Peak Expiratory Flow RateForced Expiratory Flow RatesAsthmaMaximal Expiratory Flow RateForced Expiratory VolumeAlbuterolVital CapacityRespiratory Function TestsBronchodilator AgentsSpirometryAdministration, InhalationBeclomethasoneIpratropiumAtropine DerivativesNebulizers and VaporizersAirway ObstructionLungAnti-Asthmatic AgentsPulmonary VentilationAsthma, Exercise-InducedTerbutalineAerosolsMaximal Expiratory Flow-Volume CurvesLung Diseases, ObstructiveDouble-Blind MethodBronchitisBudesonideBronchial Provocation TestsDustRespiration DisordersRespiratory Tract DiseasesPregnenedionesLeukotriene AntagonistsCoughAir PollutantsFenoterolAirway ResistanceRespiratory SoundsLung Volume MeasurementsOccupational DiseasesTotal Lung CapacityCircadian RhythmMaximal Midexpiratory Flow RateAdrenergic beta-AgonistsClinical Trials as TopicAdrenal Cortex HormonesTime FactorsAcute DiseaseCross-Over StudiesRespiratory MechanicsOccupational ExposurePrednisoloneRespirationPhysical ExertionGlucocorticoidsProspective StudiesRandom AllocationChronic DiseaseMethacholine ChlorideTreatment OutcomeOzoneBronchiDyspneaDrug Therapy, CombinationBlood Flow VelocityRegional Blood FlowDrug Administration ScheduleExpiratory Reserve VolumeSmokingLung DiseasesIndiaBronchial HyperreactivityCross-Sectional StudiesQuestionnairesEthanolaminesTidal VolumeInspiratory CapacityAerosol PropellantsFunctional Residual CapacityAndrostadienesHeart Rate