不同钙摄入量控制下的青春期女孩骨骼钙保留的种族差异。
Racial differences in skeletal calcium retention in adolescent girls with varied controlled calcium intakes.
作者信息
Braun Michelle, Palacios Cristina, Wigertz Karin, Jackman Lisa A, Bryant Rebecca J, McCabe Linda D, Martin Berdine R, McCabe George P, Peacock Munro, Weaver Connie M
机构信息
Department of Foods and Nutrition, Purdue University, West Lafayette, IN 47907, USA.
出版信息
Am J Clin Nutr. 2007 Jun;85(6):1657-63. doi: 10.1093/ajcn/85.6.1657.
BACKGROUND
Higher bone mass in blacks than in whites has been related to greater calcium utilization efficiency. Dietary calcium requirements for maximal skeletal calcium accretion during puberty may differ between the races.
OBJECTIVE
This study compared the relation between calcium intake and calcium retention in black and white adolescent girls.
DESIGN
A range of controlled calcium intakes (760-1981 mg Ca/d) were used in 3-wk controlled balance studies. Some subjects were studied more than once; a total of 182 observations from 55 black girls and 66 white girls were analyzed.
RESULTS
Blacks had 185 +/- 32 mg/d greater mean skeletal calcium retention than did whites (P < 0.0001) at all calcium intakes as a result of significantly greater net calcium absorption (P < 0.001) and lower calcium excretion (P < 0.0001).
CONCLUSIONS
Dietary calcium requirements did not differ with race. Higher calcium retention at all calcium intakes during adolescence may underlie the higher bone mineral content of adult blacks than of adult whites.
背景
黑人比白人有更高的骨量，这与更高的钙利用效率有关。青春期期间骨骼钙最大蓄积量的膳食钙需求在不同种族间可能存在差异。
目的
本研究比较了黑人和白人青春期女孩钙摄入量与钙潴留之间的关系。
设计
在为期3周的对照平衡研究中采用了一系列可控的钙摄入量（760 - 1981毫克钙/天）。一些受试者被研究不止一次；共分析了来自55名黑人女孩和66名白人女孩的182项观察结果。
结果
在所有钙摄入量水平下，黑人的平均骨骼钙潴留比白人高185±32毫克/天（P < 0.0001），这是由于净钙吸收显著更高（P < 0.001）且钙排泄更低（P < 0.0001）。
结论
膳食钙需求不存在种族差异。青春期所有钙摄入量下更高的钙潴留可能是成年黑人比成年白人骨矿物质含量更高的基础。
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