Functional Residual CapacityLung Volume MeasurementsResidual VolumeTotal Lung CapacityLung ComplianceRespiratory MechanicsTidal VolumeRespiratory Function TestsDiaphragmExpiratory Reserve VolumePlethysmography, Whole BodyLungRespirationAirway ResistanceInhalationThoraxPlethysmographyHeliumRespiratory MusclesVital CapacityInspiratory CapacityPulmonary Gas ExchangeFlowmetersRespiratory Physiological PhenomenaSpirometrySupine PositionRibsForced Expiratory Flow RatesPositive-Pressure RespirationPulmonary VentilationPressurePhrenic NerveForced Expiratory VolumeHypergravityMaximal Expiratory Flow RateLung Diseases, ObstructiveRespiration, ArtificialProne PositionSulfur HexafluorideGravitationIntercostal MusclesRespiratory Dead SpaceNitrogenBronchoconstrictor AgentsMethacholine ChlorideAirway ObstructionCarbon DioxideAbdomenPulmonary Diffusing CapacityOxygenIndicator Dilution TechniquesPulmonary EmphysemaThoracic WallWeightlessnessVentilation-Perfusion RatioRespiratory Distress Syndrome, NewbornPostureDyspneaAnesthesia, GeneralAnesthesiaRespiratory SoundsNebulizers and VaporizersMouthPulmonary CirculationBronchodilator AgentsBronchial Provocation TestsAlbuterolBreath TestsReproducibility of ResultsBronchoconstrictionRespiration DisordersPulmonary Disease, Chronic ObstructiveAerosolsInfant, Newborn