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You sit on a scale in a large tank of water and blow all the air out of your lungs, then submerge yourself in the water completely. You stay underwater for 5 seconds, while your underwater impedance weight is recorded. You have to make sure no air is trapped in your lungs, otherwise the test will be impedance inaccurate and your results will make you appear fatter. Infrared Interactance This technique involves a different coloured light, which is shone onto the skin surface at selected areas. The spectrum of the wavelengths impedance reflected is analysed by computer. The lean : fat ratio at the test areas can be calculated as fat and lean tissue have different interactive spectra. This method is not recommended because researchers have found prediction errors. How much body fat is healthy? Contact Us Free Trial Membership Newsletter Privacy Help Press Office Site Map click here>> Email this page Print this page Try It Free See the healthy weight range personal to you, set a weight loss goal, and see how many calories you need each day to get there - try the Weight Loss Resources tools free for 3 days.
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