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Athletic PerformanceExercise ToleranceExercise TestMuscle, SkeletalSportsPerformance-Enhancing SubstancesDoping in SportsAthletesPhysical EnduranceSports MedicineExerciseRunningFlatfootAnabolic AgentsMusclesMuscle Fibers, SkeletalOxygen ConsumptionExercise TherapyPhysical ExertionFootballMuscle ProteinsMuscle FatigueMuscle ContractionDietary SupplementsBicyclingAnaerobic ThresholdMuscle DevelopmentPhysical Conditioning, AnimalLactic AcidMitochondria, MuscleTask Performance and AnalysisMuscle, SmoothTime FactorsMuscle Fibers, Fast-TwitchPsychomotor PerformanceHeart RateRespiratory MusclesGlycogenMuscle Fibers, Slow-TwitchQuadriceps MuscleMuscle, Smooth, VascularPulmonary Gas ExchangeDyspneaEnergy MetabolismLung Diseases, ObstructiveSatellite Cells, Skeletal MuscleMuscle DenervationPhysical FitnessCarnosineBreathing ExercisesPhysical Education and TrainingMuscle StrengthMuscular AtrophyAdaptation, PhysiologicalCitrate (si)-SynthaseRestAnalysis of VarianceOxygenRespiratory Function TestsAltitudeDouble-Blind MethodBody WeightWalkingLegMuscular DiseasesPulmonary VentilationCross-Over StudiesIsometric ContractionIntermittent ClaudicationFatigueReproducibility of ResultsSwimmingInspiratory CapacityRegional Blood FlowHemodynamicsRabbitsAgingMuscle WeaknessCardiovascular Physiological PhenomenaLactatesHeartHeart FailureDietary CarbohydratesRespirationPulmonary Disease, Chronic ObstructiveInsulinMyofibrilsHindlimbMuscle CellsFontan ProcedureBlood GlucoseBody CompositionMyoblastsCardiac OutputBody Temperature RegulationAnoxiaBlood PressureForced Expiratory VolumeOrgan SizeMyosin Heavy Chains