Reference Data of Multi Frequencies Bioelectric Impedance Method in Japanese

Abstract

Objective: A device of based on the multi frequencies impedance method, named the InBody720, was developed for the purpose of estimating body composition. Methods: The performance, reliability and validity of this system were evaluated in Japanese subjects. Results: The coefficient variation (CV: %) in same-day tests was 1.96 (body fat percentage: %), 0.62 (muscle mass: kg), 0.63 (lean body mass: kg) and 1.09 (bone mineral content: kg), in three separate-day tests it was 3.59 (body fat percentage), 1.07 (muscle mass), 1.06 (lean body mass: kg) and 1.22 (bone mineral content: kg). There was a clear correlation between the results from InBody720 and those from dual energy X-ray absorptiometry (DEXA) (body fat percentage: r=0.788, p=0.0005, muscle mass: r=0.983, p<0.0001, lean body mass: r=0.984, p<0.0001, bone mineral content: r=0.759, p=0.0010). Conclusion: The findings indicate that this device is a highly reliable and valid method for determining body composition. This method has several advantages e.g. it is quick, simple to operate and may accommodate wide population. Abstract large inter-individual differences because of susceptibility to water distribution was encountered. Recently, an eight-point tactile-electrode impedance-meter (multi frequencies bioelectric impedance method) was developed and made available in Korea (InBody720, Biospace, Seoul, Korea). The aim of this study was firstly to evaluate the reliability and validity of this method for the determination of Japanese body composition, and this reference data will be helpful for future assessment of age-related changes in Japanese body composition and anti-aging medicine.