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Hypotension, OrthostaticHeadacheHypotensionOrthostatic IntoleranceHeadache DisordersTension-Type HeadachePostural Orthostatic Tachycardia SyndromeHypotension, ControlledCluster HeadacheDizzinessTilt-Table TestIntracranial HypotensionPostureVascular HeadachesLower Body Negative PressureAutonomic Nervous System DiseasesMigraine DisordersSyncopeBlood PressureSupine PositionHeadache Disorders, SecondaryMidodrineHead-Down TiltShy-Drager SyndromeHeart RatePure Autonomic FailureSyncope, VasovagalBed RestValsalva ManeuverBaroreflexSpace FlightAutonomic Nervous SystemTachycardiaCardiovascular DeconditioningHemodynamicsWeightlessness SimulationFludrocortisoneHypovolemiaSympathetic Nervous SystemVascular ResistanceWeightlessness CountermeasuresBlood Patch, EpiduralPlasma VolumePrimary DysautonomiasCerebrovascular CirculationCardiac OutputBlood VolumeDysautonomia, FamilialBradycardiaGravity SuitsNorepinephrineAstronautsEphedrineMigraine without AuraCardiovascular SystemWeightlessnessPost-Exercise HypotensionBionicsMultiple System AtrophyDroxidopaRegional Blood FlowTrimethaphanPyridostigmine BromideHeat Stress DisordersPressoreceptorsSpinal PunctureBlood Flow VelocityAnesthesia, SpinalVascular CapacitanceTime FactorsGravity, AlteredTreatment OutcomeFluid ShiftsSyndromeHyperventilationJoggingLegHistory, Modern 1601-Early AmbulationSweatingAnesthesia, ObstetricalCardiovascular Physiological PhenomenaCentral Venous PressureMigraine with AuraTremorReflexPlethysmographyPhysical Conditioning, HumanDura MaterSpace Motion SicknessProspective StudiesVasoconstrictor AgentsVasoconstrictionHypertensionElectrocardiographyAnalgesicsNeurologyForearmEpinephrinePhenylephrine