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Bioelectrical Impedance Analysis High-tech bathroom scales and handheld devices that use BIA run a tiny current through your body to estimate bodyfat. Because muscle conducts and fat insulates, electrical resistance is used to estimate bodyfat percentage. Unlike skinfold chelated methods, BIA chelated is "rigged" in that it uses low-tech input provided by you to make the electrical part seem more accurate than it is. Richard chelated Pierson Jr., MD, professor of clinical medicine at St. Luke's-Roosevelt Hospital, Columbia University, New York, states: "BIA measures allow for height, weight, gender, and sometimes activity level and age to be written into the equation. These by themselves give a pretty good estimate of fatness. The question then becomes, `What does the BIA add?' With everything except the BIA, the error for predicting fat is about plus or minus 13%.
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