Shafer Kimberly J, Siders William A, Johnson LuAnn K, Lukaski Henry C
U.S. Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, North Dakota, USA.
Nutrition. 2008 Feb;24(2):148-54. doi: 10.1016/j.nut.2007.10.015. Epub 2007 Dec 19.
We determined the effect of clothing type on the validity of air-displacement plethysmography (ADP) to estimate percentage of body fat (%BF) and ascertain if these effects differ by body mass index (BMI).
The %BF by dual x-ray absorptiometry (DXA) and %BF, density, and body volume by ADP were assessed in 132 healthy adults classified by normal (N; 18.5-24.9 kg/m2), overweight (OW; 25-29.9 kg/m2), and obese (OB; 30-39.9 kg/m2) BMIs.
Compared with DXA, ADP underestimated (P < 0.0001) %BF from scrubs (SC) and t-shirt/shorts (TS) in N (11.4%; 8.6%) and OW (6.8%; 4.9%) BMI groups, respectively. ADP compared with DXA overestimated (P < 0.0006) %BF in the OW group (1.2%), but underestimated (P < 0.0001) it in the N group (2.4%). ADP also overestimated (P < 0.006) %BF in the OB group wearing spandex (SP; 4.8%), but not in those wearing SC (0.7%; P = 0.10) and TS (0.5%; P = 0.22) versus DXA.
All three clothing types showed significant error in estimating %BF with ADP compared with DXA in N and OW BMI. Use of spandex provided the least error and is the preferred attire to obtain valid body composition results when testing N and OW subjects. However, SP provided the greatest error in the OB group. Error in ADP %BF in OB was minimal in SC and TS and similar to the within-subject variability in %BF estimates with ADP. Thus, TS and SC are acceptable alternatives to SP in adults with excess body weight.
我们确定了服装类型对空气置换体积描记法（ADP）估计体脂百分比（%BF）有效性的影响，并确定这些影响是否因体重指数（BMI）而异。
对132名健康成年人进行评估，根据BMI分为正常（N；18.5 - 24.9 kg/m²）、超重（OW；25 - 29.9 kg/m²）和肥胖（OB；30 - 39.9 kg/m²）三组，通过双能X线吸收法（DXA）测量%BF，通过ADP测量%BF、密度和身体体积。
与DXA相比，在正常BMI组（N）中，ADP低估了穿着手术服（SC）和T恤/短裤（TS）时的%BF（分别为11.4%；8.6%），在超重BMI组（OW）中也分别低估了（6.8%；4.9%）（P < 0.0001）。与DXA相比，ADP在超重组（OW）高估了%BF（1.2%，P < 0.0006），但在正常组（N）中低估了（2.4%，P < 0.0001）。与DXA相比，ADP在穿着氨纶（SP）的肥胖组（OB）中也高估了%BF（4.8%，P < 0.006），但在穿着手术服（SC）（0.7%；P = 0.10）和T恤/短裤（TS）（0.5%；P = 0.22）的肥胖组中则没有高估。
与DXA相比，在正常和超重BMI组中，所有三种服装类型在使用ADP估计%BF时均显示出显著误差。穿着氨纶时误差最小，在测试正常和超重受试者时是获得有效身体成分结果的首选着装。然而，在肥胖组中氨纶产生的误差最大。肥胖组中穿着手术服和T恤/短裤时ADP测量%BF的误差最小，且与ADP测量%BF的受试者内变异性相似。因此，对于体重超标的成年人，T恤/短裤和手术服是氨纶的可接受替代选择。
