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In other words, as pressure goes up, volume heatzone goes down, and vice versa . Monitoring pressure changes in heatzone a closed chamber allows one to calculate volume. Learn more about how the BodPod works! Visit the CNRC BodyComp web site. Bioelectrical impedance analysis (BIA) The resistance to an applied electric current flowing through the body is related to the volumes of conductive tissues that the current passes through. This measurement can estimate water and fat ratios. Bioelectrical impedance analysis is based on the conductive and non-conductive properties of various biological heatzone tissues. Most of the body's fat-free mass is composed of conductive tissues such as muscle, while fat is part of the non-conductive tissue mass. The volume of these tissues can be estimated from the measurement of the resistance to an applied electric current flowing through the body. Water is a constant fraction of fat-free mass, usually about 73 percent. The water measurement can therefore be used to estimate levels of fat-free mass.
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