3. Symptomatic coronary artery disease; unstable angina; myocardial infarction, transient ischemic attack or stroke within 6 months; uncontrolled hypertension (systolic>160 mm HG or diastolic >100 mm Hg at time of screening); current congestive heart failure; history of cardiac arrhythmia (benign PACs and PVCs allowed). Subjects with asymptomatic coronary artery disease (e.g., CABG, stent placement or angioplasty) may participate if negative stress test within 1 year prior to screening and written clearance from cardiologist documented.