Abstract
There is good evidence that mouth rinsing with carbohydrate (CHO) solutions can enhance endurance performance (≥30 min). The impact of a CHO mouth rinse on sprint performance has been less consistent, suggesting that CHO may confer benefits in conditions of ‘metabolic strain’. To test this hypothesis, the current study examined the impact of late-exercise mouth rinsing on sprint performance. Secondly, we investigated the effects of a protein mouth rinse (PRO) on performance. Eight trained male cyclists participated in three trials consisting of 120 min of constant-load cycling (55% Wmax) followed by a 30 km computer-simulated time trial, during which only water was provided. Following 15 min of muscle function assessment, 10 min of constant-load cycling (3 min at 35% Wmax, 7 min at 55% Wmax) was performed. This was immediately followed by a 2 km time trial. Subjects rinsed with 25 mL of CHO, PRO, or placebo (PLA) at min 5:00 and 14:30 of the 15 min muscle function phase, and min 8:00 of the 10-min constant-load cycling. Magnitude-based inferential statistics were used to analyze the effects of the mouth rinse on 2-km time trial performance and the following physiological parameters: Maximum Voluntary Contract (MVC), Rating of Perceived Exertion (RPE), Heart Rate (HR), and blood glucose levels. The primary finding was that CHO ‘likely’ enhanced performance vs. PLA (3.8%), whereas differences between PRO and PLA were unclear (0.4%). These data demonstrate that late-race performance is enhanced by a CHO rinse, but not PRO, under challenging metabolic conditions. More data should be acquired before this strategy is recommended for the later stages of cycling competition under more practical conditions, such as when carbohydrates are supplemented throughout the preceding minutes/hours of exercise.
Highlights
Carbohydrate (CHO) ingestion during exercise has been widely reported to enhance exercise performance, during prolonged exercise when endogenous carbohydrates are limited.A large share of the CHO-induced performance gains during prolonged exercise are thought to be due to elevated carbohydrate oxidation rates late in exercise [1,2,3,4] and/or muscle/liver glycogen sparing [3,5,6]
Mean Heart Rate (HR), Rating of Perceived Exertion (RPE), and blood glucose levels are displayed in. This project was primarily designed to examine the potential for a carbohydrate (CHO) mouth rinse to enhance high-intensity performance towards the end of prolonged exercise
We included a separate experimental trial to investigate the possible benefit of mouth rinsing with a protein solution (PRO)
Summary
Carbohydrate (CHO) ingestion during exercise has been widely reported to enhance exercise performance, during prolonged exercise when endogenous carbohydrates are limited. An explanation for how CHO supplementation can improve high-intensity performance was provided by Carter and colleagues whereby CHO mouth rinsing (MR) (without swallowing) enhanced a time trial performance lasting ~1 h [10]. Nothing is known about the potential for CHO MR to enhance short-duration trial performance at the end of prolonged exercise, analogous to a typical ‘final surge’ to the finish line late in the endurance competition. We designed this project to test the hypotheses that mouth rinsing with CHO can enhance 2 km time trial performance when preceded by ~3 h of cycling. It is conceivable that a protein mouth rinse can alter performance but this possibility has not yet been investigated
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
