A longitudinal study on the development of calcaneus bone strength:a case of one male subject observed from the 1st grade of elementary school to the 2nd grade of university
踵骨骨強度の発育状態に対する縦断的観察:小学校1年生から大学2年生までを観察した男子一例について

Ryosuke Okano
2015 Japan Journal of Human Growth and Development Research  
Height, weight and calcaneus bone strength of one male subject was measured every 2 months from the 1st grade of elementary school to the 3rd grade of high school. After that they were measured in September in the 1st grade of university, in July and December in the 2nd grade of university. The longitudinal data was compared to the cross-sectional datum of 806 population from the 1st grade of elementary school to the 2nd grade of university. The developmental pattern of one male subject' s
more » ... ale subject' s calcaneus bone strength from the 1st grade of elementary school to the 3rd grade of high school showed not gradual increment state but non linear state which revealed significant cubic regression curve. The month-elapsed development pattern of calcaneus bone strength during this period seemed to be not so steady as one of height or weight, rather showed huge unevenness. Consequently, it was inferred that each developmental relationship of calcaneus bone strength with height and weight was poorer than one of height with weight due to this unevenness. As a result of the continuation of Internet Addiction Disorder-like life since the entrance of university, his calcaneus bone strength decreased remarkably, and showed very lower value than the cross-sectional datum of the same age. From this fact, it is suggested that the living condition for the health of the bone since the entrance of university must be managed with a considerable carefulness.
doi:10.5332/hatsuhatsu.2015.66_63 fatcat:cxhpwroc2zhqbfksowtqc4tybq