| Project/Area Number |
19500493
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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 |
Physical education
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KANEHISA Hiroaki The University of Tokyo, 大学院・総合文化研究科, 教授 (50161188)
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| Co-Investigator(Kenkyū-buntansha) |
KUBO Keitaro 東京大学, 大学院・総合文化研究科, 助教 (70323459)
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2007: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 幼児 / 小学生児童 / 身体活動量 / 身体活動水準 / 筋量 / 筋機能 / 運動能力 / 性差 / 幼児期 / 身体組成 / エネルギー消費量 / 加速度計 / ステップワイズ法 / 発育期 / 筋力 / 横断的研究 / 縦断的研究 / 日常生活中の歩行数 / 年齢変化 / 筋形状 / 筋間差 |
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| Research Abstract |
The present study aimed to investigate the influences of age and sex on the muscle size and function and motor fitness in preschool and school children, and to clarify how the amount and intensity of daily activities become factors explaining the individual differences in muscular development and motor fitness. As one of the major findings of the present study, three were no significant differences between boys and girls in muscle thickness, muscle strength and their age-related changes in preschool and school ages, but boys showed better motor performances than girls even in preschool age. A regression analysis showed that factors selected for predicting motor performances differed between boys and girls, which might be assumed to be involved as a reason for the sex-related differences in motor performances. Muscle size was more closely related to the natural growth of the whole body rather than the amount and intensity of daily activities. On the other hand, fat mass for preschool children was negatively related to the mean intensity of daily activities, suggesting that the intensity of daily activities will be a determinant factor for the magnitude of fatness in preschool age. In addition, motor performances were related to the intensity but not to the amount of daily activities, and so frequent participation in physical activities with moderate to high intensity beyond the level of normal walking may be assumed to be a factor promoting development in muscle function in preschool and school children.
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