Bioimpedancia

Bioimpedancia, also known as bioelectrical impedance analysis (BIA), is a method used to estimate body composition. It works by passing a weak, harmless electrical current through the body and measuring the resistance to that current. Different tissues in the body have varying electrical conductivity. Fat tissue, for example, contains little water and offers more resistance to the electrical current than lean tissue, which is rich in water and electrolytes.

By measuring the impedance (resistance) and using established equations that incorporate factors like height, weight, age, and sex, BIA devices can estimate various body composition components. These commonly include total body water, fat-free mass (which includes muscle, bone, and organs), body fat percentage, and sometimes bone mineral content and basal metabolic rate.

BIA is a non-invasive and relatively inexpensive technique, making it accessible for use in clinical settings, fitness centers, and even for home use. While it provides a quick and convenient way to assess body composition, its accuracy can be influenced by several factors, including hydration levels, recent food intake, exercise, and the specific BIA device used. Therefore, results should be interpreted with an understanding of these potential limitations. Despite these factors, BIA is a valuable tool for tracking changes in body composition over time and for general health assessments.