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The level of tracer in the patient's urine communications after three communications hours reveals the total water volume. To find out a body's volume, subjects are weighed while totally submerged in water, and this is subtracted from their normal weight to give the weight of water displaced, and hence the subject's volume. But it is scarcely practical for seriously ill people. There are other ways to directly measure body fat, such as passing a minuscule current between the wrists and feet. The overall fat content can then be estimated from the body's resistance. communications But this method does not take body shape into account - so a subject with particularly skinny legs might register a higher fat content than the true value. That is because skinny legs - with a lower cross-sectional area - will present higher resistance to current. So the machine thinks the water content of the body is lower - rating the subject as fatter.
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