title: Effects of isolated or combined carbohydrate and caffeine supplementation between 2 daily training sessions on soccer performance.
abstract: This study aimed to investigate whether isolated or combined carbohydrate (CHO) and caffeine (CAF) supplementation have beneficial effects on performance during soccer-related tests performed after a previous training session. Eleven male, amateur soccer players completed 4 trials in a randomized, double-blind, and crossover design. In the morning, participants performed the Loughborough Intermittent Shuttle Test (LIST). Then, participants ingested (i) 1.2 g·kg(-1) body mass·h(-1) CHO in a 20% CHO solution immediately after and 1, 2, and 3 h after the LIST; (ii) CAF (6 mg·kg(-1) body mass) 3 h after the LIST; (iii) CHO combined with CAF (CHO+CAF); and (iv) placebo. All drinks were taste-matched and flavourless. After this 4-h recovery, participants performed a countermovement jump (CMJ) test, a Loughborough Soccer Passing Test (LSPT), and a repeated-sprint test. There were no main effects of supplementation for CMJ, LSPT total time, or best sprint and total sprint time from the repeated-sprint test (p>0.05). There were also no main effects of supplementation for heart rate, plasma lactate concentration, rating of perceived exertion (RPE), pleasure-displeasure, and perceived activation (p>0.05). However, there were significant time effects (p<0.05), with heart rate, plasma lactate concentration, RPE, and perceived activation increasing with time, and pleasure-displeasure decreasing with time. In conclusion, isolated and/or combined CHO and CAF supplementation is not able to improve soccer-related performance tests when performed after a previous training session.
authors.affiliation: Department of Physical Education and Sports Science (CAV), Federal University of Pernambuco, Alto do Reservatório Street, Bela Vista, Vitória de Santo Antão, Pernambuco, 55608680 Brazil.
authors.forename: Victor Amorim
authors.initials: VA
authors.lastname: Andrade-Souza
authors.forename: Romulo
authors.initials: R
authors.lastname: Bertuzzi
authors.forename: Gustavo Gomes
authors.initials: GG
authors.lastname: de Araujo
authors.forename: David
authors.initials: D
authors.lastname: Bishop
authors.forename: Adriano Eduardo
authors.initials: AE
authors.lastname: Lima-Silva
mesh_terms: D000328:Adult; D054874:Athletic Performance / Q000706:statistics & numerical data*; D002110:Caffeine / Q000494:pharmacology*; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000494:pharmacology*; D019587:Dietary Supplements; D004311:Double-Blind Method; D005080:Exercise Test / Q000706:statistics & numerical data*; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D012916:Soccer; D013997:Time Factors
chemical_list: D004040:Dietary Carbohydrates; D019344:Lactic Acid; D002110:Caffeine
keywords: athletic performance; fatigue; nutrition; performance sportive; recovery; récupération