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Bioelectric impedance analysis (BIA)

The basic principle of BIA is LBM is proportional to the electrical conductivity of the body. A small electrical current is passed into the body, then the resistance or impedance , to that current is measured. Fat is a poor electrical conductor, containing little water, whereas, lean tissue contains mostly water and electrolytes and thus a good electrical conductor. Thus, BIA estimated total body water and uses assumptions about hydration levels and the exact water content of varies tissues.

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