Supine PositionProne PositionPatient PositioningPostureTilt-Table TestHead-Down TiltHeart RateSupinationHypotension, OrthostaticGravitationNephrostomy, PercutaneousBlood PressureRespiratory MechanicsMolecular Sequence DataAutonomic Nervous SystemRespirationIndoraminMovementValsalva ManeuverPressureSyncopeBaroreflexAmino Acid SequenceDizzinessBase SequenceHemodynamicsSyncope, VasovagalSudden Infant DeathHeadTidal VolumeCardiac OutputExpiratory Reserve VolumeLegPulmonary Gas ExchangeFluid ShiftsLung Volume MeasurementsPalate, SoftReference ValuesEsophagusTechnetium Tc 99m Aggregated AlbuminOxygenPulmonary CirculationEsophageal pH MonitoringTime FactorsRestSleepThoracic WallSleep ParalysisFunctional Residual CapacityBlood Flow VelocityRibsBedsInhalationLungDiaphragmPharynxCarbon DioxideAutonomic Nervous System DiseasesPlethysmographyAirway ResistancePneumoperitoneum, ArtificialVentilators, Negative-PressureCentral Venous PressurePelvisElectrocardiographyTongueRegional Blood FlowVenous PressureLymphatic IrradiationAirway ObstructionEsophageal Motility DisordersVeinsPulmonary VentilationRespiratory MusclesSpineReproducibility of ResultsTotal Lung CapacityProspective StudiesSleep Apnea, ObstructiveBlood VolumeAnesthesia, SpinalModels, MolecularNeckRespiration, ArtificialVascular ResistanceOropharynxBinding SitesIntraocular PressureMutationPolysomnographyTonometry, OcularJugular VeinsRespiratory Distress Syndrome, AdultBiomechanical PhenomenaExercise TestBlood Gas AnalysisSnoringTomography, X-Ray ComputedThoraxExercise