Forced Expiratory Flow RatesPeak Expiratory Flow RateMaximal Midexpiratory Flow RateMaximal Expiratory Flow RateVital CapacityRespiratory Function TestsForced Expiratory VolumeSpirometryAsthmaPulmonary VentilationFunctional Residual CapacityTotal Lung CapacityLungAirway ObstructionAirway ResistanceLung Volume MeasurementsBronchodilator AgentsAlbuterolRespiratory MechanicsRespiration DisordersBronchial Provocation TestsRespiratory SoundsMaximal Expiratory Flow-Volume CurvesLung Diseases, ObstructiveAdministration, InhalationRespirationLung DiseasesOccupational DiseasesExpiratory Reserve VolumeCystic FibrosisRegional Blood FlowBeclomethasoneBlood Flow VelocityInspiratory CapacityResidual VolumeAnti-Asthmatic AgentsCross-Sectional StudiesNebulizers and VaporizersFlow CytometryTidal VolumeBudesonideMethacholine ChlorideTerbutalineDouble-Blind MethodHeliumExhalationIpratropiumAsthma, Exercise-InducedCoughAerosolsAir PressureBronchitisDyspneaInhalationRespiratory Tract DiseasesDustLung CompliancePregnenedionesBronchoconstrictor AgentsBronchial HyperreactivityBronchiAir PollutantsLeukotriene AntagonistsPlethysmography, Whole BodyRespiratory MusclesPressureAdrenal Cortex HormonesAtropine DerivativesBronchoconstrictionTime FactorsAerosol PropellantsAdrenergic beta-AgonistsPulsatile FlowReference ValuesEthanolaminesGene FlowPulmonary Disease, Chronic ObstructivePlethysmographyAndrostadienesRespiratory TherapyWork of Breathing