Lower Body Negative PressureHypovolemiaForearmHead-Down TiltBed RestOrthostatic IntoleranceVascular CapacitanceCentral Venous PressureDizzinessBlood PressurePressoreceptorsHypotension, OrthostaticCardiovascular DeconditioningHeart RateBaroreflexGravity SuitsSympathetic Nervous SystemSupine PositionVascular ResistanceWeightlessness SimulationWeightlessness CountermeasuresSpace FlightRegional Blood FlowReflexSyncopeNegative-Pressure Wound TherapyPlethysmographyVentilators, Negative-PressureVasoconstrictionTilt-Table TestPressureHemodynamicsArterial PressureBlood VolumeNorepinephrineGravitationLegCardiac OutputPostureWeightlessnessBlood Flow VelocityStroke VolumeVasomotor SystemComplianceCold TemperatureVeinsSkin TemperatureHypotensionPelvisAutonomic Nervous SystemHand StrengthCardiovascular Physiological PhenomenaRestPulmonary Wedge PressureExerciseBrachial ArteryMuscle, SkeletalTime FactorsStress, PhysiologicalMiddle Cerebral ArteryCerebrovascular CirculationOxygen ConsumptionReference ValuesSkinEpinephrineMusclesAnalysis of VarianceElectrocardiographyAir PressureHeartSuctionAbdominal Wound Closure TechniquesAgingSkin Care