestion and mouth rinsing with a carbohydrate solution could improve maximal sprint cycling performance. Twelve competitive male cyclists ingested 100 ml of one of the following solutions 20 min before exercise in a randomized double-blinded counterbalanced order (a) 10% glucose solution, (b) 0.05% aspartame solution, (c) 9.0% maltodextrin solution, or (d) water as a control. Fifteen min after ingestion, repeated mouth rinsing was carried out with 11 × 15 ml bolus doses of the same solution at 30-s intervals. Each participant then performed a 45-s maximal sprint effort on a cycle ergometer. Peak power output was significantly higher in response to the glucose trial (1188 ± 166 W) compared with the water (1036 ± 177 W), aspartame (1088 ± 128 W) and maltodextrin (1024 ± 202 W) trials by 14.7 ± 10.6, 9.2 ± 4.6 and 16.0 ± 6.0% respectively (p < .05). Mean power output during the sprint was significantly higher in the glucose trial compared with maltodextrin (p < .05) and also tended to be higher than the water trial (p = .075). Glucose and maltodextrin resulted in a similar increase in blood glucose, and the responses of blood lactate and pH to sprinting did not differ significantly between treatments (p > .05). These findings suggest that combining the ingestion of glucose with glucose mouth rinsing improves maximal sprint performance. This ergogenic effect is unlikely to be related to changes in blood glucose, sweetness, or energy sensing mechanisms in the gastrointestinal tract.

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Combined Glucose Ingestion and Mouth Rinsing Improves Sprint Cycling Performance

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