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Another consideration is measuring the amount of air left in a person's lungs. This should be measured find free article search at articlesfactory directly. If estimated according to find free article search at articlesfactory existing formulas, the body fat measurement is subject to a certain degree of error. New research shows that body density can vary because find free article search at articlesfactory of changes in hydration or the proportion of bone minerals from person to person. Work is under way to develop multi-component body models to replace the two-compartment model (fat and fat-free mass) on which underwater weighing is currently based. This could lead to more refined prediction equations. BIA Bioelectrical Impedance Body impedance is measured when a small, safe amount of current, is passed through the body, carried by water and fluids. The greater the amount of water in the person's body, the easier it is for the current to pass; the less water, the higher the resistance or impedance, By entering impedance measurements, along with a person's height, weight and gender into mathematical equations, it is possible to estimate the values of water, lean mass, and fat content, Lean body tissue (fat-free mass) is composed of 70-75% water, fat tissue only 10-15% water.
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