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Reference Models Measurements of body composition are based on theoretical body composition models. The more traditional methods are based on a two-component model that simply divides body fat measurement the body into fat and fat-free mass. Newer, more sophisticated techniques measure the body as multiple compartments consisting of water, protein, bone mineral, and fat. This approach improves the body fat measurement accuracy of the calculation for determining the real density of fat-free mass. There are two basic body-composition models: the two-compartment model--fat-free mass and fat; and the four-compartment model-- bone/mineral, protein, water, and fat. Equation Formulas The equations used body fat measurement in predicting body composition have been developed using regression models that take into account data from many different research projects. Known as regression equations, these can be population-specific (developed for specific types of people including such categories as gender, age, ethnicity, fitness level, etc.)
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