Supine PositionPostureProne PositionPatient PositioningGravitationLevobunololAirway ObstructionAcepromazineRespirationAirway ResistanceHeart RateRespiratory MechanicsAirway RemodelingMovementInteractive Ventilatory SupportTidal VolumePolysomnographyIntra-Abdominal HypertensionPulmonary Gas ExchangePressureTilt-Table TestSleep Apnea, ObstructiveBlood PressureHead-Down TiltSleepIntraocular PressureBiomechanical PhenomenaSleep Apnea SyndromesOxygenSupinationHypotension, OrthostaticLungTime FactorsSwimmingNephrostomy, PercutaneousSleep, REMElectric ImpedanceRespiratory SystemBronchiElectromyographyMolecular Sequence DataReproducibility of ResultsAnalysis of VarianceProspective StudiesAutonomic Nervous SystemBronchial HyperreactivityLung Volume MeasurementsAirway ManagementIndoraminValsalva ManeuverPharynxRespiratory MucosaPalate, SoftInhalationAsthmaSyncopeAmino Acid SequenceBaroreflexIntubation, IntratrachealBase SequenceHemodynamicsPulmonary VentilationDizzinessRespiratory Function TestsExpiratory Reserve VolumeFunctional Residual CapacityHeadSudden Infant DeathSyncope, VasovagalCardiac OutputReference ValuesPulmonary CirculationLegFluid ShiftsTongueEsophagusTechnetium Tc 99m Aggregated AlbuminRespiratory MusclesBronchoconstrictionPlethysmographyRespiration, ArtificialOropharynxTotal Lung CapacityThoracic WallEsophageal pH MonitoringRestCarbon DioxideDiaphragmVentilators, Negative-PressurePositive-Pressure RespirationRibsSleep ParalysisBlood Flow VelocityBedsVital CapacityRespiratory HypersensitivityTomography, X-Ray ComputedAutonomic Nervous System DiseasesPneumoperitoneum, ArtificialCentral Venous Pressure