DXA: Dual-energy x-ray absorptiometry - a special type of X-ray - reveals the amount and location of fat tissue.Another version of this - air displacement plethysmography - compares the air pressure of a sealed chamber when you're in it to when you're not to identify body density, according to the University of Michigan Health. The difference between these two measurements reveals body density, per the University of Michigan Health. Underwater weighing: After being weighed normally, a person is then lowered into water and weighed there.The accuracy likely decreases if you attempt to measure on yourself, rather than having a professional use the calipers. This method is fairly accurate, according to the American Council on Exercise (ACE). Different areas are measured depending on a person's sex. Skinfold thickness: After pinching the skin, calipers (think: clamps) are used to measure the skinfold thickness (SFT) in several key areas, including the thigh, back of the arm and waist. BMI can give a false sense of good health. In medical terms, some people are classified as having metabolic obesity, normal weight (MONW) - or, more casually (and controversially), " skinny fat." Basically, this means that a person's BMI indicates a healthy weight, but their percentage of body fat is high - which is linked to all the same increases in health risks as obesity, per the Mayo Clinic.At home, though, many of us will round up our height while underreporting weight, according to an August 2013 review in Current Research in Nutrition and Food Science. If you're self-reporting, you can make errors. If your height and weight are taken at the doctor's office, you can probably count on accurate measurements.To adjust for this problem, some calculators - including 's - also ask people to plug in their age and sex. But sex matters when it comes to BMI, because people AFAB tend to have more body fat than people AMAB, even if their BMI is the same, per the CDC. BMI also doesn't take a person's sex into account. The classic BMI calculator will only look at two calculations: weight and height.(The World Health Organization recommends different BMI cutoffs for people of Asian descent.) There are differences in other populations, too - compare a Black and white person with the same BMI, and the Black person will tend to have less body fat, according to the CDC. That means for this population, the tool isn't accurately predicting risk. People of Asian descent, for instance, may have a low BMI, but high body fat percentage, per the Mayo Clinic. But treating everyone the same, regardless of ancestry, is a weakness, too. BMI doesn't take into account ethnic backgrounds. Part of the strength of BMI is that only two metrics - height and weight - are required.If an older and younger person both have the same BMI, the older person (on average) will have more body fat, per the CDC. With age, a person's body composition shifts - to a higher weight with less muscle mass. BMI underestimates body fat for older adults. BMI is also known to be inaccurate for older adults, according to the NHLBI.Because muscle weighs more than fat, athletes or other muscular folks may fall into the overweight or obesity categories of the BMI chart, according to the American Council on Exercise (ACE). It may overestimate body fat for athletes or muscular people. "The problem with BMI is it doesn't really take into account body composition," Dr.
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