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.
|Number of pages||18|
|Journal||Nutritional Sciences Journal|
|Publication status||Published - 1996|
All Science Journal Classification (ASJC) codes
- Medicine (miscellaneous)
- Nutrition and Dietetics