To begin to understand the concept of bioimpedance (BIA), the differences in systems are outlined.   Most exercise physiology and nutrition textbooks lump all BIA systems together without differentiating their equations or their use in health care but only as a measure of body fat.

There are two ways that bioimpedance information is used in Canada.  Two numbers (resistance and reactance) are obtained from a small device.  They are then entered into equations along with height, weight, sex and age.  These equations have been developed and researched since the early 1980’s.   Of the two systems on the market that are now easy to acquire, one is far more advanced and the RD is the ideal professional to interpret results, apply nutrition intervention and monitor results (Clinical Nutrition BIA)  in practice.

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