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目的：探讨日本中老年妇女前臂骨密度（ＢＭＤ）随增龄变化的特点及与其相关的某些因素。方法：使用美国Ｈｏｌｏｇｉｃ公司的ＤＴＸ１００型单能Ｘ线吸收仪（ＳＸＡ）测定前臂ＢＭＤ。体格及肌力测量包括身高、体重及握力。通过问卷获得有关日常身体活动及富含钙的食物摄入情况。结果：１７４名日本４０～７９岁健康妇女前臂ＢＭＤ平均值随年龄而递减，５０岁后骨损失加速。最高骨质累积丢失率为３５．２４％。多因素逐步回归分析显示在该人群中，年龄与前臂ＢＭＤ呈显著负相关。握力、日常规律性运动习惯与前臂ＢＭＤ呈显著正相关。而身高、体重及经常性含钙食物摄入习惯则与前臂ＢＭＤ关系不密切。结论：很多因素影响中老年妇女ＢＭＤ。对前臂ＢＭＤ，年龄、肌肉的强度和日常规律性运动是较重要的影响因素。因此，适当增加体育活动对防止中老年妇女骨质疏松骨折的发生具有积极意义
OBJECTIVE: To investigate the characteristics of changes in forearm bone mineral density (BMD) and its related factors in middle-aged and older women in Japan. METHODS: Forearm BMD was measured using a DTX100 single-energy X-ray absorptiometer (SXA) from Hologic, USA. Physical and muscle strength measurements included height, weight, and grip strength. Through questionnaires on daily physical activity and calcium-rich food intake. Results: The average forearm BMD of 174 Japanese healthy women aged 40-79 years decreased with age, and bone loss accelerated after age 50. The highest cumulative bone loss rate was 35.24%. Multivariate stepwise regression analysis showed that age was significantly negatively correlated with forearm BMD in this population. The grip strength and daily regular exercise habits were significantly positively correlated with forearm BMD. The height, weight, and regular intake habits of calcium-containing foods are not closely related to forearm BMD. Conclusion: Many factors affect BMD in middle-aged and elderly women. For forearm BMD, age, muscle strength, and daily regular exercise are more important influencing factors. Therefore, it is of positive significance to increase physical activity to prevent the occurrence of osteoporotic fractures in middle-aged and elderly women.