Oxygen ConsumptionOxygenCoronary CirculationMyocardiumDogsHemodynamicsHeartEnergy MetabolismHeart RateMyocardial ContractionCardiac OutputBlood PressureDobutamineLactic AcidLactatesCoronary VesselsReactive Oxygen SpeciesPhysical ExertionVascular ResistanceRegional Blood FlowCardiotonic AgentsPrenylamineVentricular Function, LeftIsothiuroniumBlood Flow VelocityCarbon DioxideVentricular FunctionCarbon RadioisotopesAdenosinePerfusionTomography, Emission-ComputedMyocardial StunningCardiac Pacing, ArtificialPartial PressureAcetatesGlucoseNitric OxideMyocardial IschemiaExercise TestPropranololStroke VolumeTime FactorsExtracorporeal CirculationHeart VentriclesMitochondria, HeartPhosphocreatineVeratrineHeart Arrest, InducedAlcohol DrinkingHeart FailureAdenosine TriphosphateCalcium ChlorideNorepinephrineSwineCoronary DiseaseHalothaneAdrenergic beta-AntagonistsVasodilator AgentsVentricular PressureDose-Response Relationship, DrugAnesthesiaHyperemiaCardiomyopathy, DilatedOxidation-ReductionExerciseModels, CardiovascularPhysical Conditioning, AnimalMitochondriaVasodilationCitric Acid CycleOxygen Inhalation TherapyDepression, ChemicalPolarographyIsoproterenolAngina PectorisBody Temperature RegulationSinglet OxygenMyocardial ReperfusionFatty AcidsBlood Gas AnalysisCell RespirationNitroglycerinDietBradykininFatty Acids, NonesterifiedDiastoleTheophyllineRespirationEnzyme InhibitorsAdrenergic beta-AgonistsBlood VolumeAnoxiaNitric Oxide SynthaseExercise ToleranceIsofluraneBody TemperatureIon-Selective ElectrodesSystoleNitroarginineNG-Nitroarginine Methyl Ester