Lower Body Negative PressureHypovolemiaForearmHead-Down TiltOrthostatic IntoleranceBed RestVascular CapacitanceCentral Venous PressureDizzinessBlood PressureHypotension, OrthostaticPressoreceptorsCardiovascular 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 SystemCold TemperatureComplianceVeinsSkin TemperatureHypotensionPelvisAutonomic Nervous SystemHand StrengthCardiovascular Physiological PhenomenaPulmonary Wedge PressureRestExerciseBrachial ArteryMuscle, SkeletalDrug ToleranceStress, PhysiologicalMiddle Cerebral ArteryCerebrovascular CirculationTime FactorsOxygen ConsumptionImmune ToleranceReference ValuesEpinephrineSkinMusclesAir PressureElectrocardiographyAnalysis of VarianceHeartSuctionAbdominal Wound Closure TechniquesSkin CareAging