J BONE MINER RES:钙和两倍剂量的维生素D对老年人骨代谢的影响:一项随机对照试验

2017-03-12 MedSci MedSci原创

多大剂量的维生素D对优化老年人骨代谢最理想并不清楚。我们假设:维生素D在高于医学研究所(IOM)推荐的剂量对骨重建和骨量有益。

多大剂量的维生素D对优化老年人骨代谢最理想并不清楚。我们假设:维生素D在高于医学研究所(IOM)推荐的剂量对骨重建和骨量有益。

在双盲试验中,我们给予257名超重老人100 mg/天的柠檬酸钙和日当量的3,750 IU/天或600 IU/天的维生素D3一年。项目的平均年龄为71±4岁,体重指数为30±4kg/m2,55%为女性,222名老人完成了12个月的追踪随访。

血清平均25羟基维生素D(25OHD)浓度为20 ng/ml,低剂量组可上升到26 ng/ml,高剂量组在一年后可达到36 ng/ml(P<0.05)。在6或12个月,血清甲状旁腺素、骨钙素和C-端端肽(croos laps)表达水平在两组中均明显下调20-22%,但是在两组间没有显着性差异。而在12月时,高剂量组的血清骨化三醇浓度明显升高。一年后,两组骨矿物质密度(BMD)在髋骨和腰椎部显着增加,而不是在股骨颈。而身体其他部位的BMD仅在高剂量组明显增加。然而,在两组间没有任何骨骼位置的BMD百分率发生明显改变。项目中,血清25OHD浓度低于20 ng/ml和PTH高于76 pg/ml的所有骨骼表现出BMD明显增幅的趋势。在高剂量组,髋部的BMD增幅变化显着。相反的试验在两组间也进行了比较。

这项对照试验表明,对于超重的老年个体来讲,每天给药超过IOM建议的600 IU维生素D对BHD和骨标志物没有更多益处。

原始出处

Rahme M, Sharara SL, et al. Impact of Calcium and Two Doses of Vitamin D on Bone Metabolism in the Elderly: A Randomized Controlled Trial. J Bone Miner Res. 2017 Mar 9. doi: 10.1002/jbmr.3122.

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    2017-10-23 apoenzyme
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    2017-07-28 amyloid
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    2017-03-12 cqykthl

    多大剂量的维生素D对优化老年人骨代谢最理想

    0

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    2017-03-12 Albert Wu

    对于超重的老年个体来讲,每天给药超过IOM建议的600 IU维生素D对BHD和骨标志物没有更多益处。

    0

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