Cardiac OutputExercise ToleranceExercise TestHemodynamicsExercisePhysical Conditioning, AnimalExercise TherapyMyocytes, CardiacPhysical ExertionHeartOxygen ConsumptionHeart RatePhysical EnduranceArrhythmias, CardiacMuscle, SkeletalCardiac Surgical ProceduresDeath, Sudden, CardiacTime FactorsRestBicyclingBlood PressureHeart FailureElectrocardiographyHeart DiseasesCardiac Pacing, ArtificialMyocardiumCardiomegalyCardiac CatheterizationMyocardial ContractionPhysical FitnessCardiac TamponadeHeart VentriclesRunningResistance TrainingPulmonary Gas ExchangeLactic AcidAnaerobic ThresholdStroke VolumeEchocardiographyMuscle Stretching ExercisesTreatment OutcomeHeart ArrestVentricular Function, LeftCardiac Output, LowCardiomyopathiesMyocardial InfarctionBreathing ExercisesMyoblasts, CardiacRegional Blood FlowHeart Function TestsCardiac MyosinsHeart TransplantationEnergy MetabolismCardiac Imaging TechniquesCardiac VolumeProspective StudiesVentricular RemodelingAnalysis of VarianceAdaptation, PhysiologicalPhysical Education and TrainingCardiac GlycosidesVentricular Dysfunction, LeftLegOxygenFollow-Up StudiesDogsCardiovascular Physiological PhenomenaGlycogenRespirationOut-of-Hospital Cardiac ArrestAsthma, Exercise-InducedRats, Sprague-DawleyHeart Defects, CongenitalTroponin IMuscle ProteinsExercise Movement TechniquesCoronary DiseaseMuscle StrengthMuscle ContractionWeight LiftingMuscle FatigueSportsCardiomyopathy, DilatedCardiotonic AgentsRisk FactorsVascular ResistanceBody WeightBlood GlucoseWalkingPredictive Value of TestsHeart Conduction SystemTroponin TDyspneaRats, WistarDisease Models, AnimalCardiac Resynchronization TherapyErgometryAdrenergic beta-AntagonistsModels, CardiovascularBiological Markers