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 MethodBronchiChlorofluorocarbonsRespiratory TherapyEthanolaminesInspiratory 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 UnitsButylaminesBudesonideParasympatholyticsTracheaNasal DecongestantsBronchitisAerosol PropellantsOscillometryPulmonary VentilationResidual VolumeDyspneaTephrosiaQuinolonesTotal Lung CapacityMuscarinic AntagonistsBronchial HyperreactivityHeliumLung ComplianceTreatment OutcomePowdersDose-Response Relationship, DrugPharmaceutical SolutionsTachyphylaxisHistamineDrug LabelingCromolyn SodiumAmaranthusDrug PackagingDrug Therapy, CombinationBronchitis, ChronicProcaterolDrug ToleranceClinical Trials as TopicDrug Administration ScheduleHistamine AntagonistsAsthma, Exercise-InducedIsoproterenolGuinea PigsEphedrineRacepinephrinePlethysmography, Whole BodyAir FiltersLung Volume Measurements