Aug 7, 2012 by EDITOR
Weight Training Combined With Aerobic Exercise Reduces Diabetes by Almost 60 Percent
Men who do weight training regularly may be able to reduce their risk of type 2 diabetes by up to 34%, according to a new study by Harvard School of Public Health (HSPH) and University of Southern Denmark researchers. And if they combine weight training and aerobic exercise, such as brisk walking or running, they may be able to reduce their risk even further -- up to 59%.
This is the first study to examine the role of weight training in the prevention of type 2 diabetes. The results suggest that, because weight training appears to confer significant benefits independent of aerobic exercise, it can be a valuable alternative for people who have difficulty with the latter.
The study will be published online in Archives of Internal Medicine on August 6, 2012.
"Imagine an inexpensive pill that could decrease blood sugar average, reduce cardiovascular death by 25 percent, and substantially improve functional capacity (strength, endurance, and bone density)," Dr. William Kraus of Duke Medical School and Dr. Benjamin Levine of the University of Texas Southwestern Medical Center wrote in a commentary. They said doctors should prescribe exercise to every diabetes patient.
"Until now, previous studies have reported that aerobic exercise is of major importance for type 2 diabetes prevention," said lead author Anders Grontved, visiting researcher in the Department of Nutrition at HSPH and a doctoral student in exercise epidemiology at the University of Southern Denmark. "But many people have difficulty engaging in or adhering to aerobic exercise. These new results suggest that weight training, to a large extent, can serve as an alternative to aerobic exercise for type 2 diabetes prevention."
The more lifestyle changes people make, the better. But achieving at least some changes is better than not trying at all. For example, weight loss does not appear to be an absolutely essential part of the equation, the report indicates.
Although even modest weight loss conferred a much lower risk of diabetes, those who participated in four hours of exercise per week--even if they did not achieve their weight loss goal--had a reduction in diabetes risk, investigators have found.
"It is likely that any type of physical activity--whether sports, household work, gardening or work-related physical activity--is similarly beneficial in preventing diabetes," according to researcher Dr. Jaakko Tuomilehto of the National Public Health Institute in Helsinki and colleagues.
Type 2 diabetes is a major public health concern and it's on the rise. An estimated 346 million people worldwide have type 2 diabetes, and diabetes-related deaths are expected to double between 2005 and 2030, according to the World Health Organization. More than 80% of these deaths occur in low- and middle-income countries.
The researchers, including senior author Frank Hu, professor of nutrition and epidemiology at HSPH, followed 32,002 men from the Health Professionals Follow-up Study from 1990 to 2008. Information on how much time the men spent each week on weight training and aerobic exercise came from questionnaires they filled out every two years. The researchers adjusted for other types of physical activity, television viewing, alcohol and coffee intake, smoking, ethnicity, family history of diabetes, and a number of dietary factors. During the study period, there were 2,278 new cases of diabetes among the men followed.
The findings showed that even a modest amount of weight training may help reduce type 2 diabetes risk. The researchers categorized the men according to how much weight training they did per week -- between 1 and 59 minutes, between 60 and 149 minutes, and at least 150 minutes -- and found that the training reduced their type 2 diabetes risk by 12%, 25%, and 34%, respectively, compared with no weight training. Aerobic exercise is associated with significant benefits as well, the researchers found -- it reduced the risk of type 2 diabetes by 7%, 31%, and 52%, respectively, for the three categories above.
The researchers also found that the combination of weight training and aerobic exercise confers the greatest benefits: Men who did more than 150 minutes of aerobics as well as at least 150 minutes of weight training per week had a 59% reduced risk of type 2 diabetes.
Grontved said that further research is needed to confirm the results of the study as well as to analyze whether or not the findings can be generalized to women.
"This study provides clear evidence that weight training has beneficial effects on diabetes risk over and above aerobic exercise, which are likely to be mediated through increased muscle mass and improved insulin sensitivity," said Hu. "To achieve the best results for diabetes prevention, resistance training can be incorporated with aerobic exercise."