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Bioelectrical impedance analysis (BIA) measures the opposition of body cells and tissues to the flow of a radiofrequency alternating electric current. The voltage drop between electrodes provides a measure of impedance, which is low in lean tissue and high in fat tissue and bones. Impedance is the vector sum of the resistance or conductive characteristics of body tissues and the reactance or opposition due to the capacitance of cell membranes, tissue interfaces, and non-ionic substances.

References:
Ellis J, et. al. Bioelectrical impedance methods in clinical research: a follow-up to the NIH technology assessment conference. Nutrition, Volume 15, Nos. 11/12, 1999.
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