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Lower Body Negative PressureHypovolemiaGravity SuitsFluid ShiftsForearmBody WeightHead-Down TiltBed RestOrthostatic IntoleranceDizzinessHypotension, OrthostaticBlood PressureVascular CapacitanceCentral Venous PressureHeart RateSpace FlightPressoreceptorsSupine PositionBaroreflexVascular ResistanceWeightlessness SimulationSympathetic Nervous SystemBody Mass IndexCardiovascular DeconditioningWeightlessness CountermeasuresRegional Blood FlowLegTilt-Table TestBody CompositionSyncopePosturePlethysmographyReflexExerciseGravitationBlood VolumeBody TemperatureObesityCardiac OutputHemodynamicsSouthwestern United StatesPhysical FitnessVasoconstrictionBody Temperature RegulationEnergy MetabolismBody Fat DistributionMuscle, SkeletalCold TemperatureHand StrengthAdipose TissueNorepinephrineTrimethaphanArterial PressureWalkingWeightlessnessSomatotypesBlood Flow VelocityAnthropometryMuscle StrengthLower ExtremityMotor ActivityEnergy IntakeThermogenesisAbsorptiometry, PhotonEatingSkin TemperatureTime FactorsWeight LiftingOxygen ConsumptionPressureStroke VolumeOrgan SizeCardiovascular Physiological PhenomenaAdiposityVeinsRestFeeding BehaviorVasomotor SystemAnalysis of VariancePelvisAgingHypotensionDietBody ImageSyncope, VasovagalAutonomic Nervous SystemRisk FactorsSex FactorsBasal MetabolismAge FactorsNeckPlasma VolumeCross-Sectional StudiesPhysical Education and TrainingComplianceProtein-Energy MalnutritionDietary FatsAdaptation, PhysiologicalAbdomenDiet, Vegetarian