西班牙裔成年人的去脂体重特征：与非西班牙裔白人和尸体参考值的比较。
Fat-free mass characteristics of Hispanic adults: Comparisons with non-Hispanic Caucasians and cadaver reference values.
机构信息
College of Nursing and Health Sciences, Texas A&M International University, Laredo, TX, USA.
Department of Kinesiology & Sport Management, Texas Tech University, Lubbock, TX, USA.
出版信息
Clin Nutr. 2020 Oct;39(10):3080-3085. doi: 10.1016/j.clnu.2020.01.013. Epub 2020 Jan 31.
BACKGROUND
A four-compartment (4C) model quantifies fat, water, mineral and residual. As such, 4C models are more accurate than two-compartment (2C) models based off cadaver reference values (RV), which necessitate assumptions regarding fat-free mass (FFM) characteristics. Nonetheless, research has yet to determine whether the FFM characteristics of Hispanics are similar to non-Hispanic Caucasians and RV.
AIM
The aim of this analysis was to compare the FFM characteristics of Hispanics to non-Hispanic Caucasians and cadaver RV.
METHODS
Data from 2 separate research centers were pooled to create a sample of 100 and 119 Hispanic males and females (age: 18-54 yrs; BMI: 16.46-42.27 kg/m), respectively, and 47 and 55 non-Hispanic Caucasian males and females (age: 18-54 yrs; BMI: 16.00-36.67 kg/m), respectively (n = 331). A 4C model was determined using bioimpedance analysis for hydration, dual energy X-ray absorptiometry for mineral, and air displacement plethysmography for body density (4C-ADP). FFM was calculated via the 4C-ADP and FFM characteristics (i.e., density [D], water [TBW:FFM], bone mineral [Mo:FFM], and residual [R:FFM]) were compared between sexes and ethnicities using a one-way ANOVA and against RV via a one sample t-test.
RESULTS
In Hispanics, all FFM characteristics significantly differed from cadaver RV (all p < 0.05). In contrast, D and TBW:FFM of non-Hispanic Caucasians were similar to cadaver RV for both sexes (all p > 0.05). Moreover, the R:FFM of non-Hispanic Caucasian females did not differ from cadaver RV (p = 0.403) whereas all other comparisons were significantly different (all p < 0.05). Sex comparisons within Hispanic participants revealed FFM characteristics were similar between males and females other than Mo:FFM (p < 0.001) whereas all FFM characteristics were similar between non-Hispanic Caucasian males and females (all p > 0.05). All of the ethnicity comparisons within males were statistically significant (all p < 0.05). Moreover, ethnicity comparisons within females were statistically significant for all comparisons other than Mo:FFM (p = 0.258).
CONCLUSION
The observed differences in FFM characteristics of Hispanics as compared to non-Hispanics Caucasians and reference values indicate that allied health professionals should employ appropriate caution when estimating body composition via 2C models in Hispanic populations.
背景
四室（4C）模型量化脂肪、水、矿物质和残余物。因此，4C 模型比基于尸体参考值（RV）的两室（2C）模型更准确，这需要对去脂体重（FFM）特征做出假设。尽管如此，研究尚未确定西班牙裔人的 FFM 特征是否与非西班牙裔白人和 RV 相似。
目的
本分析旨在比较西班牙裔与非西班牙裔白人和尸体 RV 的 FFM 特征。
方法
将来自 2 个不同研究中心的数据合并，创建了 100 名和 119 名西班牙裔男性和女性（年龄：18-54 岁；BMI：16.46-42.27 kg/m），以及 47 名和 55 名非西班牙裔白种男性和女性（年龄：18-54 岁；BMI：16.00-36.67 kg/m）的样本（n=331）。使用生物阻抗分析测定水合作用的 4C 模型，使用双能 X 射线吸收测定法测定矿物质，使用空气置换体描记法测定体密度（4C-ADP）。通过 4C-ADP 计算 FFM，并通过单向方差分析比较男女和种族之间的 FFM 特征（即密度[D]、水[TBW：FFM]、骨矿物质[Mo：FFM]和残余[R：FFM]），并通过单样本 t 检验与 RV 进行比较。
结果
在西班牙裔人群中，所有 FFM 特征均与尸体 RV 显著不同（均 p<0.05）。相比之下，非西班牙裔白种人的 D 和 TBW：FFM 与两性的尸体 RV 相似（均 p>0.05）。此外，非西班牙裔白种女性的 R：FFM 与尸体 RV 无差异（p=0.403），而其他所有比较均有显著差异（均 p<0.05）。在西班牙裔参与者中，男性和女性之间的 FFM 特征除 Mo：FFM 外，其他均相似（p<0.001），而非西班牙裔白种男性和女性之间的所有 FFM 特征均相似（均 p>0.05）。男性的所有种族比较均具有统计学意义（均 p<0.05）。此外，女性的所有种族比较除 Mo：FFM 外均具有统计学意义（p=0.258）。
结论
与非西班牙裔白人和参考值相比，西班牙裔人的 FFM 特征存在差异，这表明在西班牙裔人群中，通过 2C 模型估计身体成分时，医疗保健专业人员应格外小心。
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