Bronchodilator AgentsAlbuterolNebulizers and VaporizersIpratropiumAdministration, InhalationAsthmaForced Expiratory VolumeTerbutalineSpirometryScopolamine DerivativesMetaproterenolAirway ResistanceVital CapacityFenoterolAtropine DerivativesPeak Expiratory Flow RateBronchoconstrictionMetered Dose InhalersLung Diseases, ObstructiveRespiratory Function TestsAerosol PropellantsPulmonary Disease, Chronic ObstructiveAerosolsBronchial Provocation TestsAirway ObstructionInhalation SpacersAdrenergic beta-AgonistsAdrenergic beta-2 Receptor AgonistsChlorofluorocarbonsMethacholine ChlorideBronchiLungRespiratory TherapyClemastineDouble-Blind MethodAir MicrobiologyBronchial SpasmMaximal Expiratory Flow RateEthanolaminesAntitussive AgentsInspiratory CapacityCoughRespiratory Therapy Department, HospitalBeclomethasoneNedocromilBronchoconstrictor AgentsCholinergic AntagonistsAnti-Asthmatic AgentsParticle SizeForced Expiratory Flow RatesCross-Over StudiesTheophyllinePowdersIndansAmino AlcoholsFunctional Residual CapacityAminophyllineGlycopyrrolateBudesonideAdrenal Cortex HormonesTracheaRespiratory SoundsCromolyn SodiumBronchitisBronchial HyperreactivityPulmonary VentilationRespiratory Care UnitsButylaminesNasal DecongestantsAcid RainParasympatholyticsHeliumLung ComplianceTotal Lung CapacityResidual VolumeAtmosphereHistamineGuinea PigsInhalation ExposureOscillometryDose-Response Relationship, DrugHumidityDyspneaTephrosiaQuinolonesTreatment OutcomeMuscarinic AntagonistsClinical Trials as TopicTime FactorsAir MovementsEquipment DesignAsthma, Exercise-InducedPharmaceutical SolutionsTachyphylaxisDrug Therapy, CombinationRespiratory SystemHistamine AntagonistsProcaterolDrug LabelingDrug Administration Schedule