You’ve seen body-weight scales at stores, online, in gyms and at the doctor’s office that utilize bioimpedance analysis. These scales can be expensive and wondered what is bioimpedance analysis and is it worth the price?
Bioelectrical impedance analysis may sound complicated, however, BIA devices use today’s technology. It measures the rate at which low-level electrical current is run through the body. Based on the rate that it travels, algorithms are used to measure fat-free mass, along with other data, such as height, gender, and weight measurements to determine your body fat percentage.
Mathematical relationship between Resistance (R), Reactance (X), and Impedance (Z) are:
Z = sqrt (X2+R2)
X = Z * sin (α)
R = Z * cos (α)
phase angle = arcsin (X/Z)
phase angle = arctan (X/R)
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