Caffeine supplementation does not affect match activities and fatigue resistance during match play in young football players

• The 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 7days were organised between the junior teams of two professional football clubs (17.6 +/- 1.1years (+/- s), 71.7 +/- 6.9kg, 13.9%+/- 5.0% body fat). The players ingested either a capsule of 6mg center dot kg(-1)b.w. caffeine or placebo (dextrose) 65min 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 +/- 901m), high-intensity running (557 +/- 178 vs 642 +/- 240m), sprinting distance (109 +/- 58 vs 112 +/- 69m) 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 15min compared to all other 15-min periods of the matches. Post-game Yo-Yo IR2 performance was not different between game trials (caffeine: 829 +/- 322m; placebo 819 +/- 289m). In conclusion, oral caffeine administration does not appear to have an ergogenic effect in young football players during match play.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Medicinska och farmaceutiska grundvetenskaper -- Fysiologi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Basic Medicine -- Physiology (hsv//eng)

MEDICIN OCH HÄLSOVETENSKAP  -- Hälsovetenskap -- Idrottsvetenskap (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Health Sciences -- Sport and Fitness Sciences (hsv//eng)

Nyckelord

match analysis

Yo-Yo IR2 test

blood lactate

intermittent exercise performance

soccer

ergogenic

INTERMITTENT EXERCISE PERFORMANCE

PREMIER LEAGUE SOCCER

ELITE FEMALE

SOCCER

MUSCLE FATIGUE

PHYSIOLOGICAL-RESPONSE

SPRINT PERFORMANCE

SPORT

METABOLISM

PATTERNS

GAME

Sport Sciences

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