HyperemiaRegional Blood FlowForearmVasodilationCoronary CirculationBrachial ArteryAdenosineLaser-Doppler FlowmetryBlood Flow VelocityVasodilator AgentsMicrocirculationPlethysmographyEndothelium, VascularCerebrovascular CirculationBlood PressureVascular ResistanceFractional Flow Reserve, MyocardialDogsNitric OxideCoronary VesselsDipyridamoleConstrictionHemodynamicsTheophyllineNG-Nitroarginine Methyl EsterMuscle, SkeletalSkinLegTime FactorsSkin TemperatureKetorolacProstaglandinsomega-N-MethylarginineNitric Oxide SynthaseFingersBlood Circulation