Chest Wall OscillationDrainage, PosturalMucociliary ClearanceIntermittent Positive-Pressure BreathingPositive-Pressure RespirationPercussionCystic FibrosisPhysical Therapy ModalitiesPressureRespiratory MusclesBlood PressureVentilators, Negative-PressureExpiratory Reserve VolumeForced Expiratory Flow RatesExhalationRespiratory Function TestsBreathing ExercisesMaximal Voluntary VentilationAir PressureRespiratory MechanicsTidal VolumeFunctional Residual CapacityInspiratory CapacityLung Volume MeasurementsVital CapacityPositive-Pressure Respiration, IntrinsicSpirometryWork of BreathingPulmonary VentilationHydrostatic PressureTotal Lung CapacityInhalationRespiration, ArtificialBarotraumaForced Expiratory VolumeRespiratory InsufficiencyBronchiectasisCoughBlood Gas AnalysisVentilators, MechanicalMaximal Expiratory Flow RateMuscle StrengthBlood Pressure DeterminationLung ComplianceRespiratory TherapyRespirationAirway ResistanceAirway ObstructionDyspneaValsalva ManeuverThoraxLungMuscle WeaknessMucusContinuous Positive Airway PressureIntermittent Positive-Pressure VentilationEquipment DesignTransducers, PressureHypertensionPeak Expiratory Flow RateCarbon DioxideIntracranial PressureIntraocular PressureRespiratory Distress Syndrome, AdultBlood Pressure Monitoring, AmbulatoryLung Diseases, ObstructiveSleep Apnea, ObstructiveCardiac OutputDiaphragmAtmospheric PressureOxygenVenous PressureLung DiseasesPosturePulmonary Gas ExchangePulmonary Disease, Chronic ObstructiveArterial PressureVentricular PressureHeart RateProspective StudiesTime Factors