title: Caffeine enhances cognitive function and skill performance during simulated soccer activity.
abstract: There is little evidence regarding the benefits of caffeine ingestion on cognitive function and skillful actions during sporting performance, especially in sports that are multifaceted in their physiological, skill, and cognitive demands.
  
  
  OBJECTIVE
  To examine the influence of caffeine on performance during simulated soccer activity.
  
  
  METHODS
  Twelve male soccer players completed two 90-min soccer-specific intermittent running trials interspersed with tests of soccer skill (LSPT). The trials were separated by 7 days and adhered to a randomized crossover design. On each occasion participants ingested 6 mg/kg body mass (BM) of caffeine (CAF) or a placebo (PLA) in a double-blind fashion 60 min before exercise. Movement time, penalties accrued, and total time were recorded for the LSPT. Physiological and performance markers were measured throughout the protocol. Water (3 ml/kg BM) was ingested every 15 min.
  
  
  RESULTS
  Participants accrued significantly less penalty time in the CAF trial (9.7 +/- 6.6 s vs. PLA 11.6 +/- 7.4 s; p = .02), leading to a significantly lower total time in this trial (CAF 51.6 +/- 7.7 s vs. PLA 53.9 +/- 8.5 s; p = .02). This decrease in penalty time was probably attributable to an increased passing accuracy in the CAF trial (p = .06). Jump height was 2.7% (+/- 1.1%) higher in the CAF trial (57.1 +/- 5.1 cm vs. PLA 55.6 +/- 5.1 cm; p = .01).
  
  
  CONCLUSIONS
  Caffeine ingestion before simulated soccer activity improved players' passing accuracy and jump performance without any detrimental effects on other performance parameters.
authors.affiliation: Institute of Food, Nutrition and Human Health, Massey University, Auckland, New Zealand.
authors.forename: Andrew
authors.initials: A
authors.lastname: Foskett
authors.forename: Ajmol
authors.initials: A
authors.lastname: Ali
authors.forename: Nicholas
authors.initials: N
authors.lastname: Gant
mesh_terms: D054874:Athletic Performance / Q000502:physiology / Q000523:psychology; D002110:Caffeine / Q000494:pharmacology*; D000697:Central Nervous System Stimulants / Q000494:pharmacology*; D003071:Cognition / Q000187:drug effects* / Q000502:physiology; D018592:Cross-Over Studies; D004311:Double-Blind Method; D006801:Humans; D008297:Male; D012916:Soccer / Q000502:physiology*; D013647:Task Performance and Analysis; D055815:Young Adult
chemical_list: D000697:Central Nervous System Stimulants; D002110:Caffeine