Laser-Doppler FlowmetryRegional Blood FlowChoroidBlood Flow VelocityLasersMicrocirculationSkinDoppler EffectRetinal VesselsGingival PocketCerebrovascular CirculationUltrasonography, DopplerSkin TemperatureInterferometryIontophoresisHyperemiaBlood PressureVasodilationUltrasonography, Doppler, ColorIntraocular PressurePulsatile FlowOptic DiskFingersFovea CentralisVasoconstrictionCapillariesIschemiaVasodilator AgentsUltrasonography, Doppler, PulsedCross-Over StudiesBlood VolumeNitric OxideRheologyHemodynamicsSplanchnic CirculationRats, Sprague-DawleyRats, WistarHeart RateForearmNG-Nitroarginine Methyl EsterOxygenNitroprussideAcetylcholineEchocardiography, Doppler, PulsedOcular HypertensionUltrasonography, Doppler, TranscranialPressureNitric Oxide SynthaseBody TemperatureRetinal ArteryCalcitonin Gene-Related PeptideEchocardiography, Doppler, ColorVasoconstrictor AgentsTime FactorsCapsaicinEndothelium, VascularUltrasonographyGlaucoma, Open-AngleInfusions, IntravenousDisease Models, AnimalDouble-Blind MethodSympathetic Nervous SystemAortic Arch SyndromesHot TemperatureLasers, Solid-StatePerfusionBrain IschemiaAnalysis of VarianceHindlimbDose-Response Relationship, DrugGastric MucosaLaser CoagulationArginineElectric StimulationReproducibility of ResultsOxygen ConsumptionLaser Therapy, Low-LevelEnzyme InhibitorsBrainCase-Control StudiesRaynaud DiseaseSensitivity and SpecificityBlood CirculationLasers, ExcimerOphthalmic ArteryUltrasonography, PrenatalRetinal VeinVascular ResistanceTympanic MembraneFootToesUmbilical ArteriesObserver VariationProspective StudiesNorepinephrine