Peak Expiratory Flow RateForced Expiratory Flow RatesAsthmaMaximal Expiratory Flow RateForced Expiratory VolumeAlbuterolVital CapacityRespiratory Function TestsBronchodilator AgentsSpirometryAdministration, InhalationBeclomethasoneIpratropiumAtropine DerivativesNebulizers and VaporizersLungAirway ObstructionAnti-Asthmatic AgentsPulmonary VentilationAsthma, Exercise-InducedTerbutalineAerosolsMaximal Expiratory Flow-Volume CurvesLung Diseases, ObstructiveDouble-Blind MethodBronchitisBudesonideBronchial Provocation TestsDustRespiration DisordersRespiratory Tract DiseasesPregnenedionesLeukotriene AntagonistsLung Volume MeasurementsCoughAir PollutantsAirway ResistanceFenoterolRespiratory SoundsOccupational DiseasesTotal Lung CapacityCircadian RhythmMaximal Midexpiratory Flow RateTime FactorsAdrenergic beta-AgonistsClinical Trials as TopicAdrenal Cortex HormonesAcute DiseaseRespiratory MechanicsCross-Over StudiesOccupational ExposureRespirationPrednisolonePhysical ExertionProspective StudiesGlucocorticoidsRandom AllocationChronic DiseaseTreatment OutcomeMethacholine ChlorideDyspneaBronchiBlood Flow VelocityOzoneDrug Therapy, CombinationExpiratory Reserve VolumeRegional Blood FlowDrug Administration ScheduleSmokingLung DiseasesIndiaBlood VolumeBronchial HyperreactivityCross-Sectional StudiesQuestionnairesEthanolaminesFunctional Residual CapacityResidual VolumeInspiratory CapacityTidal VolumeHeart RateAerosol PropellantsAndrostadienesSeverity of Illness IndexReference ValuesBronchoconstrictor Agents