The benefits of cardiac rehabilitation have been clearly demonstrated. In particular exercise training is recognized to be part of modern management after coronary artery disease. However methods of prescribing exercise-training programs and the exercise intensity are difficult to determine. The objective of this randomised clinical trial is to determine whether appropriate endurance exercise training improves the ventilatory threshold, the exercise tolerance and the quality of life in patients with coronary artery disease. Patients are randomized to continuous training or aerobic interval training respectively: 80%-versus maximal-workload at the ventilatory threshold. For each patient, the intensity of exercise training is determined by a first exercise test with gas analysis using parameters of sub maximal exercise capacity such as ventilatory threshold. Others parameters of functional capacity are also considered. Duration of the rehabilitation stage is between 7 to 10 weeks. Dyspnoea assessment at maximal intensity, quality of life measurement by SF36, drugs and events are reported. Maximal exercise tests with gas exchange measurements are performed after training program and at 6 months follow-up to compare the different cardio respiratory parameters in the two groups before and after exercise training and to evaluate the more effective endurance training program.