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Inactivity linked to risk factors for Type 2 diabetes

Date:
August 23, 2011
Source:
University of Missouri-Columbia
Summary:
As the number of people diagnosed with diabetes continues to grow, researchers are focusing on discovering why the prevalence of the disease is increasing. New research finds that ceasing regular physical activity impairs glycemic control (control of blood sugar levels), suggesting that inactivity may play a key role in the development of Type 2 diabetes.

Seventy-nine million American adults have prediabetes and will likely develop diabetes later in life, according to the U.S. Centers for Disease Control and Prevention. As the number of people diagnosed with diabetes continues to grow, researchers are focusing on discovering why the prevalence of the disease is increasing. John Thyfault, an assistant professor in MU's departments of Nutrition and Exercise Physiology and Internal Medicine, has found that ceasing regular physical activity impairs glycemic control (control of blood sugar levels), suggesting that inactivity may play a key role in the development of type 2 diabetes.

"We now have evidence that physical activity is an important part of the daily maintenance of glucose levels," Thyfault said. "Even in the short term, reducing daily activity and ceasing regular exercise causes acute changes in the body associated with diabetes that can occur before weight gain and the development of obesity."

Thyfault studied the relationship between low levels of physical activity and elevated levels of postprandial glucose (PPG), or the spikes in blood sugar that occur after a meal. PPG is a risk factor for the development of type 2 diabetes and has been associated with increased incidences of cardiovascular disease and death. Thyfault found that when healthy individuals reduced their physical activity by about half for three days, their PPG responses to meals doubled.

"A single bout of moderate exercise can improve the way the body maintains glucose homeostasis (blood glucose regulation) and reduce PPG, but becoming inactive for a short period of time quickly disrupts glucose homeostasis," Thyfault said. "This study shows that physical activity directly impacts health issues that are preventable."

In the study, Thyfault monitored the activity levels and diets of healthy and moderately active young adults. Participants then reduced their physical activity by 50 percent for three days while replicating the diet they consumed when they were active. Continuous glucose monitors worn by the subjects during the period of inactivity revealed significantly increased levels of PPG. Spikes in blood glucose after meals can indicate increased risks for type 2 diabetes and cardiovascular disease.

"It is recommended that people take about 10,000 steps each day," Thyfault said. "Recent evidence shows that most Americans are only taking about half of that, or 5,000 steps a day. This chronic inactivity leads to impaired glucose control and increases the risk of developing diabetes."

The study is being published in Medicine & Science in Sports & Exercise. It was funded by the University of Missouri Institute for Clinical and Translational Sciences, the MU Research Council and the National Institutes of Health (NIH). The Department of Nutrition and Exercise Physiology is jointly administered by MU's College of Agriculture, Food and Natural Resources, College of Human Environmental Sciences and School of Medicine. Thyfault has a joint appointment in the Department of Internal Medicine in the School of Medicine.


Story Source:

The above story is based on materials provided by University of Missouri-Columbia. Note: Materials may be edited for content and length.


Journal Reference:

  1. Catherine R. Mikus, Douglas J. Oberlin, Jessica L. Libla, Angelina M. Taylor, Frank W. Booth, John P. Thyfault. Lowering Physical Activity Impairs Glycemic Control in Healthy Volunteers. Medicine & Science in Sports & Exercise, 2011; DOI: 10.1249/MSS.0b013e31822ac0c0

Cite This Page:

University of Missouri-Columbia. "Inactivity linked to risk factors for Type 2 diabetes." ScienceDaily. ScienceDaily, 23 August 2011. <www.sciencedaily.com/releases/2011/08/110823165448.htm>.
University of Missouri-Columbia. (2011, August 23). Inactivity linked to risk factors for Type 2 diabetes. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2011/08/110823165448.htm
University of Missouri-Columbia. "Inactivity linked to risk factors for Type 2 diabetes." ScienceDaily. www.sciencedaily.com/releases/2011/08/110823165448.htm (accessed July 25, 2014).

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