Exercise, dietary changes and medication have long been the cornerstones of managing type 2 diabetes. But few studies examine how exercise actually benefits these patients.//

Now, a new systematic review shows that exercise helps regulate blood glucose (sugar) levels, increases the body’s sensitivity to insulin, and decreases blood lipids (fats) while also helping to burn body fat.

“Type 2 diabetes is an increasing problem in Western societies and is associated with increased rates of overweight and obesity,” said review co-author Elizabeth Elliott, M.D., of the University of Sydney and Children’s Hospital at Westmead, in Australia. “In this study, we wanted to determine if there was an independent effect of exercise — separate from dietary modification and medications — in improving outcomes in patients with type 2 diabetes.”

The review appears in the current issue of The Cochrane Library, a publication of The Cochrane Collaboration, an international organization that evaluates research in all aspects of health care. Systematic reviews draw evidence-based conclusions about medical practice after considering both the content and quality of existing trials on a topic.

The study, which reviewed data from 14 randomized controlled trials, included a total of 377 participants. The average age range in studies was 45 to 65 years with slightly more men than women. All participants had type 2 diabetes and the only difference between groups was that they were assigned to either no exercise or to a prescribed exercise regime.

The types of exercise programs in each study varied widely. Resistance training and aerobic workouts were the most common, although one study involved qi gong.

Exercise sessions varied from one to seven times a week, with most studies involving three sessions a week. Sessions lasted from 30 minutes to two hours, with half the studies using hour-long sessions. The studies were short te
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