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.
In the 1950s a group of pioneering psychiatrists showed that hallucinogenic drugs had therapeutic potential, but the research was halted as part of the backlash against the hippy counterculture.
Five years ago cognitive scientist Rafael Núñez found himself in the Upper Yupno Valley, a remote, mountainous region of Papua New Guinea. The area is home to some 8,000 indigenous people, and Núñez and his graduate student, Kensy Cooperrider, were studying their conceptions of time.
With the Ebola outbreak in West Africa doubling by the month, the World Health Organization is pushing more extreme measures to contain the virus
For the first time, researchers have tracked the spread of Ebola, almost in real time, during an outbreak. The virus is quickly changing its DNA. But it's still unclear what these mutations mean.
Think of all the adults you know. Think of your parents and grandparents. Think of the teachers you had at school, your doctors and dentists, the people who collect your rubbish, and the actors you see on TV. All of these people probably have little mites crawling, eating, sleeping, and having sex on their faces.
A trial vaccine against Ebola could be tested on healthy volunteers in the UK in September, says an international health consortium.
The ALS Association has raised more than $94 million in recent weeks via its online ice bucket challenge — compared with $2.7 million this time last year. Now what?
Implant attached to bone in pioneering technique that helps prevent infection and discomfort
A new method for removing allergens from peanuts means help could soon be on the way for the roughly 2.8 million Americans with a potentially life-threatening allergy to the popular food, the U.S. Department of Agriculture said on Tuesday.
Survey finds many social media users hesitate to express opinions unless they know their followers will agree with them