Athletic PerformanceExercise ToleranceExercise TestSportsPerformance-Enhancing SubstancesDoping in SportsAthletesPhysical EnduranceSports MedicineExerciseFlatfootRunningAnabolic AgentsExercise TherapyOxygen ConsumptionFootballMuscle, SkeletalPhysical ExertionDietary SupplementsBicyclingAnaerobic ThresholdTask Performance and AnalysisMuscle FatigueLactic AcidPsychomotor PerformancePhysical Conditioning, AnimalHeart RateDyspneaPulmonary Gas ExchangeLung Diseases, ObstructiveTime FactorsBreathing ExercisesPhysical FitnessCarnosinePhysical Education and TrainingRespiratory Function TestsAltitudeDouble-Blind MethodWalkingMuscle StrengthEnergy MetabolismRespiratory MusclesPulmonary VentilationAnalysis of VarianceRestIntermittent ClaudicationCross-Over StudiesOxygenInspiratory CapacityFatigueAdaptation, PhysiologicalReproducibility of ResultsFontan ProcedureCardiovascular Physiological PhenomenaPulmonary Disease, Chronic ObstructiveGlycogenHemodynamicsMuscle ContractionDietary CarbohydratesSwimmingRespirationHeart FailureLactatesForced Expiratory VolumeQuadriceps MuscleBody WeightPlasma VolumeCardiac OutputSingle-Blind MethodDehydrationLegCitrate (si)-SynthaseBody Temperature RegulationCarbon DioxideTreatment OutcomeSensitivity and SpecificityNeuropsychological TestsCognitionStroke VolumeVital Capacity