中学生の身体特性および踵骨骨量の1年間の変化

概要

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Objective: The purpose of this study was to investigate the effect of pubertal maturation stage on development bone mass and body composition.Subjects and methods: Healthy 149 Japanese junior high school students (75 boys and 74 girls) were participated in the study. We measured transmission index (TI) and speed of sound (SOS) at the calcaneus using a quantitative ultrasound AOS-100 instrument (ALOKA Co., Ltd, Tokyo), height, weight and percentage of body fat by the bio-impedance method using TBF-300 (TANITA Co., Ltd, Tokyo). Five measurements were performed every three months for a year. Girls reported the age at menarche by the questionnaire.Results: The girls before menarche achieved higher increase in height, meanwhile those over one year after menarche did not achieve any increase. In both boys and girls, it was speculated that the degree of increase in height indicated the stage of pubertal maturation. So we divided the subjects into three groups of pubertal maturation by the degree of increase in height and performed statistical analyses of TI and SOS between three groups. In boys, less SOS value was obtained in the subjects at later stage of pubertal maturation while increases in TI were not statistically different between three groups. All three groups of girls showed the same degree of increase in SOS but no significant increase in TI.
日本発育発達学会の論文