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

Author:
Pires, Flávio O., Brietzke, Cayque, Pinheiro, Fabiano A., Veras, Katherine, de Mattos, Eugênia C. T., Rodacki, André L. F., Ugrinowitsch, Carlos
Source:
Nutrients 2018 v.10 no.3
ISSN:
2072-6643
Subject:
bicycling, carbohydrates, mouth, placebos, statistics, torque
Abstract:
We investigated if a carbohydrate (CHO) mouth rinse may attenuate global fatigue and improve 4-km cycling time trial (TT<inf>4km</inf>) performance. After a preliminary session, cyclists (n = 9) performed a TT<inf>4km</inf> after a CHO or placebo (PLA) mouth rinse. Mean power output, time, and ratings of perceived exertion (RPE) were recorded throughout the TT<inf>4km</inf>. Twitch interpolation responses (%VA; voluntary activation and ∆Tw; delta peak twitch torque) were compared pre and post TT<inf>4km</inf> 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<inf>SLOPE</inf> with only one CHO mouth rinse were not translated into improved TT<inf>4km</inf> 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.
Agid:
6502661