The bioelectrical impedance analysis (BIA), which was first used in the late 1960s, is based on the principle that the human body is made of water with good electricity and the degree of electricity passing through it, Impedance index is obtained by flowing alternating current, and body water is measured.
Until the late 1980s, the BIA method had incorrect results with single-frequency system impedance measurements and had to be calibrated through empirical variables. However, the formulas to which the variables were added were less accurate than those of the group, making it difficult to use them universally.
In 1996, BIA’s inaccuracies were due to limitations of technology. Therefore, Inbody Co., Ltd. developed the commercial BIA body composition measuring instrument, Inbody, which realized the world’s first direct and multi-frequency measurement. At present, Inbody is acknowledged as a high precision and reproducible technology by world experts, and hundreds of related papers are listed in nutrition, sports, and obesity every year