Intermittent ClaudicationPeripheral Vascular DiseasesWalkingPeripheral Arterial DiseaseAnkleLegAnkle Brachial IndexArterial Occlusive DiseasesExercise TherapyLower ExtremityExercise TestPopliteal ArteryIschemiaBrachial ArteryNafronylFemoral ArteryExercise ToleranceIliac ArteryAngioplasty, BalloonPhosphodiesterase 3 InhibitorsSpinal StenosisTrichloroepoxypropaneTreatment OutcomeTibial ArteriesVascular PatencyQuality of LifeProspective StudiesFollow-Up StudiesAngioplastyPentoxifyllineTime FactorsButtocksAngiographyRecovery of FunctionSpinal CanalVascular Surgical ProceduresRegional Blood FlowEndarterectomyTetrazolesArteriosclerosis ObliteransBlood PressureAlprostadilDiuretics, OsmoticSeverity of Illness IndexUltrasonography, Doppler, DuplexAmputationRisk FactorsQuestionnairesBlood ViscosityDouble-Blind MethodPlatelet Aggregation InhibitorsFibrinogenPainFootCardiovascular AgentsVasodilator AgentsLumbar VertebraeConstriction, PathologicActigraphyAngiography, Digital SubtractionBlood Vessel Prosthesis