Abstract
IntroductionCarbohydrate (CHO) mouth rinsing can enhance sports performance through a central action mediated by receptors in the mouth. This study examined the effect of a CHO mouth rinse on salivary lysozyme concentrations, mood states and running performances.MethodsTen males recreational runners were randomised to three running trials with a 1 week recovery period between the trials. Each trial involved running at 75% maximum heart rate (HRmax) for 1 h, followed by a 15 min time trial. The participants used a CHO mouth rinse, placebo (PLA) solution or control (CON, no solution) every 15 min during the exercise. Heart rate (HR), rating of perceived exertion (RPE) and mood states were recorded pre-, during and post-exercise. Saliva samples were collected pre-, post- and 1 h post-exercise.ResultsThere was no significant interaction and time effect (P > 0.05) on the salivary lysozyme concentration and running performance, but it was significant (P < 0.05) for HR and RPE (increase in all trials). However, there was no significant difference (P > 0.05) in salivary lysozyme concentrations, running performances, HR values or RPE between the trials. Mood states were not significantly different (P > 0.05) between the trials, but one of the mood sub-scales showed a significant (P < 0.001) time effect (increase fatigue in all trials).ConclusionCHO mouth rinsing did not affect physiological parameters, salivary lysozyme concentrations, mood states or running performance among recreational runners.
Highlights
Carbohydrate (CHO) mouth rinsing can enhance sports performance through a central action mediated by receptors in the mouth
Heart rate (HR) values were unaffected by mouth rinsing or the type of mouth rinsing solution used during prolonged exercise
The results suggest that a CHO mouth rinse during exercise does not affect HR and that the effect depends on the type, intensity and volume of the exercise [20]
Summary
Carbohydrate (CHO) mouth rinsing can enhance sports performance through a central action mediated by receptors in the mouth. This study examined the effect of a CHO mouth rinse on salivary lysozyme concentrations, mood states and running performances. Highly concentrated CHO solutions and drinks with high osmolality have been linked to the development of gastrointestinal discomfort [2]. As CHO is not swallowed during mouth rinsing, this might be a good strategy to improve sports performance without inducing gastrointestinal discomfort during exercise. The first study in this area by Carter et al [3] reported that rinsing with a CHO mouthwash may have beneficial effects during high-intensity exercise. Several later studies reported that CHO mouth rinsing improved both cycling [4] and running [5] performances. CHO mouth rinsing increased the total distance covered during a selfselected 30 min run [6] and a 60 min self-paced run [7] in comparison to a placebo (PLA) mouth rinse
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