Lower Body Negative PressureBlood PressureHypovolemiaForearmHead-Down TiltOrthostatic IntoleranceBed RestCentral Venous PressureVascular CapacitanceDizzinessHeart RatePressoreceptorsHypotension, OrthostaticBaroreflexVascular ResistanceSympathetic Nervous SystemCardiovascular DeconditioningPressureGravity SuitsSupine PositionWeightlessness SimulationRegional Blood FlowWeightlessness CountermeasuresSpace FlightHypertensionReflexSyncopeNegative-Pressure Wound TherapyPlethysmographyHemodynamicsVentilators, Negative-PressureVasoconstrictionArterial PressureTilt-Table TestNorepinephrineBlood VolumeBlood Pressure DeterminationCardiac OutputLegGravitationPostureWeightlessnessBlood Flow VelocityHypotensionComplianceVasomotor SystemStroke VolumeCold TemperatureBlood Pressure Monitoring, AmbulatoryAutonomic Nervous SystemVeinsSkin TemperatureCardiovascular Physiological PhenomenaExercisePulmonary Wedge PressureAntihypertensive AgentsPelvisHand StrengthRestTime FactorsBrachial ArteryMuscle, SkeletalReference ValuesCerebrovascular CirculationHydrostatic PressureRisk FactorsStress, PhysiologicalMiddle Cerebral ArteryAnalysis of VarianceAir PressureAgingEpinephrineOxygen ConsumptionPrevalenceElectrocardiographySystoleCross-Sectional StudiesHeartSkinMusclesTransducers, PressureRats, Inbred SHRBody Mass IndexBlood Pressure MonitorsSuctionProspective StudiesFollow-Up StudiesSkin CareTreatment OutcomeAbdominal Wound Closure TechniquesCardiovascular DiseasesReninBody WeightDepression