DyspneaOxygenOxygen ConsumptionReactive Oxygen SpeciesOxygen Inhalation TherapyPulmonary Disease, Chronic ObstructiveSinglet OxygenRespiratory Function TestsExercise ToleranceDyspnea, ParoxysmalForced Expiratory VolumeExercise TestSpirometryLung Diseases, ObstructiveOxygen IsotopesSeverity of Illness IndexVital CapacityLungPartial PressureRespiratory MusclesTreatment OutcomeAnoxiaCoughHyperbaric OxygenationAirway ObstructionOximetryInspiratory CapacityTime FactorsRadiography, ThoracicBlood Gas AnalysisQuality of LifeHeart FailureBreathing ExercisesLung DiseasesRespirationAcute DiseaseProspective StudiesTomography, X-Ray ComputedOxidative StressFatal OutcomeBronchodilator AgentsHydrogen PeroxideOxidation-ReductionScopolamine DerivativesCarbon DioxideLung Diseases, InterstitialRespiratory MechanicsLung Volume MeasurementsPulmonary Gas ExchangeInhalationExerciseHemoptysisAsthmaBronchial DiseasesRisk FactorsWork of BreathingBronchoscopyPhysical ExertionRespiratory InsufficiencyPulmonary VentilationHeart NeoplasmsRetrospective StudiesMaximal Voluntary VentilationAntioxidantsQuestionnairesPulmonary Diffusing CapacityFollow-Up StudiesWalkingPulmonary EmphysemaNatriuretic Peptide, BrainTracheal NeoplasmsChronic DiseaseHypertension, PulmonaryTracheal DiseasesAdministration, InhalationDouble-Blind MethodResidual VolumeHemodynamicsPalliative CareSuperoxide DismutaseTotal Lung CapacityHemoglobinsCase-Control StudiesOxyhemoglobinsFree RadicalsPulmonary EmbolismMitochondriaAlbuterolPericardial EffusionAerobiosisCatalaseRespiration DisordersEchocardiographyChest PainFree Radical ScavengersBronchial Provocation TestsExpiratory Reserve VolumeNADPH OxidaseHyperoxiaPulmonary Fibrosis