Lower Body Negative PressureHypovolemiaForearmHead-Down TiltBed RestOrthostatic IntoleranceVascular CapacitanceCentral Venous PressureDizzinessBlood PressurePressoreceptorsHypotension, OrthostaticCardiovascular DeconditioningBaroreflexHeart RateGravity SuitsSympathetic Nervous SystemSupine PositionVascular ResistanceWeightlessness SimulationWeightlessness CountermeasuresSpace FlightRegional Blood FlowReflexSyncopeNegative-Pressure Wound TherapyPlethysmographyVentilators, Negative-PressureVasoconstrictionTilt-Table TestPressureHemodynamicsArterial PressureBlood VolumePostureNorepinephrineGravitationLegCardiac OutputWeightlessnessLow Back PainBlood Flow VelocityStroke VolumeVasomotor SystemComplianceCold TemperatureVeinsSkin TemperaturePelvisHypotensionAutonomic Nervous SystemHand StrengthCardiovascular Physiological PhenomenaPulmonary Wedge PressureRestBack PainExerciseBrachial ArteryMuscle, SkeletalStress, PhysiologicalMiddle Cerebral ArteryCerebrovascular CirculationTime FactorsBack InjuriesOxygen ConsumptionReference ValuesEpinephrineSkinMusclesAir PressureElectrocardiographyAnalysis of VarianceHeartSuctionAbdominal Wound Closure TechniquesSkin CareMusculoskeletal DiseasesAging