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As a result, these equations must try to estimate total bodyfat cardiosport based on measurements cardiosport of surface fat alone. That gets complicated as you get older, when you cardiosport tend to carry a greater proportion of your total fat deep within muscle and other tissues. As a result, a 25 mm skinfold sum (using the SlimGuide or Body Caliper method) can mean 16.8% total bodyfat if a woman is in her 20s, or it can mean 22.2% total bodyfat if she's in her 40s. To avoid underestimating total bodyfat in older women, use a skinfold equation that takes age into account. 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 methods, BIA is "rigged" in that it uses low-tech input provided by you to make the electrical part seem more accurate than it is.
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