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.
“A previous study of NFL football players found that a large percentage of them – around 60 percent – were considered obese,” he said. “But when you look at an athlete like that, you see that in many cases he is not obese. Many athletes have huge BMIs because of muscle mass, but in many cases are not fat.”
The answer, said Pivarnik, is instead of having one cutoff point for everyone, perhaps have different classifications for different people.
“Is a BMI of 25 for overweight and 30 for obese the right ones to use with 20- to 29-year-olds in terms of disease risk?” he asked. “Maybe it could be as simple as this: If you’re a regular exerciser or an athlete, maybe 28 is overweight for you and 33 is considered obese.”
BMI, said Pivarnik, is used as a “surrogate” for percent fat, even though body fat doesn’t really fit into the equation.
“What if you take fat out of the equation?” he said. “Is there something unique about BMI that may increase a person’s risk of chronic disease, unrelated to fatness? Are people with high BMIs but low fatness as much at risk of heart disease as other people? The answer is no one knows.”
In their research, Ode and Pivarnik used carefully measured height and weight to calculate BMI in more than 400 college-age people. They then used a standard method of measuring body fatness and found that BMI was not providing an accurate portrayal of the amount of fat a student had.
Other members of the research team included Mathew Reeves, an associate professor of epidemiology at MSU, and Jeremy Knous, a Ph.D. student in the MSU Department of Kinesiology.
Michigan State University has been advancing knowledge and transforming lives through innovative teaching, research and outreach for more than 150 years. MSU is known internationally as a major public university with global reach and extraordinary impact. Its 16 degree-granting colleges attract scholars worldwide who are interested in combining education with practical problem solving.
Tom Oswald | EurekAlert!
Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery
20.01.2017 | GSI Helmholtzzentrum für Schwerionenforschung GmbH
Seeking structure with metagenome sequences
20.01.2017 | DOE/Joint Genome Institute
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
20.01.2017 | Awards Funding
20.01.2017 | Materials Sciences
20.01.2017 | Life Sciences