Gerace Laura, Aliprantis Antonios, Russell Mary, Allison David B, Buhl Kathleen M, Wang Jack, Wang Zi-Mian, Pierson Richard N, Heymsfield Steven B
Department of Medicine, Obesity Research Center, St. Luke's-Roosevelt Hospital, Columbia University College of Physicians and Surgeons, New York, New York 10025.
Am J Hum Biol. 1994;6(2):255-262. doi: 10.1002/ajhb.1310060215.
Skeletal differences exist between closely matched Black and White women, although it is unknown if similar differences also exist between Black and White men after controlling for age, body weight, and stature. The aim of this study was twofold: to test the hypothesis that Black men have greater bone mass, higher bone mineral density, and longer limbs compared to White men of similar age, weight, and height; and second, to establish if ethnic variation in skeletal characteristics has an impact on the models upon which three widely used methods for estimating total body fat are based. Twenty-four healthy Black men were matched by age (±5 years), height (±3 cm), and weight (±2 kg) to 24 healthy White men. Skeletal characteristics and body composition were studied using anatomical and compartment estimates derived by anthropometry, H O dilution, hydrodensitometry, whole-body K counting, and dual photon systems. Black men had greater bone mineral mass (P = 0.007), higher bone density (P = 0.054), longer femurs (P = 0.002), longer anthropometric arm and thigh lengths (P = 0.001 and P = 0.002, respectively), lower spine to femur ratio (P = 0.004), and similar spine length (P = 0.271) compared to White men. Total body fat and fat-free body mass (FFM) were estimated in the men using a four-compartment model. Black and White men had similar total body fat, K (TBK), water (TBW), and FFM. Density of FFM and TBK/FFM were also similar between Black and White men, suggesting that current two-compartment hydrodensitometry and TBK models for estimating fat may not require adjustments for ethnicity. The TBW/FFM ratio, which is the main assumed steady-state relation for the two-compartment TBW method of estimating fat, was modestly increased (P = 0.05) in Black men (x̄ ± SD, 0.744 ± 0.018) compared to White men (0.732 ± 0.021). These results confirm that Black and White men differ significantly in some skeletal characteristics and these differences have implications in the study of both osteoporosis and human body composition. © 1994 Wiley-Liss, Inc.
在年龄、体重和身高相近的黑人女性和白人女性之间存在骨骼差异，不过在控制了年龄、体重和身高之后，黑人男性和白人男性之间是否也存在类似差异尚不清楚。本研究的目的有两个：一是检验这样一个假设，即与年龄、体重和身高相似的白人男性相比，黑人男性具有更大的骨量、更高的骨矿物质密度以及更长的四肢；二是确定骨骼特征的种族差异是否会对三种广泛使用的估计全身脂肪的方法所依据的模型产生影响。24名健康黑人男性在年龄（±5岁）、身高（±3厘米）和体重（±2千克）方面与24名健康白人男性进行了匹配。使用人体测量学、氘稀释法、水下密度测量法、全身钾计数法和双能光子系统得出的解剖学和分区估计值来研究骨骼特征和身体成分。与白人男性相比，黑人男性具有更大的骨矿物质质量（P = 0.007）、更高的骨密度（P = 0.054）、更长的股骨（P = 0.002）、更长的人体测量学上臂和大腿长度（分别为P = 0.001和P = 0.002）、更低的脊柱与股骨比例（P = 0.004）以及相似的脊柱长度（P = 0.271）。使用四分区模型对男性的全身脂肪和去脂体重（FFM）进行了估计。黑人男性和白人男性的全身脂肪、钾（TBK）、水（TBW）和FFM相似。黑人男性和白人男性之间FFM的密度以及TBK/FFM也相似，这表明目前用于估计脂肪的双分区水下密度测量法和TBK模型可能不需要根据种族进行调整。作为双分区TBW法估计脂肪的主要假定稳态关系的TBW/FFM比率，与白人男性（0.732±0.021）相比，黑人男性（x̄±SD，0.744±0.018）略有升高（P = 0.05）。这些结果证实，黑人男性和白人男性在一些骨骼特征上存在显著差异，并且这些差异在骨质疏松症和人体成分研究中都具有重要意义。© 1994威利 - 利斯公司。
