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Carbohydrate Mouth Rinse Improves 1.5 h Run Performance: Is There A Dose-Effect?
Benjamin F Wright1, Glen Davison2
1Department of Sport and Exercise Science, Aberystwyth University, Aberystwyth, Ceredigion, SY23 3FD, United Kingdom.
Carbohydrate-electrolyte (CHO-E) mouth rinsing significantly improves endurance running performance. However, a 6% concentration appears as effective as a 12% concentration, indicating no clear dose-response effect for this ergogenic aid.
Area of Science:
- Exercise Physiology
- Sports Nutrition
- Human Performance
Background:
- Emerging evidence supports carbohydrate (CHO) mouth rinsing as an ergogenic aid for endurance performance.
- Limited research exists on the dose-response relationship between CHO concentration and performance benefits.
- Understanding optimal CHO concentrations is crucial for practical application in sports.
Purpose of the Study:
- To investigate the dose-effect of two different carbohydrate-electrolyte (CHO-E) solution concentrations (6% and 12% w/v) on 90-minute treadmill running performance.
- To compare the ergogenic effects of 6% and 12% CHO-E mouth rinses against a placebo.
Main Methods:
- Seven active males completed one familiarization and three experimental trials.
- Participants performed 90-minute self-paced treadmill runs.
- Mouth rinses (placebo, 6% CHO-E, 12% CHO-E) were administered at 0, 15, 30, and 45 minutes.
Main Results:
- Total distance covered was significantly greater in both 6% (14.6 ± 1.7 km) and 12% (14.9 ± 1.6 km) CHO-E trials compared to placebo (13.9 ± 1.7 km).
- No significant difference in performance was observed between the 6% and 12% CHO-E concentrations.
- Subjective measures (RPE, arousal) did not differ between conditions, suggesting enhanced performance occurred at similar perceived effort levels.
Conclusions:
- Mouth rinsing with a carbohydrate-electrolyte solution effectively enhances endurance running performance.
- A 6% CHO-E solution provides similar performance benefits to a 12% solution, suggesting no significant dose-response effect within this range.
- The ergogenic effects of CHO-E mouth rinsing persist for at least 20-45 minutes post-rinsing.
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