Lower Body Negative PressureTestosteroneHypogonadismHypovolemiaForearmHead-Down TiltBed RestOrthostatic IntoleranceVascular CapacitanceDizzinessCentral Venous PressureBlood PressureEunuchismPressoreceptorsHypotension, OrthostaticCardiovascular DeconditioningHeart RateBaroreflexGravity SuitsSympathetic Nervous SystemSupine PositionVascular ResistanceWeightlessness SimulationWeightlessness CountermeasuresSpace FlightRegional Blood FlowReflexSyncopeNegative-Pressure Wound TherapyPlethysmographyVentilators, Negative-PressureAndrogensSex Hormone-Binding GlobulinVasoconstrictionEndocrine System DiseasesTilt-Table TestPressureHemodynamicsArterial PressureBlood VolumeNorepinephrineGravitationLegCardiac OutputWeightlessnessPostureBlood Flow VelocityStroke VolumeVasomotor SystemHormone Replacement TherapyLuteinizing HormoneComplianceCold TemperatureVeinsSkin TemperatureHypotensionPelvisHand StrengthAutonomic Nervous SystemCardiovascular Physiological PhenomenaRestPulmonary Wedge PressureExerciseBrachial ArteryMuscle, SkeletalStress, PhysiologicalMiddle Cerebral ArteryTime FactorsCerebrovascular CirculationReference ValuesOxygen ConsumptionAnalysis of VarianceEpinephrineSkinMusclesAgingElectrocardiographyAir PressureHeartSuctionAbdominal Wound Closure TechniquesSkin Care