Effect of physical growth, exercise habits and lifestyles on bone condition for the period of growth and development

我们用骨声传导试验检查了日本儿童和青少年的骨状况。至于骨骼状况，已经清楚地表明，不同性别、年龄和运动经验的受试者在生长发育阶段存在差异。骨声传导试验表明，人的骨骼状况在11至16岁之间发展迅速。14岁以后，男孩和女孩之间的骨骼状况会有很大的不同。16岁以后，男生峰值频率稳定在130-133赫兹，女生峰值频率稳定在120-123赫兹，运动组峰值频率高于非运动组。持续的运动可以有效地改善学龄儿童的骨骼状况。男孩的每一条百分位数曲线都明显有随着年龄的增长而上升的趋势。女孩的曲线没有变化，除了97%的ILE曲线，这与男孩的模式一样有所改善。

We have examined the bone condition of Japanese children and adolescents using the sound transmission test of bone. As for bone condition, it has become clear that there is a difference resulting from sex, age and exercise experience in subjects in growth and development stage. The sound transmission test of bone has revealed that the bone condition rapidly develops when a person is between 11 and 16 years old. Bone conditions become remarkably different from each other between boys and girls after they are 14 years old. After subjects are 16 years old, the peak frequency becomes stable at the means of 130-133 Hz among boys, and 120-123 Hz among girls.The exercise group shows a higher peak frequency than the nonexercise group does. A continuous exercise can be effective to improve the bone condition of school-age children.Every percentile curves of boys clearly tend to rise with increasing age. Those of girls do not change except for 97%ile curve, which improves like the boy's pattern.