Lower Body Negative PressureHypovolemiaForearmHead-Down TiltBed RestOrthostatic IntoleranceVascular CapacitanceCentral Venous PressureDizzinessBlood PressurePressoreceptorsHypotension, OrthostaticCardiovascular DeconditioningHeart RateBaroreflexBlood Pressure MonitorsGravity SuitsSympathetic Nervous SystemSupine PositionVascular ResistanceWeightlessness SimulationWeightlessness CountermeasuresSpace FlightRegional Blood FlowSphygmomanometersReflexSyncopeNegative-Pressure Wound TherapyPlethysmographyVentilators, Negative-PressureVasoconstrictionTilt-Table TestPressureBlood Pressure DeterminationHemodynamicsArterial PressureBlood VolumeNorepinephrineGravitationLegCardiac OutputPostureWeightlessnessContinuous Positive Airway PressureOscillometryEquipment DesignBlood Flow VelocityStroke VolumeVasomotor SystemComplianceCold TemperaturePositive-Pressure RespirationVeinsSkin TemperatureHypotensionPelvisAutonomic Nervous SystemHand StrengthCardiovascular Physiological PhenomenaPulmonary Wedge PressureRestSleep Apnea, ObstructiveExerciseBrachial ArteryMuscle, SkeletalStress, PhysiologicalMiddle Cerebral ArteryCerebrovascular CirculationTime FactorsOxygen ConsumptionReference ValuesEpinephrineSkinMusclesAir PressureElectrocardiographyReproducibility of ResultsAnalysis of VarianceSuctionHeartAbdominal Wound Closure TechniquesSkin Care