DEXA vs. Bio-Electrical Impedance Scales: Which is Better for Measuring Body Fat?
Collectively, these scales all work on the same principle and have some features in common. They all run a small current through your body, from one of the points of contact (there will be metal pads that you either stand on or hold or both) and based on the amount of electricity which is impeded (stopped) by your body, it calculates your body fat percentage. Sounds great, right?
Unfortunately, as with many readily accessible methods of measuring body composition, when you dig into the research, issues start to arise.
What are BEI scales?
Bioelectrical impedance (BEI) scales work via a process called bioelectrical impedance analysis (BIA).
BIA measures the rate at which a low-level electrical current travels through the body. Since currents travel at varying speeds depending on the type of tissue they’re travelling through, BIA can be used to offer estimates of body composition.