Effect of Habitual Exercise on Bone Mineral Density of Pubescent.

本研究旨在阐明月经周期对青春期女运动员骨形成的影响。研究对象为13名女运动员（年龄13.4岁），对照组为10名女孩（年龄13.8岁）。研究人员利用从女孩身上收集的信息，连续3个月记录受试者的月经周期。每26-31天来一次月经的7名运动员被归类为月经正常。另外6名没有这样做的人被归类为月经不规律。对照组月经规律5例，月经不规律5例。在研究开始和第三年分别测量体重、脂肪比、非脂肪非骨矿物质含量比、骨矿物质含量（BMC）和大腿骨附近骨矿物质密度（BMD）。Eseragiol （E2）在月经开始后7天测定。结果如下：1)观察各组体重、脂肪比、非脂肪非BMC比、BMC的年变化情况，月经规律组体重明显增加。对照组的体重和脂肪比例也显著增加。2) 3年后，对照组的骨密度均低于月经规律组和月经不规律组，但差异不显著。3)观察大腿骨附近骨密度的年度变化，运动员的骨密度随着时间的推移趋于增加，而对照组的骨密度下降更为明显。4) E2与BMD无明显关系。

This study was conducted to clarify the effects of menstrual periods on bone formation in girl athletes during pubescent. The subjects were 13 girl athletes (aged13.4) and a control group consisting of 10 girls (aged 13.8). The menstrual cycles of the subjects were recorded for 3 months using information gathered from girls. The seven athletes who had menstrual periods every 26-31 days were classified as having regular menstrual periods. The other 6 who did not were classified as having irregular menstrual periods. In the control group, 5 girls had regular menstrual periods and 5 had irregular menstrual periods. Weight, fat ratio, non-fat non-bone mineral content ratio, bone mineral content (BMC) and the bone mineral density (BMD) near the thigh bone were measured at the beginning of the study and the third year. Eseragiol (E2) was measured 7 days after the beginning of menstrual periods. The results are as follows.1)Looking at yearly changes in weight, fat ratio, non-fat non-BMC ratio and BMC in each group, the weight of those with regular menstrual periods increased significantly. Significant increases in weight and fat ratio were also seen in the control group. 2)The BMD of the control group was relatively lower than that of both the regular menstrual period group and irregular menstrual group after three years, though the difference was not significant. 3)Looking at yearly changes in the BMD near the thigh bone, athletes tended to show increases over the years, while decreases were more prominent in the control group. 4)there was no apparent relation between E2 and BMD.