| Project/Area Number |
14570330
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Public health/Health science
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| Research Institution | Kyoto University of Education |
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Principal Investigator |
NAKA Hiroshi Kyoto University of Education, Faculty of Education, Associate Professor, 教育学部, 助教授 (00217639)
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| Co-Investigator(Kenkyū-buntansha) |
IKI Masayuki Kinki University School of Medicine, Department of Medicine, Professor, 医学部, 教授 (50184388)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2003: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2002: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Bone mineral density / Lumbar spine / Hip / Japanese adolescents / Puberty / Body size / Life style / Follow-up study / 思春期 / 高校生 / 骨量増加決定要因 / 骨粗鬆症予防 / 中学生 |
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| Research Abstract |
For 412 first year students from 3 junior high schools and 316 first year high school students in Kyoto, we measured BMD by DXA at the lumbar spine (L2-L4) [LS] and total hip [TH], height, weight, and grip strength at baseline. We examined the same variables in 346 of the junior high school. students (127 boys and 219 girls, follow-up rate=84.0%) and 160 of the high school students (77 boys and 83 girls, follow-up rate=50.6%) again after 2 years respectively.
1.There was a significant increase in BMD at the LS (junior high school students: boys=10.4%/yr, girls=6.0%/yr; high school students: boys=4.2%/yr, girls=1.4%/yr) and TH (junior high school students: boys=8.6%/yr, girls=5.3%/yr; high school students boys=4.1%/yr girls=2.7%/yr) in both genders; and the gender differences in the rate of change in BMD at both grades and sites were observed. Since third-year junior high school students tend to increase BMD more than third-year high school students, the junior high school years are very important for bone mass gain. 2.BMD at LS and TH increased with maturity in both genders for junior high school students but not high school students. However, the annual change rates in BMD decreased with progression of puberty. 3.BMD at the spine and hip increased with weight in both sexes for both age groups. 4.Boys and girls with more active lifestyles in junior high and high school showed greater BMD and change rates at LS and TH. Physical activity for both age groups was inferred to positively influence bone development in adolescents. 5.Sufficient calcium intake in the junior high and high school years was considered to influence acquisition of bone density positively; although there was no significant relationship between BMD and calcium intake.
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