Lower Body Negative PressureTestosteroneHypogonadismHypovolemiaForearmHead-Down TiltBed RestOrthostatic IntoleranceVascular CapacitanceCentral Venous PressureDizzinessBlood PressureEunuchismPressoreceptorsHypotension, OrthostaticCardiovascular DeconditioningBaroreflexHeart RateGravity 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 VolumeHormone Replacement TherapyVasomotor SystemLuteinizing HormoneComplianceCold TemperatureVeinsSkin TemperatureHypotensionPelvisHand StrengthAutonomic Nervous SystemCardiovascular Physiological PhenomenaPulmonary Wedge PressureRestExerciseBrachial ArteryMuscle, SkeletalStress, PhysiologicalMiddle Cerebral ArteryCerebrovascular CirculationTime FactorsReference ValuesOxygen ConsumptionEpinephrineSkinMusclesAnalysis of VarianceAir PressureAgingElectrocardiographyHeartSuctionAbdominal Wound Closure TechniquesSkin Care