Supine PositionProne PositionPatient PositioningPostureTilt-Table TestHead-Down TiltHeart RateSupinationHypotension, OrthostaticNephrostomy, PercutaneousGravitationBlood PressureRespiratory MechanicsAutonomic Nervous SystemRespirationIndoraminValsalva ManeuverSyncopeBaroreflexPressureDizzinessMovementMolecular Sequence DataHemodynamicsSyncope, VasovagalExpiratory Reserve VolumeCardiac OutputTidal VolumeSudden Infant DeathLegPulmonary Gas ExchangeFluid ShiftsLung Volume MeasurementsPalate, SoftTechnetium Tc 99m Aggregated AlbuminEsophageal pH MonitoringPulmonary CirculationEsophagusHeadRestReference ValuesBase SequenceOxygenSleepTime FactorsThoracic WallSleep ParalysisFunctional Residual CapacityBlood Flow VelocityInhalationRibsDiaphragmLungAutonomic Nervous System DiseasesPharynxBedsVentilators, Negative-PressureAirway ResistanceCarbon DioxidePlethysmographyCentral Venous PressurePneumoperitoneum, ArtificialElectrocardiographyLymphatic IrradiationEsophageal Motility DisordersRegional Blood FlowVenous PressureAmino Acid SequencePelvisAirway ObstructionVeinsPulmonary VentilationTongueRespiratory MusclesTomography, X-Ray ComputedTotal Lung CapacityBlood VolumeSleep Apnea, ObstructiveProspective StudiesVascular ResistanceSpineAnesthesia, SpinalRespiration, ArtificialIntraocular PressureTonometry, OcularPolysomnographyOropharynxNeckJugular VeinsExercise TestRespiratory Distress Syndrome, AdultBlood Gas AnalysisSnoringReproducibility of ResultsSphygmomanometersExerciseThoraxRespiratory Function TestsSympathetic Nervous SystemSignal Processing, Computer-Assisted