Cardiac OutputPhysical Conditioning, AnimalHemodynamicsExercisePhysical ExertionExercise TestExercise TherapyPhysical EnduranceHydroa VacciniformeMuscle, SkeletalExercise ToleranceSwine, MiniatureTime FactorsAdaptation, PhysiologicalMotor ActivityOxygen ConsumptionMyocardiumMyocytes, CardiacAgingHeart RateRats, Sprague-DawleyHeartBicyclingRestPhysical FitnessResistance TrainingRunningAnaerobic ThresholdBlood PressureArrhythmias, CardiacPulmonary Gas ExchangeMuscle Stretching ExercisesLactic AcidDeath, Sudden, CardiacCardiac Surgical ProceduresElectrocardiographyHeart FailureBreathing ExercisesTreatment OutcomeStroke VolumePhysical Education and TrainingRegional Blood FlowHeart DiseasesLegEnergy MetabolismMyocardial ContractionAsthma, Exercise-InducedGlycogenCardiac Pacing, ArtificialCardiac CatheterizationHeart VentriclesExercise Movement TechniquesCardiomegalyEchocardiographyAnalysis of VarianceMuscle StrengthWeight LiftingVentricular Function, LeftMuscle FatigueOxygenRespirationCardiovascular Physiological PhenomenaMuscle ContractionSportsWalkingCardiac TamponadeCardiac Output, LowErgometryBlood GlucoseProspective StudiesHeart Function TestsDyspneaFollow-Up StudiesBody WeightQuadriceps MuscleCoronary DiseaseLactatesMyocardial InfarctionCarbon DioxideVentricular Dysfunction, LeftCross-Over StudiesHeart ArrestRespiratory Function TestsMuscle ProteinsSwimmingSingle-Blind MethodVascular ResistanceCardiomyopathiesHeart TransplantationDogsPhosphocreatineSweatingRespiratory MechanicsCardiac VolumeVentricular RemodelingRisk FactorsReference ValuesIsometric ContractionEpinephrineForearm