Development of System for Estimation of Total Body Water (TBW), Fat Mass (FM), Fat Free Mass (FFM) using Bioimpedance Analysis Technique

Bioelectrical Impedance Analysis (BIA) is widely used tool for Body Composition Analysis in medical electronics and biomedical Engineering. The Body impedance also termed as Bioelectrical Impedance or Bioimpedance. It plays important role in various applications such as nutritional assessment, weight management and clinical research. The system presented in this paper is developed for Bioimpedance analysis from which the physiological body parameters such as Total Body Water (TBW), Fat Mass (FM) and Fat Free Mass (FFM) can be estimated. The proposed system consists of sine wave frequency synthesizer designed using table based method. It is followed by VCCS unit designed using TL071 operational amplifiers. This signal is passed through body with source electrodes and due to impedance of body voltage across the body is taken by sensing electrodes. The phase angle and differential gain is determined by phase gain detector followed by microcontroller based display and monitoring system.