ErgometryExercise TestExerciseHeart RateBicyclingHead Protective DevicesOxygen ConsumptionMaximal Voluntary VentilationExercise TolerancePhysical ExertionPulmonary Gas ExchangeWheelchairsArmPhysical EndurancePhysical FitnessPhysical Education and TrainingSportsExercise TherapyLegQuadriplegiaRestCardiac OutputRespiratory Function TestsCraniocerebral TraumaCardiovascular Physiological PhenomenaRespirationLactic AcidParaplegiaPulmonary VentilationDyspneaRunningBlood PressureMuscle, SkeletalWalkingCross-Over StudiesEnergy MetabolismTime FactorsHemodynamicsCarbon DioxideSpinal Cord InjuriesRegional Blood FlowOxygenStroke VolumeForced Expiratory VolumePulmonary Disease, Chronic ObstructiveAccidents, TrafficTransportationDouble-Blind MethodAnalysis of VarianceAccident PreventionEnvironment DesignReproducibility of ResultsLungWounds and InjuriesTreatment Outcome