Airway ObstructionAir MovementsPulmonary VentilationForced Expiratory VolumeLung Diseases, ObstructiveSpirometryAirway ResistancePulmonary Disease, Chronic ObstructiveVital CapacityRespiratory Function TestsReproducibility of ResultsRhinomanometryVentilationRespiratory MechanicsAsthmaPulmonary EmphysemaNasal CavityGlottisLungPhonationLung Volume MeasurementsLarynxBronchitisMaximal Expiratory Flow RateTime FactorsPressureRespirationSensitivity and SpecificityAir PressureEquipment DesignSmokingBronchodilator AgentsInhalationExhalationTotal Lung CapacityForced Expiratory Flow RatesObserver VariationPharynxPeak Expiratory Flow RateReference ValuesAirPlethysmography, Whole BodyRespiratory MusclesBronchiModels, AnatomicTransducers, PressureCoughSeverity of Illness IndexProspective StudiesNoseModels, BiologicalEnvironment, ControlledNasal ObstructionTomography, X-Ray ComputedIpratropiumNasal DecongestantsAdministration, InhalationHumidityAlgorithmsAlbuterolImaging, Three-DimensionalInspiratory CapacityPredictive Value of TestsComputer SimulationCross-Sectional StudiesImage Processing, Computer-AssistedBronchiectasisRheologyCalibrationAir MicrobiologyBronchial Provocation TestsAnalysis of VarianceAuscultationThoraxRespiratory SystemFunctional Residual CapacityOxygenBiological MarkersRisk FactorsTidal VolumeLinear ModelsVocal CordsAir ConditioningBronchiolesOccupational ExposureResidual Volumealpha 1-Antitrypsin DeficiencyBiomechanical PhenomenaRegression AnalysisPolysomnographyPharyngeal MusclesCarbon DioxideHydrodynamicsBronchoconstrictionMethacholine ChlorideKineticsBronchographyHeliumWork of BreathingSputum