Exercise physiologists have discovered that routine endurance training (aerobics) causes the body to become more efficient and utilize glucose better. With type I diabetes mellitus the blood glucose concentration is too high. Consistent, low impact, exercise increases the number of structures called insulin receptors and makes those receptors have a better attraction or a higher affinity for, the blood glucose. In this way, insulin is better utilized and the blood sugar level will come down, sometimes quite substantially, it also takes less insulin to maintain the blood sugar.
Circulation is also benefited which in turn adds to the over all health of the individual. Increased circulation means an increase in blood flow which means a lower incidence of infection. The body responds to stress much more favorably when circulation is optimal.