大豆异黄酮减缓绝经后妇女骨丢失的临床效应

目的:确定大豆异黄酮减缓绝经后雌激素缺失状态下骨丢失的生理效应及其有效剂量。方法:以骨量正常或低减的绝经后妇女87人为研究对象,随机单盲分为大豆异黄酮84 mg/d和126 mg/d两个剂量组及安慰剂对照组,另以绝经后妇女10人给予7-炔诺酮2.5 mg/d作为阳性对照组,追踪24 w,测定腰椎、股骨颈和Ward,s三角区试验前后的骨密度值。结果:试验后安慰剂对照组腰椎骨密度较试验前显著下降(P<0.05), 大豆异黄酮两组及雌激素对照组各部位骨密度试验前后无显著变化 (P>0.05);协方差分析表明,试验后大豆异黄酮126 mg/d组、和雌激素对照组腰椎部位骨密度均值及其变化率显著高于安慰剂组(P<0.05),回归分析表明大豆异黄酮对各部位的骨密度变化率均有显著的正向作用(P<0.05)。结论:大豆异黄酮84～126 mg/d可减缓绝经后妇女骨的丢失,维持骨密度的相对稳定,其显效剂量是126 mg/d。

THE ATTENUATING EFFECT OF SOY ISOFLAVONES EXTRACT ON BONE LOSS IN POSTMENOPAUSAL WOMEN

Objective: To investigate the effect of soy isoflavones extract on bone loss induced by estrogen deficiency. Methods: 87 postmenopausal women were randomly assigned in single blind manner, to three treatment groups with daily intake of placebo, 84 mg and 126 mg soy isoflavones respectively. Additionally a positive control group was 10 women was given daily 2.5 mg estrogen. Bone mineral density (BMD) of the lumbar spine, neck of femur and Ward`s triangle were measured at baseline and post treatment after 24 wk . Results: BMD in all sites in both isoflavones treated and estrogen treated groups did not change significantly. However, the BMD of the lumbar spine decreased in the placebo group (P<0.05). A clear dose-response curve of isoflavones was established for BMDs in all sites. Results of ANCOVA showed that the BMDs and their change rates in 126mg/d isoflavones treated group and estrogen treated group were higher than the placebo group significantly(P<0.05). Conslusion: Isoflavones extract at daily dosages of 84mg to 126 mg may attenuate bone loss in postmenopausal women.