Caffeine supplementation does not affect match activities and fatigue resistance during match play in young football players |
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Authors: | Svein Arne Pettersen Peter Krustrup Mads Bendiksen Morten Bredsgaard Randers Joao Brito Jens Bangsbo |
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Affiliation: | 1. Faculty of Health Sciences, The Regional Centre for Sport, Exercise and Health–North, University of Tromsoe, Tromso, Norway;2. Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, Exeter, UK;3. Department of Nutrition, Exercise and Sports, Copenhagen Centre for Team Sport and Health, University of Copenhagen, Copenhagen, Denmark;4. Department of Nutrition, Exercise and Sports, Copenhagen Centre for Team Sport and Health, University of Copenhagen, Copenhagen, Denmark;5. National Sports Medicine Programme, Aspetar – Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar |
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Abstract: | AbstractThe study examined the effect of caffeine supplementation on match activities and development of fatigue during a football match. In a randomised, double-blind cross-over design, two experimental football games separated by 7 days were organised between the junior teams of two professional football clubs (17.6 ± 1.1 years (±s), 71.7 ± 6.9 kg, 13.9% ± 5.0% body fat). The players ingested either a capsule of 6 mg · kg?1 b.w. caffeine or placebo (dextrose) 65 min prior to the matches. Match activities were assessed using the ZXY match analysis system, and a Yo-Yo intermittent recovery test–level 2 (Yo-Yo IR2) was conducted immediately post-game. Heart rate was monitored throughout the game, and blood samples were obtained at baseline, half-time and after the game. There were no differences between caffeine and placebo regarding total distance covered (10,062 ± 916 vs 9854 ± 901 m), high-intensity running (557 ± 178 vs 642 ± 240 m), sprinting distance (109 ± 58 vs 112 ± 69 m) or acceleration counts (123 ± 31 vs 126 ± 24). In both trials, players displayed lower (P < 0.05) values in total distance and acceleration counts in the last 15 min compared to all other 15-min periods of the matches. Post-game Yo-Yo IR2 performance was not different between game trials (caffeine: 829 ± 322 m; placebo 819 ± 289 m). In conclusion, oral caffeine administration does not appear to have an ergogenic effect in young football players during match play. |
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Keywords: | intermittent exercise performance ergogenic effect Yo-Yo IR2 test blood lactate match analysis soccer |
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