Abstract
1,2 Abstract - The objective of this study was to evaluate the effect of a carbohydrate mouth rinse on the repeated sprint ability (RSA) of young soccer players. Nine youth soccer players (15.0 ± 1.5 years; 60.7 ± 4.84 kg; 1.72 ± 0.05 m; 20.5 ± 1.25 kg/m 2 ) were selected. The athletes were submitted to an RSA test consisting of six sprints of 40 m (going/ return = 20 m + 20 m), separated by 20 s of passive recovery, under three experimental conditions: carbohydrate mouth rinse (CHO) or placebo (PLA) and control (CON). The mouth rinses containing CHO or PLA were administered 5 min and immediately before the beginning of the test in doses of 100 mL. The best sprint time (RSAbest), mean sprint time (RSAmean), and drop-off in sprint performance (fatigue index) were determined for the different treatments. One-way ANOVA for repeated measures did not identify significant differences (P > 0.05) in RSAbest (CHO = 7.30 ± 0.31 s; PLA = 7.30 ± 0.30 s; CON = 7.26 ± 0.16 s), RSAmean (CHO = 7.71 ± 0.30 s; PLA = 7.71 ± 0.25 s; CON = 7.66 ± 0.24 s), or fatigue index (CHO = 5.58 ± 2.16%; PLA = 5.77 ± 3.04%; CON = 5.55 ± 3.72%). The results suggest that a carbohydrate mouth rinse does not improve the repeated sprint performance of young soccer players.
Highlights
Rinsing the mouth with a carbohydrate (CHO) solution has recently been proposed as a strategy that apparently shows beneficial effects on high-intensity exercise performance (>75% VO2max)[1,2]
The results suggest that a carbohydrate mouth rinse does not improve the repeated sprint performance of young soccer players
In view of the above considerations, we believe that carbohydrate mouth rinse (CHO) mouth rinse can improve performance in a specific soccer test through the activation of brain regions related to motivation and reward and may be of fundamental importance under conditions of training and during competitions
Summary
Rinsing the mouth with a carbohydrate (CHO) solution has recently been proposed as a strategy that apparently shows beneficial effects on high-intensity exercise performance (>75% VO2max)[1,2]. Low-intensity exercises predominate in this sport, a greater efficiency of anaerobic metabolism would contribute decisively to athletic performance[5] Within this context, repeated sprint ability (RSA), defined as the ability to perform short-duration sprints[6,7], shows a close relationship with the distances run at high-intensity (>19.8 km.h-1) during matches[8]. This variable is able to discriminate between different competitive levels and different tactical positions, in soccer[9]. Some tests have been proposed for the evaluation of RSA10 and specific sprint trainings have been recommended to improve RSA by increasing the systemic physiological load[11,12]
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