Does multifrequency bioelectrical impedance relate to body composition?
Suzuki H; Rounds JD; Wilmore DW Department of Surgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA. BACKGROUND: There is need for a rapid, noninvasive, inexpensive yet accurate bedside technique to measure body composition. Bioelectrical impedance analysis measures the resistance and conductance of a weak electrical current passed through the body. It has been suggested that multifrequency impedance analysis can determine the distribution of fluid between the extracellular and intracellular compartments. MATERIALS AND METHODS: The correlation between the resistance signals obtained from multifrequency bioelectrical impedance measurements and body composition was determined in normal rats ranging from 150 to 400 g in weight. Total body water, body fat, total body sodium, and total body potassium were measured using the carcass analysis technique, and extracellular water was derived from a dilutional marker using sodium bromide. Fat-free mass wa
