Derived equation of bioelectrical impedance analysis validated by dual X-ray absorptiometry in assessing body composition of healthy Chinese adults

C. J. Peng, W. J. Yao, S. E. Kuo, H. C. Kuo, Y. J. Liu, P. C. Su, C. Y. Huang

Research output: Contribution to journalArticlepeer-review

Abstract

To derive more appropriate equations for measurement of percent body fat (%BF) by bioelectrical impedance analysis (BIA) on healthy Chinese adults, dual energy X-ray absorptiometry (DEXA) was used to validate BIA. A total of 193 healthy subjects, including 112 female (17-71 year-old) and 81 male (16-84 year-old) were included. Weight, height, %BF estimated by BIA (BIA-FAT) and DEXA (DEXA-FAT) were measured. Average of body mass index (BMI) for the male group was 23.42 ± 2.94 kg/m2, and 22.8 ± 3.22 kg/m2 for the female group. BIA-FAT and DEXA-FAT showed high correlation (for male r = 0.6466, for female r = 0.8548). Mean BIA-FAT were 23.12 ± 6.01% for male, and 30.78 ± 3.56% for female: while mean DEXA-FAT were 20.79 ± 6.72%, 33.25 ± 6.62% for male and female respectively. For females, BIA underestimated %BF when the body fat was higher than 26.57%, while it underestimated when body fat was less than 26.57%. On the contrary, BIA overestimated body fat when it was higher than 14.7%, and underestimated %BF when body fat was lower than 14.7% for males. Stepwise regression was used to select variables for correction of equations. The derived model for female was: %BF = 12.6308 + 1.3022 x (BIA-FAT) - 0.1022 x (BIA-reactance) - 4.4331 x (height/weight) (r = 0.9154); and for male: %BF = -30.7007 + 1.4379 x (BMI) + 0.6472 x (BIA-FAT) - 0.1724 x (BIA-reactance) + 5.4979 X (height/weight) (r = 0.8919). Those derived equations could aid the accuracy of measurement of body composition when BIA is used on healthy Chinese adults.

Original languageEnglish
Pages (from-to)49-66
Number of pages18
JournalNutritional Sciences Journal
Volume21
Issue number1
Publication statusPublished - 1996

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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