Reference Data of Multi Frequencies Bioelectric Impedance Method in Japanese

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.