It is known that the reduction of muscle glycogen is not a limiting factor for performance in exercises lasting <1 hour.1 However, some studies have shown a beneficial effect on performance after carbohydrate (CHO) intake in these types of exercise,1-3 suggesting that the improvement in performance may be caused due to a CHO-induced central effect.4 It is proposed that taste cells receptors localized on buccal mucosa are activated specifically by CHO, independently of taste,5-7 and consequently, stimulate specific brain regions, such as ventral striatum, dorsolateral prefrontal cortex, and anterior cingulate cortex, which are supposedly related to form a connection between gustatory pathways and cognitive, behavioral, and emotional responses.8 The effects of CHO mouth rinse on performance seem to be related to exercise duration, but this is not fully elucidated. For example, the majority of studies have shown increase in performance after CHO mouth rinse in exercises lasting 30 to 60 minutes,4,9-11 in which time-trial protocols were used.4,10-12 However, only few studies have tested the effect of CHO mouth rinse in short-duration (lasting <5 min) and high-intensity exercises,11,13-17 and the results are contradictory, whereas one study showed positive result,17 but others do not.13-16 However, as these studies have used different exercise intensities, the concentration and type of CHO used were also varied; the effects of CHO mouth rinse are still unclear during high-intensity exercises, and further studies are necessary. Thus, the aim of our study was to investigate the effect of CHO mouth rinse on time to exhaustion in a short duration and high-intensity exercise protocol performed on a treadmill.
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