HyperemiaAdenosineReceptor, Adenosine A2AReceptor, Adenosine A1Adenosine DeaminaseReceptor, Adenosine A3Receptor, Adenosine A2BAdenosine KinaseAdenosine A2 Receptor AntagonistsReceptors, Adenosine A2Adenosine A2 Receptor AgonistsReceptors, Purinergic P1Adenosine A1 Receptor AntagonistsPurinergic P1 Receptor AntagonistsAdenosine A1 Receptor AgonistsRegional Blood FlowXanthinesPurinergic P1 Receptor AgonistsVasodilationAdenosine MonophosphateTheophyllineCoronary CirculationForearmAdenosine-5'-(N-ethylcarboxamide)Vasodilator AgentsAdenosine A3 Receptor AntagonistsBlood Flow VelocityLaser-Doppler FlowmetryBrachial ArteryReceptors, PurinergicDipyridamoleAdenosine A3 Receptor Agonists2-ChloroadenosinePhenethylaminesPhenylisopropyladenosineInosine5'-NucleotidaseMicrocirculationCyclic AMPDogsAdenosine TriphosphatasesTubercidinEndothelium, VascularBlood PressureAdenine NucleotidesPlethysmographyCoronary VesselsVascular ResistanceCerebrovascular CirculationNitric OxideHemodynamicsFractional Flow Reserve, MyocardialTriazinesTime FactorsPurinesAminophyllineNucleoside DeaminasesCoformycinTheobromineConstrictionDose-Response Relationship, DrugPentostatinNG-Nitroarginine Methyl EsterMuscle, SkeletalHeart RateAdenosine PhosphosulfateEnzyme InhibitorsTriazolesGlyburideProstaglandinsPerfusionHeartSkinPapaverineMyocardiumRats, Sprague-DawleyThioinosineNitric Oxide SynthaseRats, WistarAdenineIschemiaOxygen ConsumptionArteriolesomega-N-MethylarginineKineticsNitroprussideDeoxyadenosinesLegCoronary StenosisPurinergic AntagonistsRabbitsSkin TemperatureKetorolacBlood VolumePhysical ExertionInfusions, Intra-ArterialBlood CirculationArteriesSplanchnic CirculationFingers