LegRegional Blood FlowBlood Flow VelocityFemoral ArteryMuscle, SkeletalExerciseHyperemiaOxygen ConsumptionFemoral VeinPhysical ExertionVascular ResistanceBlood PressureCardiac OutputVasodilationLactic AcidBicyclingHemodynamicsOxygenHeart RateExercise TestRestVasoconstrictionSupine PositionCerebrovascular CirculationPhysical Education and TrainingPostureLactatesCatecholaminesSympathetic Nervous Systemomega-N-MethylarginineLower ExtremityAgingLeg UlcerMuscle ContractionLaser-Doppler FlowmetryReference ValuesEpinephrineSplanchnic CirculationPlethysmographyTime FactorsGlucoseFlow CytometryInsulinMusclesRestless Legs SyndromePulsatile FlowBlood GlucoseXenon RadioisotopesMicrospheresDogsMicrocirculationRenal CirculationLiver CirculationPulmonary CirculationTomography, Emission-ComputedRheologyCarbon DioxideUltrasonography, DopplerBrainOxygen RadioisotopesUltrasonography, Doppler, ColorXenonBlood VolumeGene FlowBlood Circulation TimeHindlimbArteriesVasodilator AgentsCollateral CirculationIschemiaCerebral ArteriesLeg InjuriesModels, CardiovascularCapillariesUltrasonography, Doppler, TranscranialNitric OxideExtremitiesPartial PressureBlood Gas AnalysisSkin TemperatureSkinLeg Length InequalityMiddle Cerebral ArteryRetinal VesselsAntipyrinePerfusionVasomotor SystemChoroidRats, Sprague-DawleyBrain IschemiaAdenosineSheepTomography, Emission-Computed, Single-PhotonNitrogen RadioisotopesMagnetic Resonance ImagingTechnetium Tc 99m ExametazimeOximesSwineNitroprussideArterioles