DyspneaOxygenOxygen ConsumptionPulmonary Gas ExchangeKneeHyperoxiaExercisePhysical ExertionLungMuscle, SkeletalRespirationExercise TestReactive Oxygen SpeciesKineticsOxygen Inhalation TherapyPulmonary Disease, Chronic ObstructiveSinglet OxygenRespiratory Function TestsExercise ToleranceDyspnea, ParoxysmalForced Expiratory VolumeSpirometryLung Diseases, ObstructiveOxygen IsotopesVital CapacityPartial PressureSeverity of Illness IndexRespiratory MusclesAnoxiaAirway ObstructionOximetryHyperbaric OxygenationCoughInspiratory CapacityBlood Gas AnalysisBreathing ExercisesRadiography, ThoracicQuality of LifeTreatment OutcomeBronchodilator AgentsLung DiseasesHydrogen PeroxideScopolamine DerivativesOxidation-ReductionHeart FailureTime FactorsCarbon DioxideOxidative StressRespiratory MechanicsLung Volume MeasurementsLung Diseases, InterstitialFatal OutcomeAcute DiseaseInhalationTomography, X-Ray ComputedBronchial DiseasesWork of BreathingProspective StudiesPulmonary VentilationHemoptysisAsthmaMaximal 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 EffusionRespiration DisordersNADPH OxidaseCell HypoxiaNatriuretic AgentsHeliumAnaerobiosisPhysical Endurance