Which method measures body composition using electrical currents?

Bioelectrical impedance is a method that estimates body composition by using electrical currents. The principle behind this technique is based on the fact that different tissues in the body conduct electricity at different rates; for example, lean tissue, which is rich in water and electrolytes, conducts electricity well, while fat tissue does not.

During the test, electrodes are placed on the skin, typically on the hands and feet, and a small, harmless electrical current is passed through the body. The resistance and reactance to the current are measured, which allows the estimation of body fat percentage and lean body mass. This method is convenient and non-invasive, making it accessible for both clinical and personal use.

In comparison to the other methods listed, bioelectrical impedance specifically utilizes electrical currents, differentiating it from techniques like dual X-ray absorptiometry, hydrostatic weighing, and skinfold measurement, which rely on other forms of measurement to assess body composition.