Laser-Doppler FlowmetryRegional Blood FlowChoroidBlood Flow VelocityLasersMicrocirculationSkinRetinal VesselsDoppler EffectGingival PocketCerebrovascular CirculationUltrasonography, DopplerSkin TemperatureHyperemiaInterferometryIontophoresisBlood PressureVasodilationUltrasonography, Doppler, ColorIntraocular PressurePulsatile FlowOptic DiskIschemiaFingersCapillariesFovea CentralisVasoconstrictionVasodilator AgentsUltrasonography, Doppler, PulsedHemodynamicsBlood VolumeCross-Over StudiesRats, Sprague-DawleyNitric OxideRats, WistarSplanchnic CirculationForearmRheologyNG-Nitroarginine Methyl EsterOxygenBrain IschemiaNitroprussideUltrasonography, Doppler, TranscranialAcetylcholineEchocardiography, Doppler, PulsedPressureRetinal ArteryOcular HypertensionHeart RateNitric Oxide SynthaseBody TemperatureDisease Models, AnimalTime FactorsCalcitonin Gene-Related PeptideEchocardiography, Doppler, ColorVasoconstrictor AgentsEndothelium, VascularCapsaicinUltrasonographyInfusions, IntravenousPerfusionGlaucoma, Open-AngleAortic Arch SyndromesDouble-Blind MethodLasers, Solid-StateSympathetic Nervous SystemHot TemperatureArterial Occlusive DiseasesHindlimbCoronary OcclusionLaser CoagulationArginineDose-Response Relationship, DrugBalloon OcclusionGastric MucosaAnalysis of VarianceElectric StimulationRetinal Artery OcclusionRetinal Vein OcclusionBrainOxygen ConsumptionLaser Therapy, Low-LevelEnzyme InhibitorsCerebral ArteriesCase-Control StudiesCollateral CirculationRetinal VeinInfarction, Middle Cerebral ArteryOphthalmic ArteryRaynaud DiseaseBlood CirculationCerebral InfarctionDental OcclusionReproducibility of ResultsVascular ResistanceLasers, ExcimerMiddle Cerebral ArteryProspective StudiesSensitivity and SpecificityUltrasonography, Prenatal