BIVA Tracker

Unleashing the power of bioimpedance

What is Bioelectric Impedance Analysis?

Bioelectrical impedance analysis (BIA) is a method for estimating body composition, in particular body fat and muscle mass, where a weak electric current flows through the body and the voltage is measured in order to calculate impedance (resistance and reactance) of the body. Most body water is stored in muscle. Therefore, if a person is more muscular there is a high chance that the person will also have more body water, which leads to lower impedance. Since the advent of the first commercially available devices in the mid-1980s the method has become popular owing to its ease of use and portability of the equipment. It is familiar in the consumer market as a simple instrument for estimating body fat. BIA^[1] actually determines the electrical impedance, or opposition to the flow of an electric current through body tissues which can then be used to estimate total body water (TBW), which can be used to estimate fat-free body mass and, by difference with body weight, body fat.

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Analysing with BIVA software

BIVA software is used to analyze impedance information gathered from a device such as the RJL Quantum Analyser. The software uses the values of resistance and reactance to determine a persons body composition and compares it to the normal composition values for a person of their age and gender.