Prevalence of caffeine use in elite athletes following its removal from the World Anti-Doping Agency list of banned substances.

@article{DelCoso2011PrevalenceOC,
  title={Prevalence of caffeine use in elite athletes following its removal from the World Anti-Doping Agency list of banned substances.},
  author={Juan Del Coso and Gloria Mu{\~n}oz and Jes{\'u}s Mu{\~n}oz-Guerra},
  journal={Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme},
  year={2011},
  volume={36 4},
  pages={
          555-61
        }
}
The aim of this investigation was to determine the use of caffeine by athletes after its removal from the World Anti-Doping Agency list. For this purpose, we measured the caffeine concentration in 20 686 urine samples obtained for doping control from 2004 to 2008. We utilized only urine samples obtained after official national and international competitions. Urine caffeine concentration was determined using alkaline extraction followed by gas chromatography-mass spectrometry. The limit of… 

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