Heart RateHeartCaloric RestrictionHeart Rate, FetalHeart FailureEnergy IntakeAutonomic Nervous SystemBlood PressureHeart DiseasesHeart TransplantationHeart Defects, CongenitalHemodynamicsFetal HeartFood LabelingSympathetic Nervous SystemElectrocardiography, AmbulatoryTime FactorsBaroreflexHeart AtriaBody WeightElectrocardiographyAdrenergic beta-AntagonistsEnergy MetabolismHeart ValvesMyocardiumOxygen ConsumptionExercise TestMyocardial ContractionHeart BlockDiet, ReducingDietary FatsFast FoodsExerciseMenu PlanningHeart Function TestsParasympathetic Nervous SystemTelemetryDogsRestaurantsBradycardiaDietLongevityPropranololPhysical ExertionStroke VolumeRespirationDietary CarbohydratesObesityMyocardial IschemiaVentricular Function, LeftCardiovascular Physiological PhenomenaCoronary DiseaseRestAgingTachycardiaCardiovascular SystemAtropinePressoreceptorsPropanolaminesCardiac OutputCardiotonic AgentsHeart Arrest, InducedSirtuinsRisk FactorsNorepinephrineSinoatrial NodeProspective StudiesRats, Sprague-DawleyDouble-Blind MethodEchocardiographyReflexAutonomic Nervous System DiseasesBody TemperatureMyocardial InfarctionMyocytes, CardiacArrhythmia, SinusCardiac Output, LowEatingRats, WistarDose-Response Relationship, DrugReference ValuesCardiac Pacing, ArtificialFood PreferencesPostureMetoprololCircadian RhythmIsoproterenolCross-Over StudiesSupine PositionProtein-Energy MalnutritionModels, CardiovascularSirtuin 1Follow-Up StudiesDisease Models, AnimalSystoleSignal Processing, Computer-AssistedAnalysis of VarianceEpinephrineCardiomyopathy, DilatedWeight Loss