2006 Fiscal Year Final Research Report Summary
A longitudinal study on the relationship between lifestyle habits and bone density, body fat, and physical fitness of students during adolescence
| Project/Area Number |
15500502
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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 |
Applied health science
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| Research Institution | Yonago National College of Technology |
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Principal Investigator |
MINAMI Masaki Yonago National College of Technology, General Education, Professor, 一般科目, 教授 (20342537)
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| Co-Investigator(Kenkyū-buntansha) |
IKEMOTO Yukio Yonago National College of Technology, General Education, Associate Professor, 一般科目, 准教授 (50202916)
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| Project Period (FY) |
2003 – 2006
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| Keywords | students during adolescence / bone density / body fat / physical fitness / lifestyle habits |
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| Research Abstract |
The objectives of this study are to continuously measure and research the lifestyle habits, bone density, body fat, and physical fitness of students during adolescence and discuss their age-related changes and the relationships between them, Last year, measurements and research were performed in the same manner as in the previous years and data was collected longitudinally. Additionally, 157 students of a higher professional school living in a regulated dormitory and 240 students on the track teams of 5 higher professional schools and 2 high schools in central Japan were measured and researched to discuss the effects of regular exercises on bone density and body fat.
1.The evaluated bone density of male students during adolescence tended to increase as their grade in school advanced. The evaluated bone density had a significant relationship with the students' physical strength and lifestyle habits, for example, their leg strength in standing broad jumps and repetitive sideways jumps, ea
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ting habits, and consumption of dairy products.
2.The body fat percentage of the adolescent male students tended to increase, starting from the fourth year. There was a significant relationship between their body fat percentage and frequency of exercise, sleeping hours, and regularity of meals. Therefore, it was supposed that these lifestyle factors affected the increase of body fat percentage. Only 1% of the students were extremely underweight during adolescence.
3.The results of the measurements and research of the dormitory students showed that the rate of change in evaluated bone density was higher in the lower grades and the rate of change decreased as their grade in school advanced. Students whose lifestyle habits were improved by guidance based on the results of measurements showed a higher rate of change in evaluated bone density.
4.The results of the measurements and research of the track and field athletes during adolescence showed that : long-distance runners had a lower body fat percentage than the other athletes. Compared to the average of the other students of the same age, throwing event athletes had a higher body fat percentage in the trunk and upper extremities and a higher evaluated bone density.
Currently, longitudinal data is being collected. The effects of the age-related changes, lifestyle habits before adolescence, and types of training on the changes in evaluated bone density and body fat percentage are now being researched. Less
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Research Products
(8 results)
