Which measurement technique uses bioelectrical impedance?

Bioelectrical impedance analysis (BIA) is a specific technique that utilizes bioelectrical impedance to estimate body composition, particularly body fat percentage and lean mass. This method works by sending a small electrical current through the body and measuring the impedance (resistance) encountered. Different tissues in the body, such as fat and muscle, have different levels of conductivity; thus, the resistance measured can provide valuable data about the body's composition.

The underlying principle is that lean tissue, with its higher water content, conducts electricity better than fat tissue does. Consequently, BIA can offer insights into an individual's body fat, muscle mass, and overall hydration levels in a non-invasive manner. This makes it a popular choice for body composition analysis in both clinical and fitness settings.

While skinfold measurements, dual-energy X-ray absorptiometry, and body circumferences measurement are all valuable techniques for assessing body composition, they do not utilize bioelectrical impedance. Skinfold measurements rely on calipers to assess subcutaneous fat, dual-energy X-ray absorptiometry uses X-rays to differentiate between lean and fat mass, and body circumferences involve measuring specific areas to estimate body fat. Thus, bioelectrical impedance is uniquely associated with BIA.