The Diet of Women\u27s College Students (Part 9) : Yearly change of the Bone Mineral Density and Examination of the Life Style

"This study aims at examining the relationship between bone mineral density (BMD) and the life style of junior college students from the viewpoint of osteoporosis prevention with the advent of the aging society, and at the same time aims at finding the direction to follow in the nutrition education which is part of the health education. As for bone density measurement of metacarpus and calcaneum division, my previous reports showed that the caution group whose bone density was low accounted for more than 10%. Such a tendency manifested in the juvenile is very alarming, especially when frequent fracture and lifestyle related disease are often observed during the period of growth. In this research, how and why the bone density changes over the period of one year were examined. The result is shown below : 1. BMD mean value of the subjects was 2.5±0.20 (ΣGS/D) for the 1st year students, and 2.6±0.20 (ΣGS/D) for those of the 2nd year. This value is almost equal to the reference value of the 20-year-old girls. 2. The change of the bone density over the period of one year was +0.07 (ΣGS/D). Group A denoting minus change of the bone density accounted of 20.8% of all the subjects, group B denoting ±0 change 5.5%, group C denoting more than 0.09 point 56.4%, and group D denoting less than 0.1 point 17.3%. The investigation suggests that the bone density has increased in two-thirds of the whole subjects. 3. The mean value of the BMI, 21.0±2.02 was within the normal-range. The subjects whose BMI was less than 20 (including 20) occupied 36%. The minimum value of the BMI was 17.1,and the maximum one was 31.3. There was a wide distribution ranging from the slimness to the obesity. ""Slimness"" was distinct in the group whose BMD was low. 4. The fill-rate of the calcium was 117% in group A. Those of the other three groups, on the other hand, were all as low as 70% level. 5. As for the relation between the frequency of milk intake and bone density, the significant difference was not recognized. 6. The results of the multiple regression analysis in which the bone density was used as an explanatory variable showed that the maximum oxygen in-take and the number of steps were in the positive partial correlation coefficient.