If you maintain or improve your fitness level -- even if your body weight has not changed or increased -- you can reduce your risk of death, according to research reported in Circulation: Journal of the American Heart Association.
In a study of 14,345 adult men, mostly white and middle or upper class, researchers found that:
BMI is a measurement based on weight and height (kg/m2). MET measures the intensity of aerobic exercise – specifically, the ratio of metabolic rate during a specific physical activity to a reference rate of metabolic rate at rest.
"This is good news for people who are physically active but can't seem to lose weight," said Duck-chul Lee, Ph.D., the study's lead researcher and physical activity epidemiologist in the Department of Exercise Science at the University of South Carolina's Arnold School of Public Health in Columbia. "You can worry less about your weight as long as you continue to maintain or increase your fitness levels."
Results of the study underscore the importance of physical inactivity as a risk factor for death from heart disease and stroke, said researchers. Researchers also found no association between changes in body fat percentage or body weight and death risk.
Participants, who were an average 44 years old, were part of the long-term, large-scale Aerobics Center Longitudinal Study. They underwent at least two comprehensive medical exams.
Researchers used maximal treadmill tests to estimate physical fitness (maximal METs), and height and weight measurements to calculate BMI. They recorded changes in BMI and physical fitness over six years. After more than 11 years of follow-up, researchers determined the relative risks of dying among men who lost, maintained or gained fitness over six years. They accounted for other factors that can affect outcomes, including BMI change, age, family history of heart disease, beginning fitness level, changes in lifestyle factors such as smoking and physical activity, and medical conditions such as high blood pressure or diabetes.
One possible explanation for these results: about 90 percent of the men were either normal weight or overweight at the beginning of the study. Among obese people, changes in BMI might have a significant effect on death risks. So it's unclear whether these results would apply to severely obese people, Lee said.
A BMI score under 25 is considered healthy, 25 to less than 30 is overweight, and 30 or greater is obese.
Because the study was mostly done in white middle and upper class men, it's difficult to know whether the results apply to other racial and socioeconomic groups. Women would likely have similar results as the men in the study, Lee said.
American Heart Association: http://www.americanheart.org
This press release was posted to serve as a topic for discussion. Please comment below. We try our best to only post press releases that are associated with peer reviewed scientific literature. Critical discussions of the research are appreciated. If you need help finding a link to the original article, please contact us on twitter or via e-mail.
People who suffer from mental health issues also suffer from its stigma. Portraying mental illness as a good thing helps no one
The inventor of a breakthrough DNA test for Down syndrome says the technology can be used to screen people for cancer.The Hong Kong scientist who invented a simple blood test to show pregnant women if their babies have Down syndrome is now testing a similar technology for cancer.
Dr Jeremy Farrar of Wellcome Trust says international community is belatedly taking actions necessary to stem tide of disease
Miniature stomachs gastric organoids will help in study of ulcers and could be used in future to repair patients stomachs
The story of the vaccines development is just one part of a rich and intertwined history of scientific discovery and controversy
A highly sensitive blood test for Ebola exists, so why isn't it being used to test all returning health workers from West Africa? Because the virus isn't in the blood in the first stages of infection.
Drinking beverages enriched with compounds found in cocoa beans improved older adults' performances on a memory test – but there's a catch
A 700-year-old caribou dropping from northern Canada holds surprisingly well-preserved viruses. There's no evidence the viruses are dangerous, but they are scientifically interesting.
The New England Journal of Medicine published an editorial against quarantining people who have worked with Ebola patients in Africa. Renee Montagne speaks with Dr. Lindsey Baden, one of the authors.
Surgeons in Australia say they have performed the first heart transplant using a "dead heart".