Bronchoconstrictor AgentsBronchodilator AgentsBronchoconstrictionAlbuterolAirway ResistanceBronchiBronchial Provocation TestsIpratropiumAsthmaMethacholine ChlorideForced Expiratory VolumeAdministration, InhalationHistamineTerbutalineMethacholine CompoundsAerosolsGuinea PigsRespiratory Function TestsBronchial HyperreactivityNebulizers and VaporizersCromolyn SodiumNedocromilSpirometryScopolamine DerivativesLungVagotomyNeurokinin AProstaglandins DMetaproterenolBenzeneacetamidesDouble-Blind MethodVital CapacityHydantoinsDose-Response Relationship, DrugPeak Expiratory Flow RateFenoterolTracheaLung Diseases, ObstructiveAtropine DerivativesPulmonary Disease, Chronic ObstructiveMetered Dose InhalersReceptors, Neurokinin-2Adrenergic beta-AgonistsAirway ObstructionMuscle, SmoothAdrenergic beta-2 Receptor AgonistsInhalation SpacersVagus NerveThromboxane A2Respiratory SystemClemastineTachykininsSRS-ANerve BlockPropranololNeprilysinChlorofluorocarbonsRespiratory TherapyAtropineIndomethacinEthanolaminesCapsaicinInspiratory CapacitySubstance PRespiratory Therapy Department, HospitalMaximal Expiratory Flow RateAntitussive AgentsCholinergic AntagonistsBronchial SpasmTheophyllineProstaglandin D2IndansAnti-Asthmatic AgentsCross-Over StudiesHeart BlockForced Expiratory Flow RatesAmino AlcoholsTime FactorsCoughAminophyllineFunctional Residual CapacityGlycopyrrolateAllergensOvalbuminAdrenal Cortex HormonesRespiratory SoundsBeclomethasoneSerotoninMuscle ContractionButylaminesRespiratory Care UnitsParasympatholyticsBudesonideAcetylcholineNasal DecongestantsBronchitisAerosol PropellantsOscillometryPulmonary VentilationDyspnea