DyspneaOxygenHypoxia-Inducible Factor 1, alpha SubunitAnoxiaCell HypoxiaOxygen ConsumptionReactive Oxygen SpeciesOxygen Inhalation TherapyPulmonary Disease, Chronic ObstructiveSinglet OxygenRespiratory Function TestsExercise ToleranceDyspnea, ParoxysmalForced Expiratory VolumeExercise TestSpirometryLung Diseases, ObstructiveOxygen IsotopesVital CapacityPartial PressureSeverity of Illness IndexRespiratory MusclesLungAirway ObstructionOximetryHyperbaric OxygenationCoughInspiratory CapacityBlood Gas AnalysisBreathing ExercisesRadiography, ThoracicQuality of LifeRespirationTreatment OutcomeBronchodilator AgentsLung DiseasesHydrogen PeroxideScopolamine DerivativesOxidation-ReductionHeart FailureTime FactorsCarbon DioxideOxidative StressRespiratory MechanicsLung Volume MeasurementsLung Diseases, InterstitialFatal OutcomePulmonary Gas ExchangeAcute DiseaseInhalationTomography, X-Ray ComputedBronchial DiseasesWork of BreathingExerciseProspective StudiesPulmonary VentilationHemoptysisAsthmaPhysical ExertionMaximal Voluntary VentilationHeart NeoplasmsPulmonary Diffusing CapacityTracheal NeoplasmsRespiratory InsufficiencyWalkingBronchoscopyTracheal DiseasesPulmonary EmphysemaNatriuretic Peptide, BrainAdministration, InhalationResidual VolumeAntioxidantsTotal Lung CapacityPalliative CareOxyhemoglobinsDouble-Blind MethodAlbuterolHypertension, PulmonaryHemodynamicsAerobiosisSuperoxide DismutaseHemoglobinsFree RadicalsPulmonary EmbolismQuestionnairesFree Radical ScavengersBronchial Provocation TestsExpiratory Reserve VolumeMitochondriaCatalasePericardial EffusionHyperoxiaRespiration DisordersNADPH OxidaseNatriuretic AgentsHeliumAnaerobiosisPhysical EnduranceTracheal StenosisExercise Therapy