Peak Expiratory Flow RateForced Expiratory Flow RatesAsthmaMaximal Expiratory Flow RateForced Expiratory VolumeAlbuterolVital CapacityRespiratory Function TestsBronchodilator AgentsSpirometryAdministration, InhalationBeclomethasoneAnti-Asthmatic AgentsIpratropiumNebulizers and VaporizersAtropine DerivativesLungAirway ObstructionAsthma, Exercise-InducedPulmonary VentilationTerbutalineAerosolsDouble-Blind MethodLung Diseases, ObstructiveMaximal Expiratory Flow-Volume CurvesBronchitisBudesonideBronchial Provocation TestsDustRespiratory Tract DiseasesPregnenedionesLeukotriene AntagonistsRespiration DisordersRespiratory SoundsCoughAir PollutantsAirway ResistanceFenoterolOccupational DiseasesLung Volume MeasurementsTotal Lung CapacityAdrenal Cortex HormonesCircadian RhythmMaximal Midexpiratory Flow RateAdrenergic beta-AgonistsClinical Trials as TopicTime FactorsAcute DiseaseCross-Over StudiesOccupational ExposureRespiratory MechanicsPrednisoloneGlucocorticoidsRespirationMethacholine ChloridePhysical ExertionProspective StudiesBronchial HyperreactivityChronic DiseaseBronchiTreatment OutcomeRandom AllocationOzoneDyspneaDrug Therapy, CombinationSmokingQuestionnairesDrug Administration ScheduleBlood Flow VelocityCross-Sectional StudiesRegional Blood FlowExpiratory Reserve VolumeLung DiseasesEthanolaminesIndiaHypersensitivity, ImmediateSeverity of Illness IndexBronchoconstrictor AgentsAndrostadienesAerosol PropellantsEnvironmental ExposureTidal VolumeSkin TestsFunctional Residual CapacityInspiratory CapacityCromolyn SodiumHypersensitivityHeart RateAnti-Inflammatory AgentsExhalation