Passive Calf Stretching Therapy in Peripheral Artery Disease

Inclusion Criteria: * Presence of PAD * Stable condition (PAD symptoms) for at least 3 months * Age 40-85 * Men and women who are not pregnant or nursing Exclusion Criteria: * Ischemic leg pain at rest; critical limb ischemia (ulceration or gangrene) * Any condition other than PAD that limits the ability to walk * Major surgery or lower extremity revascularization surgery in the past 6 months * Myocardial infarction within past 6 months or unstable angina * Severe lung disease (on supplemental oxygen or frequently use rescue inhalers) * Participants with non-compressible vessels (ABI \> 1.40) * Habitual exercise (30 minutes of continuous activity on 3 or more days per week) * Current tobacco smoker or use of nicotine-containing products * Pregnant or nursing women * History or ankle reconstruction or surgery Recent history (\<1 year) of injuries to the ankle, Achilles tendon, or feet * History of rheumatoid arthritis or other degenerative joint disease * Major medical illness treatment during the prior 12 months * Uncontrolled hypertension * Uncontrolled diabetes * Inability to walk on a treadmill at a slow pace (1.0 mile/hour)