[Infant bone quantity measurement by the ultrasonic]

It seems that the maximum bone quantity in the young people will influence osteoporosis development in the later age. This study is to clarify the age-related change in the adolescence and the relations between bone density and exercise habit or diet habit, ultrasonic-measured bone density, physical capacity test and questionnaire survey were used. The values of SOS tended to increase along with the increase of age in both sexes when they were in the primary and middle school, but a decreased tendency was observed when they were in the high school. And the peak values were found in 17 - 18-year-old boys and 16-year-old girls. SOS correlated significantly with weight, and showed greater value in the exercise group compared with the sedentary group. And finally, the questionnaire survey showed that the regular diets were beneficial to increase SOS.