Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
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ISSN: 1303 - 2968   
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©Journal of Sports Science and Medicine (2018) 17, 181 - 187

Research article
Carbohydrate Mouth Rinse and Hydration Strategies on Cycling Performance in 30 Km Time Trial: A Randomized, Crossover, Controlled Trial
Amanda M.J. Ferreira1, Luiz F. Farias-Junior1, Thaynan A. A. Mota1, Hassan M. Elsangedy1, Aline Marcadenti2,3,4, Telma M.A.M. Lemos1, Alexandre H. Okano1, Ana P.T. Fayh1, 
Author Information
1 UFRN, Federal University of Rio Grande do Norte, Natal/RN, Brazil
2 HCor, Institute of Research, Coracao Hospital, São Paulo/SP, Brazil
3 IC/FUC, Graduate Program in Health Sciences: Cardiology, Institute of Cardiology/University Foundation of Cardiology of Rio Grande do Sul, Porto Alegre/RS, Brazil
4 UFCSPA, Graduate Program in Nutrition Sciences, Federal University of Health Sciences of Porto Alegre, Porto Alegre/RS, Brazil

Ana P.T. Fayh
✉ Department of Nutrition, Federal University of Rio Grande do Norte, Avenida Senador Salgado Filho, 3000, Campus Universitário - Lagoa Nova – Natal/RN- Brazil
Email: apfayh@yahoo.com.br
Publish Date
Received: 16-11-2017
Accepted: 08-02-2018
Published (online): 14-05-2018
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ABSTRACT

The aim of this study was to investigate whether carbohydrate mouth rinse (CMR) improves physical performance of cyclists during a 30-km time trial test and its influence on water balance compared to other strategies of fluid intake. Eleven recreationally trained male cyclists completed a 30 km time trial cycle ergometer under three experimental interventions: (a) CMR, (b) drinking to replace all weight loss (DWL), and (c) drinking “ad libitum” (DAL). Time to complete the 30 km time trial, heart rate, average power, velocity, weight loss, urine color, urine density and pH were evaluated. Statistical analysis was performed using repeated measures analysis of variance (RM-ANOVA) and generalized estimating equations (GEE) with Bonferroni adjustment (p < 0.05). Time to complete the 30 km time trial was similar among CMR 54.5 ± 2.9 min, DWL 53.6 ± 3.9 min and DAL 54.5 ± 2.5 min (p = 0.13). CMR (1.7 ± 0.4%) elicited similar water loss compared to the DAL (1.4 ± 0.6%) intervention, but it was higher than the DWL intervention (0.6 ± 0.6%) (p < 0.01). CMR did not improve the performance of recreationally trained cyclists in a 30 km time trial test compared to other fluid intake strategies. Furthermore, CMR causes higher water loss compared to DWL intervention.
Key words: Mouth rinsing, endurance performance, exercise, metabolism, nutrition


           Key Points
  • Carbohydrate mouth rinse is not a better performance improvement technique in compared to other hydration strategies in cyclists.
  • Drinking water ad libitum is an efficient strategy to hydrate, and does not harm sports performance compared to the water recommendations of the American College of Sports Medicine.
  • The water loss in carbohydrate mouth rinse is similar to strategy ad libitum.
  • Heart rate did not change throughout 30 km time trial in drinking water ad libitum intervention.
  • All interventions elicited weight loss after completion of the 30 km time trial.
 
 
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