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Disadvantages: The results may be inaccurate for older people because fat tends to internalize with age, and readings may underestimate body fat content. dexa Try it: The Accu-Measure Fitness 3000 Personal Body Fat Tester manual calipers with body-fat chart, $15.99 at GNC stores, several Valley locations, visit www.gnc.com. Bioelectric impedance In this method, electrodes are placed on the skin or touched with bare skin and a small electrical current is passed among them. The opposition (impedance) to the flow is measured, and a built-in computer calculates body dexa fat percentage. The method is based on the fact that lean tissue dexa is more conductive due to its higher water content. Many fitness centers use this method. Advantages: It can be done at home with some devices, such as scales or hand-held calculators. Disadvantages: Bioelectric impedance is not recommended for people who have pacemakers. It's most accurate for "normal" weights and less accurate for very lean and obese people.
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