Blood PressureRegional Blood FlowBlood Flow VelocityPressureBlood Pressure DeterminationHypertensionBlood Pressure Monitoring, AmbulatoryHeart RateCerebrovascular CirculationAntihypertensive AgentsHemodynamicsVascular ResistanceHydrostatic PressureLaser-Doppler FlowmetrySystoleBlood Pressure MonitorsTime FactorsIntracranial PressurePulsatile FlowHypotensionDogsDiastoleIntraocular PressureArterial PressureReninPulseRenal CirculationFlow CytometrySympathetic Nervous SystemRats, Inbred SHRKidneyVasodilationVenous PressureArteriesTransducers, PressureOxygenVasodilator AgentsReference ValuesMicrocirculationOxygen ConsumptionVasoconstrictionProspective StudiesRats, Sprague-DawleyCarbon DioxideCardiovascular SystemXenon RadioisotopesBlood VolumeMicrospheresNorepinephrineCircadian RhythmAnalysis of VarianceAngiotensin IIAir PressureAtmospheric PressureHypertension, RenalBaroreflexNitric OxideCardiovascular DiseasesSphygmomanometersSplanchnic CirculationBrainRats, Inbred WKYDose-Response Relationship, DrugRisk FactorsSodium Chloride, DietaryPlethysmographyModels, CardiovascularCardiac OutputAngiotensin-Converting Enzyme InhibitorsDouble-Blind MethodCentral Venous PressureHeartBody WeightHyperemiaDiet, Sodium-RestrictedVasoconstrictor AgentsSodium, DietaryVentricular PressureFollow-Up StudiesPosturePressoreceptorsAnesthesiaCarotid ArteriesDisease Models, AnimalRenin-Angiotensin SystemBody Mass IndexLiver CirculationBlood Gas AnalysisExerciseRegression AnalysisRheologyAortaRats, WistarUltrasonography, DopplerCardiovascular Physiological PhenomenaRespirationNitroprussideTreatment OutcomePulmonary CirculationCross-Over Studies