http://newsroom.msu.edu/site/indexer/3009/content.htmResearch shows BMI often not an accurate indicator of body fat
March 5, 2007
EAST LANSING, Mich. — Body mass index, or BMI, long considered the standard for measuring the amount of fat in a person’s body, may not be as accurate as originally thought, according to new research.
A research team from Michigan State University and Saginaw Valley State University measured the BMI of more than 400 college students – some of whom were athletes and some not – and found that in most cases the student’s BMI did not accurately reflect his or her percentage of body fat.
The research is published in the March issue of Medicine and Science in Sports and Exercise, the official journal of the American College of Sports Medicine.
BMI is determined by this equation: A person’s weight divided by his or her height squared. Generally a BMI of 25 or above indicates a person is overweight; 30 or above indicates obesity. A person with a higher BMI is thought to be at a greater risk of heart disease, diabetes and other weight-related problems.
“The overlying issue is the same criteria for BMI are used across the board,” said Joshua Ode, a Ph.D. student in the MSU Department of Kinesiology and an assistant professor of kinesiology at Saginaw Valley. “Whether you’re an athlete or a 75-year-old man, all the same cut points are used.”
“BMI should be used cautiously when classifying fatness, especially among college-age people,” said Jim Pivarnik, an MSU professor of kinesiology and epidemiology. “It really doesn’t do a good job of saying how fat a person really is.”
The problem, especially among younger people and athletes, is that BMI does not distinguish between body fat and muscle mass, said Ode.
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