Exercise and diabetes.

Exercise has variable effects on diabetes control. It may cause deterioration in diabetes regulation if patients are hyperglycemic, whereas it may reduce blood glucose levels in well-controlled patients. Factors influencing the magnitude of blood glucose reduction include timing of meal ingestion, peak of insulin activity and whether the extremity injected is exercised. Plasma cholesterol and triglyceride levels decrease while high-density lipoprotein levels may increase with activity.