Myocardial Oxygen Consumption Index in Patients with Coronary Artery Disease

One hundred and thirty-six men with coronary artery disease were randomly assigned to a hospital-based or home-based exercise program of 3 sessions per week. A treadmill test was carried out with the modified Naughton protocol. After 3 months, 125 patients (92%) with a mean age of 55 +/- 11 years had completed the study. Maximum workload achieved increased by 65% (12.40 +/- 1.32 vs. 7.50 +/- 0.85 metabolic equivalent units (METs) in the hospital-based group, and by 17% (8.86 +/- 0.9 vs. 7.56 +/- 0.78 METs) in the home-based group ( p = 0.0001). The heart rate-blood pressure product, an index of myocardial oxygen consumption, decreased at rest by 19% in the hospital-based group but was unchanged in the home-based group ( p = 0.0001). The heart rate-blood pressure product at 5 and 7 METs activity level decreased 28% and 26%, respectively, in the hospital-based group vs. 8% and 2% in the home-based group ( p = 0.0001). It was concluded that hospital-based exercise training in patients with coronary artery disease improves functional capacity and decreases the myocardial oxygen consumption index at rest and during exercise.