![]() “You can see where the fat is,” says Dunbar. “One of the benefits of DEXA is you can get the regional distribution,” says Dunbar. Also, with DEXA, you find out exactly where your fat is located it can actually tell you the amount of belly fat you have. ProsĪccording to Capital Blue’s Medical Policy, DEXA’s accuracy is up to par with other forms of analyzing body composition. In a DEXA scan, you lie down and receive a scan of your body composition and bone mineral density. DEXA systems use a source that generates x-rays at two energies to estimate bone mineral content and soft tissue composition. There you lose some accuracy.”ĭual Energy X Ray Absorptiometry (DEXA) How It Works Some people use the Bod Pod and they don’t do the lung volume measurement they just estimate lung volume from a person’s height, weight, gender and so on. “The Bod Pod is very sensitive to baggy clothing so you have to wear clothing that is form fitting and doesn’t have cotton in it because cotton traps air and the air compresses differently,” says Christopher Dunbar, PhD, MPH, CCEP, RCEP, FACSM. There are certain things you must do in order for the rest to work properly. Since the procedure was so carefree, it’s hard to point to any negative aspect. “Depending on the population measured, the error can be as low as 1-2 percent.” Cons “BodPod is very accurate when compared with HW,” says Weil. The results are printed immediately and you also get your resting metabolic rate (RMR) and total energy expenditure estimates (TEE). Recent research, such as this 2003 European Clinical Journal of Nutrition study and this 2002 American Journal of Clinical Nutrition study shows that the Bod Pod is safe and accurate for body composition analysis. We tried a Bod Pod and it only took a few minutes to complete two testing trials. The software uses density to estimate body fat. Divide your weight by your volume and you’ve got your density. Subtract these two numbers and you’ve got your body volume. These values will give you the volume of the empty Bod Pod and the volume of the pod with you inside. Next, step into the chamber and let the machine measure the air pressure with you in it. Then, you measure the air pressure of the Bod Pod without you in it. First, you step on an electronic scale outside of the device which measures your weight. The Bod Pod is an egg shaped device that measures body volume and body weight to determine body density and body fat. “We consider the costs of UWW greater than the value,” says Weil. The tank must be emptied and cleaned after each weighing, thus it takes longer to perform several tests in a day compared to a Bod Pod. Some people might feel uncomfortable exhaling all of the air from their lungs while underwater, although it is performed in shallow water. HW was formerly the most trusted body composition testing method up until the Bod Pod came into play. Fat floats and that’s the principle.” ProsĪccording to the NSCA Essentials of Personal Training, the standard of error in other methods of estimating body fat such as skin fold assessment, bioelectrical impedance, and anthropometric measures are established against HW and these methods may have more error than HW. “That value is plugged into an equation to estimate body fat. Ed., CDE and Director of the Weight Loss Program at Mt. “You sit on a special scale in the water, submerge your whole body including your head, exhale completely to decrease lung volume so the body floats as little as possible, and then the density of the body is measured,” says Richard Weil, M. Hydrostatic (or underwater) weighing is a form of estimating body fat percentage in which a person is completely submerged in a pool of water.
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