Blood Flow VelocityUltrasonography, Doppler, TranscranialUltrasonography, Doppler, ColorOphthalmic ArteryUltrasonography, DopplerPulsatile FlowEchocardiography, DopplerUltrasonography, Doppler, PulsedMiddle Cerebral ArteryCerebrovascular CirculationEchoencephalographyCerebral ArteriesRegional Blood FlowHemodynamicsRheologyEchocardiographyMovementMyocardial ContractionVascular ResistancePostural BalanceBlood PressureProspective StudiesUltrasonography, PrenatalHeart RateLegTime FactorsReference ValuesHeartReproducibility of ResultsPregnancyNeural ConductionDiastoleBiomechanical PhenomenaEchocardiography, Doppler, PulsedSystoleRotationEchocardiography, Doppler, ColorAccelerationNystagmus, PhysiologicReflex, Vestibulo-OcularEye MovementsMitral ValvePulse Wave AnalysisCoronary CirculationPulseMotion PerceptionPursuit, SmoothVentricular Function, LeftMuscle ContractionKineticsModels, CardiovascularElasticityAction PotentialsLaser-Doppler FlowmetryHead MovementsIsotonic ContractionDoppler EffectHydrodynamicsModels, BiologicalArteriesAir MovementsRetinal ArteryGaitUmbilical ArteriesAtrial Function, LeftSaccadesElectromyographyHeart VentriclesVentricular Dysfunction, LeftMuscle, SkeletalIsometric ContractionUltrasonography, Doppler, DuplexMotionNystagmus, OptokineticUltrasonographyStroke VolumeVideo RecordingVestibule, LabyrinthStress, MechanicalPostureMicrocirculationObserver VariationDogsComputer SimulationViscosityPredictive Value of TestsPhysical PhenomenaAnkleAnalysis of VarianceVentricular FunctionWater MovementsMotor NeuronsSensitivity and SpecificityCatsAortaUlnar NerveHemorheologyReaction TimeMathematicsSwimming