CaffeinePsychomotor PerformanceReaction TimeAttentionMemoryAnimal FeedNeuropsychological TestsAnalysis of VariancePhotic StimulationBehavior, AnimalCentral Nervous System StimulantsTask Performance and AnalysisTheobromineCoffeeAthletic PerformanceReproducibility of ResultsRyanodineTime FactorsCognitionCalciumCytochrome P-450 CYP1A2Sensitivity and SpecificityAlgorithmsEmployee Performance AppraisalProcainePhosphodiesterase InhibitorsDose-Response Relationship, DrugChromatography, High Pressure LiquidCognition DisordersMuscle ContractionBeveragesSarcoplasmic ReticulumRyanodine Receptor Calcium Release ChannelReceptor, Adenosine A2ALearningRandom AllocationPhysical EnduranceSwineDouble-Blind MethodMotor SkillsWeight GainMuscle, SkeletalCross-Over StudiesMemory, Short-TermAdenosine A2 Receptor AntagonistsEducational MeasurementAnimal Nutritional Physiological PhenomenaEphedrineReceptor, Adenosine A1PaulliniaAgingMagnetic Resonance ImagingComputer SimulationPerformance-Enhancing SubstancesMotor ActivitySleep DeprivationEquipment DesignROC CurveWeaningDrinking BehaviorMalignant HyperthermiaAnimal HusbandryCattleDiscrimination (Psychology)Purinergic P1 Receptor AntagonistsClinical CompetenceBody WeightBrainDietDrug InteractionsPredictive Value of TestsProspective StudiesArousalPregnancyMemory DisordersDiscrimination LearningAdenosine A1 Receptor AntagonistsReceptors, Adenosine A2Models, StatisticalImage Processing, Computer-AssistedMyocardial ContractionQuality ControlTetracaineQuestionnairesQuality Indicators, Health CareMaze LearningReproductionEatingVisual PerceptionAchievementKarnofsky Performance StatusBiomechanical PhenomenaReagent Kits, DiagnosticCuesSoftwareElectroencephalography