Bronchodilator AgentsAlbuterolIpratropiumForced Expiratory VolumeAsthmaTerbutalineAdministration, InhalationNebulizers and VaporizersSpirometryScopolamine DerivativesMetaproterenolAirway ResistanceVital CapacityPeak Expiratory Flow RateFenoterolLung Diseases, ObstructiveAtropine DerivativesBronchoconstrictionRespiratory Function TestsPulmonary Disease, Chronic ObstructiveAerosolsMetered Dose InhalersAdrenergic beta-AgonistsAirway ObstructionBronchial Provocation TestsAdrenergic beta-2 Receptor AgonistsInhalation SpacersClemastineMethacholine ChlorideDouble-Blind MethodBronchiRespiratory TherapyChlorofluorocarbonsEthanolaminesInspiratory CapacityRespiratory Therapy Department, HospitalMaximal Expiratory Flow RateAntitussive AgentsCholinergic AntagonistsBronchial SpasmTheophyllineNedocromilIndansAnti-Asthmatic AgentsBronchoconstrictor AgentsCross-Over StudiesForced Expiratory Flow RatesAmino AlcoholsCoughAminophyllineFunctional Residual CapacityGlycopyrrolateLungAdrenal Cortex HormonesRespiratory SoundsBeclomethasoneRespiratory Care UnitsButylaminesBudesonideParasympatholyticsTracheaBronchitisNasal DecongestantsAerosol PropellantsOscillometryPulmonary VentilationDyspneaResidual VolumeQuinolonesTephrosiaTreatment OutcomeTotal Lung CapacityMuscarinic AntagonistsBronchial HyperreactivityHeliumLung CompliancePowdersDose-Response Relationship, DrugPharmaceutical SolutionsTachyphylaxisHistamineDrug LabelingCromolyn SodiumAmaranthusDrug PackagingDrug Therapy, CombinationClinical Trials as TopicBronchitis, ChronicDrug Administration ScheduleDrug ToleranceProcaterolHistamine AntagonistsAsthma, Exercise-InducedGuinea PigsIsoproterenolTime FactorsEphedrineRacepinephrinePlethysmography, Whole BodyAir Filters