The aim of this study is to evaluate the improvement in skeletal muscle energetic capacity, endothelial dysfunction and glycemic control induced by physical training in 20 sedentary patients with a type 2 diabetes.The protocol consists in a physical training program with 3 sessions of 30 minutes per week during six consecutive weeks. A skeletal muscle biopsy, a cardiac and humeral artery ultrasounds, a glycemic and tensional holters will be performed before and at the end of the physical training program.