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Nutrients 2018, 10(3), 342;

Carbohydrate Mouth Rinse Fails to Improve Four-Kilometer Cycling Time Trial Performance

Exercise Psychophysiology Research Group, School of Arts, Science and Humanities, University of São Paulo, São Paulo 03828-000, Brazil
Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos 11015-020, Brazil
School of Physical Education and Sport, University of São Paulo, São Paulo 05508-030, Brazil
Integrated Group of Biotechnology, Lab Adipose Tissue Biology, University of Mogi das Cruzes, São Paulo 05305-000, Brazil
Physical Education Department, Federal University of Paraná, Paraná 80060-000, Brazil
Author to whom correspondence should be addressed.
Received: 8 January 2018 / Revised: 12 February 2018 / Accepted: 27 February 2018 / Published: 12 March 2018
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We investigated if a carbohydrate (CHO) mouth rinse may attenuate global fatigue and improve 4-km cycling time trial (TT4km) performance. After a preliminary session, cyclists (n = 9) performed a TT4km after a CHO or placebo (PLA) mouth rinse. Mean power output, time, and ratings of perceived exertion (RPE) were recorded throughout the TT4km. Twitch interpolation responses (%VA; voluntary activation and ∆Tw; delta peak twitch torque) were compared pre and post TT4km with traditional statistics and effect size (ES) analysis. Time-to-complete the 4 km and mean power output were comparable between CHO (386.4 ± 28.0 s) and PLA (385.4 ± 22.4 s). A lower central (p = 0.054) and peripheral (p = 0.02) fatigue in CHO than in PLA were suggested by an extremely-large ES in %VA (manipulation main effect: p = 0.052, d = 1.18; manipulation-by-time interaction effect: p = 0.08, d = 1.00) and an extremely, very-large ES in ∆Tw (manipulation main effect: p = 0.07, d = 0.97; time-by-manipulation interaction effect: p = 0.09, d = 0.89). The RPE increased slower in CHO than in PLA (p = 0.051; d = 0.7). The apparent reduction in global fatigue (central and peripheral) and RPESLOPE with only one CHO mouth rinse were not translated into improved TT4km performance. Further tests may be required to verify if these likely differences in global fatigue might represent an edge in the short-lasting cycling time trial performance. View Full-Text
Keywords: central fatigue; peripheral fatigue; supplementation; twitch interpolation central fatigue; peripheral fatigue; supplementation; twitch interpolation

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Pires, F.O.; Brietzke, C.; Pinheiro, F.A.; Veras, K.; de Mattos, E.C.T.; Rodacki, A.L.F.; Ugrinowitsch, C. Carbohydrate Mouth Rinse Fails to Improve Four-Kilometer Cycling Time Trial Performance. Nutrients 2018, 10, 342.

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