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

Autor(es)

Pires, Flavio O. ^{[1, 2]} ; Brietzke, Cayque ^[1] ; Pinheiro, Fabiano A. ^{[3, 1]} ; Veras, Katherine ^[4] ; de Mattos, Eugenia C. T. ^[5] ; Rodacki, Andre L. F. ^[5] ; Ugrinowitsch, Carlos ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Arts Sci & Humanities, Exercise Psychophysiol Res Grp, BR-03828000 Sao Paulo - Brazil

^[2] Univ Fed Sao Paulo, Human Movement Sci & Rehabil Program, BR-11015020 Santos - Brazil

^[3] Univ Sao Paulo, Sch Phys Educ & Sport, BR-05508030 Sao Paulo - Brazil

^[4] Univ Mogi das Cruzes, Lab Adipose Tissue Biol, Integrated Grp Biotechnol, BR-05305000 Sao Paulo - Brazil

^[5] Univ Fed Parana, Dept Phys Educ, BR-80060000 Curitiba, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NUTRIENTS; v. 10, n. 3 MAR 2018.
• Citações Web of Science: 7

Resumo

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 Delta 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 Delta 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. (AU)

• Processo FAPESP: 10/01317-0 - Reserva neurofisiológica: efeitos centrais e periféricos da suplementação de cafeína
• Beneficiário: Flávio de Oliveira Pires
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado