Relationship Between Bone Mineral Density and Related Factors in Puberty: a 4-year Longitudinal Survey

Abstract Bone fragility is a major factor in frail locomotive syndrome. For this fundamental measure, it is important to understand the changes in puberty, where bone metabolism is most active.The subjects were 277 boys and girls who participated in the Iwaki Health Promotion Project from 2011 to 2015 in both the fifth grade (10th/11th y.o) and the third grade of junior high school (14th/15th y.o). Bone mineral density and bone metabolism-related factors (physique and bone metabolism marker) during 4 years of puberty were examined. As for the physique at 10th/11th y.o, all factors were correlated with the bone density at 14th/15th y.o in boys and in girls, height, body muscle ratio, and grip strength value were correlated. In the 4-year rate of change, there was a positive correlation between height, body muscle rate, and bone mineral density in boys, but not in girls. For both boys and girls, a positive correlation was found between the physique (height, body muscle ratio, grip strength) in 10th/11th y.o, bone density at 14th/15th y.o, and bone metabolism markers.It is important to increase the peak bone mass: and prevent bone fragility by building a sufficient physique for boys (14th/15th y.o) and girls (10th/11th y.o).