LegBlood CirculationLeg UlcerExtracorporeal CirculationRestless Legs SyndromePulmonary CirculationCollateral CirculationEnterohepatic CirculationCerebrovascular CirculationCoronary CirculationLeg InjuriesSplanchnic CirculationRegional Blood FlowPlacental CirculationLeg Length InequalityBlood Circulation TimeExtremitiesLiver CirculationVaricose UlcerBlood Flow VelocityTreatment OutcomeVascular ResistanceTime FactorsBlood PressureMuscle, SkeletalHemodynamicsLeg DermatosesVeinsPregnancyLower ExtremityCross CirculationDogsAssisted CirculationHeart ArrestBiomechanical PhenomenaProspective StudiesCardiopulmonary ResuscitationRenal CirculationRetrospective StudiesIschemiaLiverFollow-Up StudiesPulmonary ArteryOxygen ConsumptionLaser-Doppler FlowmetryFemoral VeinVasodilationPostureCardiac OutputLeg BonesArteriesFemoral ArteryMetabolic Clearance RatePlacentaTissue DistributionOxygenVasoconstrictionHindlimbElectromyographyBandagesMaternal-Fetal ExchangeWalkingInjections, IntravenousMicrocirculationExerciseHeart RateRisk FactorsAnalysis of VarianceVertebrobasilar InsufficiencyLungFootFetusVasodilator AgentsModels, BiologicalLocomotionNocturnal Myoclonus SyndromeHalf-LifeDisease Models, AnimalCerebral ArteriesArmSheepChronic DiseaseFontan ProcedureRabbitsSwineGaitPhysical ExertionSeverity of Illness IndexPerfusionCarbon DioxidePredictive Value of TestsReference ValuesBlood VolumeBlood VesselsNitric OxideInfant, NewbornRats, Sprague-DawleyPortal SystemReproducibility of ResultsVenous Insufficiency