Athletic PerformanceExercise ToleranceExercise TestSportsPerformance-Enhancing SubstancesDoping in SportsAthletesPhysical EnduranceSports MedicineExerciseFlatfootRunningAnabolic AgentsExercise TherapyOxygen ConsumptionFootballMuscle, SkeletalPhysical ExertionDietary SupplementsBicyclingDNA DamageAnaerobic ThresholdTask Performance and AnalysisMuscle FatigueLactic AcidPsychomotor PerformancePhysical Conditioning, AnimalHeart RateDyspneaPulmonary Gas ExchangeLung Diseases, ObstructiveTime FactorsBreathing ExercisesCarnosinePhysical FitnessPhysical Education and TrainingRespiratory Function TestsAltitudeDouble-Blind MethodEnergy MetabolismWalkingAnalysis of VarianceMuscle StrengthRespiratory MusclesPulmonary VentilationOxygenRestIntermittent ClaudicationCross-Over StudiesInspiratory CapacityFatigueAdaptation, PhysiologicalReproducibility of ResultsFontan ProcedureCardiovascular Physiological PhenomenaHemodynamicsPulmonary Disease, Chronic ObstructiveGlycogenMuscle ContractionSwimmingDietary CarbohydratesRespirationHeart FailureBody WeightLactatesQuadriceps MuscleForced Expiratory VolumePlasma VolumeCardiac OutputSingle-Blind MethodDehydrationLegCitrate (si)-SynthaseTreatment OutcomeCarbon DioxideNeuropsychological TestsBody Temperature RegulationSensitivity and SpecificityCognitionStroke VolumeVital CapacityBlood PressureAnoxia