Laser-Doppler FlowmetryRegional Blood FlowChoroidBlood Flow VelocityLasersMicrocirculationSkinCerebrovascular CirculationDoppler EffectRetinal VesselsGingival PocketUltrasonography, DopplerSkin TemperatureInterferometryBlood PressureIontophoresisHyperemiaVasodilationUltrasonography, Doppler, ColorIntraocular PressurePulsatile FlowCerebral ArteriesOptic DiskVasoconstrictionFingersCapillariesFovea CentralisIschemiaVasodilator AgentsUltrasonography, Doppler, PulsedBlood VolumeRats, Sprague-DawleyCerebral InfarctionNitric OxideCross-Over StudiesRats, WistarHemodynamicsBrain IschemiaOxygenRheologySplanchnic CirculationNG-Nitroarginine Methyl EsterForearmBrainMiddle Cerebral ArteryNitroprussideAcetylcholineEchocardiography, Doppler, PulsedBody TemperatureNitric Oxide SynthaseOcular HypertensionPressureUltrasonography, Doppler, TranscranialHeart RateDisease Models, AnimalCalcitonin Gene-Related PeptideRetinal ArteryVasoconstrictor AgentsCerebral PalsyTime FactorsEndothelium, VascularEchocardiography, Doppler, ColorCapsaicinUltrasonographyInfusions, IntravenousPerfusionGlaucoma, Open-AngleAortic Arch SyndromesDouble-Blind MethodLasers, Solid-StateSympathetic Nervous SystemHot TemperatureDose-Response Relationship, DrugHindlimbInfarction, Middle Cerebral ArteryArginineOxygen ConsumptionLaser CoagulationAnalysis of VarianceGastric MucosaElectric StimulationCerebral AngiographyLaser Therapy, Low-LevelEnzyme InhibitorsCerebral VeinsMalaria, CerebralCase-Control StudiesCerebral HemorrhageReproducibility of ResultsRaynaud DiseaseVascular ResistanceBlood CirculationLasers, ExcimerOphthalmic ArteryUltrasonography, PrenatalSensitivity and SpecificityIschemic Attack, TransientUmbilical ArteriesCarbon DioxideNorepinephrine