Autonomic Nervous SystemAutonomic Nervous System DiseasesHeart RateCentral Nervous SystemParasympathetic Nervous SystemSympathetic Nervous SystemNervous SystemGanglionic BlockersAutonomic DenervationVagus NerveAutonomic PathwaysAutonomic AgentsGalvanic Skin ResponseAutonomic Nerve BlockArrhythmia, SinusCardiovascular Physiological ProcessesBlood PressureElectrocardiographyElectrocardiography, AmbulatoryCentral Nervous System DiseasesEnteric Nervous SystemAtropineTrimethaphanPeripheral Nervous SystemDysautonomia, FamilialPropranololHeartCardiovascular SystemBaroreflexCardiovascular Physiological PhenomenaBrainHexamethoniumParasympatholyticsCircadian RhythmMuscarinic AntagonistsParasympathectomyValsalva ManeuverCentral Nervous System NeoplasmsGanglia, AutonomicNorepinephrineGlycopyrrolateCatecholaminesChlorisondamineMassageArrhythmias, CardiacNeuronsPancreatic PolypeptideHypoventilationAdrenergic AgentsPsychophysiologyOxymetazolineNervous System Physiological PhenomenaShy-Drager SyndromeBradycardiaCardiography, ImpedanceDogsSupine PositionRelaxationNeurosecretory SystemsAdrenergic beta-AntagonistsTime FactorsTilt-Table TestPeripheral NervesVagus Nerve StimulationStress, PsychologicalCentral Nervous System InfectionsRespirationAtrial FunctionSignal Processing, Computer-AssistedHemodynamicsNeuroimmunomodulationMagnetocardiographyTelemetryEpinephrineAdrenergic FibersHead-Down TiltPressoreceptorsSympathectomyArousalHeart Rate, FetalNervous System DiseasesNervous System NeoplasmsAnalysis of VarianceRespiratory RateAdrenergic NeuronsHeart Conduction SystemAdrenergic AgonistsHypotension, OrthostaticReflexAdrenergic AntagonistsGanglia, SympatheticHexamethonium CompoundsNerve Tissue ProteinsHypothalamusGanglionic StimulantsRats, WistarSympathetic Fibers, PostganglionicElectroacupunctureReflex, AbnormalSplanchnic Nerves