Evaluation of a new bio-impedance spectroscopy device in healthy Japanese

The use of a new bio-impedance spectroscopy device (Body Composition Monitor, BCM) in the field of dialysis became possible in Japan. However, it is unknown whether the data obtained using this apparatus are indicative for Japanese dialysis patients.

To compare individual fluid status in healthy Japanese using the BCM device with the data obtained from healthy Caucasians.

A total of 219 volunteers (female vs. male, 150 vs. 69; mean age, 68.8 ± 8.4 years; mean BMI, 22.6 ± 2.9 kg/m2) were enrolled. The measurement was performed by the end of the morning before exercise.

Mean over-hydration (OH) level was 0.7 ± 0.8 L. Nearly 80% of subjects had values equivalent to the standard values of healthy Caucasians (-1.1∼1.1 L). Age had a weak positive correlation to OH. The fat tissue index levels were slightly lower in Japanese than in Caucasians. On the other hand, the levels of lean tissue index and ECW/ICW (E/I) ratio did not differ between Japanese and Caucasians. E/I ratio showed a good correlation with OH level.

Fluid status of healthy Japanese was equivalent to the standard value of Caucasians. Although validity of using parameters from healthy Caucasians in healthy Japanese population was considered to be confirmed, validity of use in Japanese dialysis patients should be evaluated further using the parameters from healthy Caucasians.