SpirometryPulmonary Disease, Chronic ObstructiveForced Expiratory VolumeRespiratory Function TestsVital CapacityDyspneaBronchodilator AgentsExercise ToleranceSeverity of Illness IndexSmokingLungLung Diseases, ObstructiveAsthmaScopolamine DerivativesPulmonary MedicineAirway ObstructionAdministration, InhalationPulmonary EmphysemaAlbuterolLung DiseasesForced Expiratory Flow RatesMaximal Midexpiratory Flow RateSputumCholinergic AntagonistsExhalationRespiratory TherapyQuestionnairesBronchitis, ChronicCross-Sectional StudiesRespiratory MusclesAdrenal Cortex HormonesAirway ResistanceInspiratory CapacityQuality of LifeBreathing ExercisesEmphysemaPeak Expiratory Flow RateLung Volume MeasurementsTreatment OutcomeBronchospirometryOscillometryPulmonary Diffusing CapacityRespiration DisordersTotal Lung CapacityRespiratory Tract DiseasesBreath TestsBronchitisPlethysmography, Whole BodyBronchial Provocation TestsAdrenergic beta-2 Receptor AgonistsExercise TestOxygen Inhalation TherapyPrevalenceCase-Control StudiesPrimary Health CareReproducibility of ResultsIpratropiumCoughProspective StudiesPulmonary VentilationMaximal Expiratory Flow Rate