Ball S D
Department of Nutritional Sciences, University of Missouri-Columbia, Columbia, MO, USA.
Eur J Clin Nutr. 2005 Sep;59(9):996-1001. doi: 10.1038/sj.ejcn.1602202.
To evaluate interdevice reliability in body density (Db) and percent body fat (%BF) using air-displacement plethysmography, the BOD POD (BP) body composition system.
Duplicate body composition tests were performed in immediate succession on 50 adults (26 M, 24 F; 21-53 y) using two BP units located in the same body composition laboratory.
Mean Db and %BF between BP1 and BP2 did not differ significantly for men (DeltaDb = 0.0003+/-0.0008 g/ml, P = 0.632; Delta%BF = 0.1+/-1.3, P = 0.665), while for women, there were small but significant differences in Db and %BF between BP1 and BP2 (DeltaDb = 0.0018+/-0.0003 g/ml, P = 0.001; Delta%BF = 0.8+/-1.1, P = 0.001). The regression between %BF by BP1 and BP2 did not deviate significantly from the line of identity for both men and women (R2 = 0.95, standard error of estimate (s.e.e.) = 1.23 %BF for men; R2 = 0.97, s.e.e = 1.13 %BF for women). Individual variations in %BF estimates between the two BP units were within acceptable ranges (95% limits of agreement = -2.5-2.7 %BF for men; -1.4-3.0 %BF for women), and there was no trend in individual differences as %BF varied (r = -0.19, P = 0.359 for men; r = 0.09, P = 0.677 for women). Other subject characteristics, including age, body mass, height, and body mass index, did not significantly contribute to the differences in %BF estimates by the two BP units.
No clinically significant differences in Db and %BF estimates exist between the BP units, and the interdevice variability of the BP has minimal impact on %BF estimates. Further, test-to-test reliability between BP units appears to be as good as within one unit.
使用空气置换体积描记法（BOD POD，BP）人体成分系统评估不同设备在身体密度（Db）和体脂百分比（%BF）方面的可靠性。
在同一人体成分实验室中，使用两台BP设备对50名成年人（26名男性，24名女性；年龄21 - 53岁）连续立即进行重复的人体成分测试。
对于男性，BP1和BP2之间的平均Db和%BF无显著差异（ΔDb = 0.0003±0.0008 g/ml，P = 0.632；Δ%BF = 0.1±1.3，P = 0.665），而对于女性，BP1和BP2之间的Db和%BF存在小但显著的差异（ΔDb = 0.0018±0.0003 g/ml，P = 0.001；Δ%BF = 0.8±1.1，P = 0.001）。BP1和BP2测得的%BF之间的回归对于男性和女性均未显著偏离恒等线（男性R2 = 0.95，估计标准误（s.e.e.）= 1.23%BF；女性R2 = 0.97，s.e.e = 1.13%BF）。两个BP设备之间%BF估计值的个体差异在可接受范围内（男性95%一致性界限 = -2.5 - 2.7%BF；女性 -1.4 - 3.0%BF），并且随着%BF变化，个体差异无趋势（男性r = -0.19，P = 0.359；女性r = 0.09，P = 0.677）。其他受试者特征，包括年龄、体重、身高和体重指数，对两个BP设备%BF估计值的差异无显著影响。
BP设备之间在Db和%BF估计值方面不存在临床上显著的差异，并且BP设备间的变异性对%BF估计值的影响最小。此外，BP设备之间的测试 - 测试可靠性似乎与同一设备内的可靠性一样好。
