WalkingChromosome WalkingExercise TestBiomechanical PhenomenaLocomotionGait Disorders, NeurologicExercise ToleranceOrthotic DevicesPostural BalanceEnvironment DesignExercise TherapyWalkersFootAnkle JointMobility LimitationTransportationIntermittent ClaudicationLegCanesAnkleAccelerationShoesElectromyographyMotor ActivityRunningCrutchesArtificial LimbsWeight-BearingExerciseLower ExtremityRecovery of FunctionActivities of Daily LivingGaitMuscle StrengthBicyclingDisability EvaluationMuscle, SkeletalMonitoring, AmbulatoryEnergy MetabolismKnee JointTime FactorsResidence CharacteristicsOxygen ConsumptionPostureParesisRoboticsRange of Motion, ArticularTreatment OutcomePhysical FitnessAmputeesHip JointAccidental FallsPeripheral Arterial DiseaseDyspneaPhysical ExertionQuestionnairesHipSelf-Help DevicesQuality of LifeCerebral PalsyPhysical Therapy ModalitiesMovementAnalysis of VarianceRecreationKneeHemiplegiaCross-Sectional StudiesPulmonary Disease, Chronic ObstructiveExtremitiesSpinal Cord InjuriesSeverity of Illness IndexProspective StudiesPeripheral Vascular DiseasesGravitationReproducibility of ResultsVideo RecordingAdaptation, PhysiologicalArchitectural AccessibilityFollow-Up StudiesSafetyPostpoliomyelitis SyndromePsychomotor PerformanceStrokeModels, BiologicalWeights and MeasuresPhysical EnduranceOsteoarthritis, KneeSingle-Blind MethodGeographic Information SystemsRespiratory Function TestsGeriatric AssessmentAccelerometryParaplegiaEarly AmbulationLung Diseases, ObstructivePilot ProjectsProprioceptionDependent AmbulationOrthopedic EquipmentAging