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

Autor: Pires FO; Exercise Psychophysiology Research Group, School of Arts, Science and Humanities, University of São Paulo, São Paulo 03828-000, Brazil. piresfo@usp.br.; Human Movement Science and Rehabilitation Program, Federal University of São Paulo, Santos 11015-020, Brazil. piresfo@usp.br., Brietzke C; Exercise Psychophysiology Research Group, School of Arts, Science and Humanities, University of São Paulo, São Paulo 03828-000, Brazil. cayquebbarreto@usp.br., Pinheiro FA; Exercise Psychophysiology Research Group, School of Arts, Science and Humanities, University of São Paulo, São Paulo 03828-000, Brazil. fapcor@hotmail.com.; School of Physical Education and Sport, University of São Paulo, São Paulo 05508-030, Brazil. fapcor@hotmail.com., Veras K; Integrated Group of Biotechnology, Lab Adipose Tissue Biology, University of Mogi das Cruzes, São Paulo 05305-000, Brazil. katherine.veras@gmail.com., de Mattos ECT; Physical Education Department, Federal University of Paraná, Paraná 80060-000, Brazil. eugeniamattos@hotmail.com., Rodacki ALF; Physical Education Department, Federal University of Paraná, Paraná 80060-000, Brazil. rodacki@ufpr.br., Ugrinowitsch C; School of Physical Education and Sport, University of São Paulo, São Paulo 05508-030, Brazil. ugrinowitsch@gmail.com.
Jazyk: angličtina
Zdroj: Nutrients [Nutrients] 2018 Mar 12; Vol. 10 (3). Date of Electronic Publication: 2018 Mar 12.
DOI: 10.3390/nu10030342
Abstrakt: We investigated if a carbohydrate (CHO) mouth rinse may attenuate global fatigue and improve 4-km cycling time trial (TT 4km ) performance. After a preliminary session, cyclists ( n = 9) performed a TT 4km after a CHO or placebo (PLA) mouth rinse. Mean power output, time, and ratings of perceived exertion (RPE) were recorded throughout the TT 4km . Twitch interpolation responses (%VA; voluntary activation and ∆Tw; delta peak twitch torque) were compared pre and post TT 4km 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 RPE SLOPE with only one CHO mouth rinse were not translated into improved TT 4km 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.
Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Databáze: MEDLINE
Externí odkaz: