| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1990: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1989: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1988: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Research Abstract |
In children (N=5) who were determined to be physically less active and in those (N=5) determined to be more active than usual children, the electromyographic (EMG) activity of the back and thigh muscles were investigated during back extension at different force levels (isometric task ; 10, 20, 30, 40, 50, 60 kg), and pedaling a bicycle ergometer at different load levels (continuous dynamic task ; 150, 300, 450, 600, 750, 900 kpm/min). Muscles studied were the trapezius m., latisimus dorsi m., erector spinae m., rectus femoris m., biceps femoris m., and gluteus maximus m. EMG data were full-ware rectified and integrated (IEMG) for selected intervals (back extension : 3 sec. ; bicycle pedaling : 5 revolutions) in each of the work load tasks. Main results were as follows :
(1) No difference was found in the physique between the inactive and active children. But, there was a significant difference in back extension strength, grip strength, leg extension strength, 50 meter dash time, standin
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g broad jump, and softball throw distance between these two groups. The inactive children were inferior in all of these test results than the active children.
(2) In the back extension task, there was a significant difference in the mIEMG (mean IEMG) of the erector spinae m. Between the two groups when they were at 9-10 years of age. The inactive children had a smaller mIEMG value than the active children. The mIEMG of the trapezius m. in the Inactive children was larger than in the active children at all load levels (10 - 40kg), but the difference was not statistically significant. In the results on the same children a year later (thus they were 10-11 years old), there was a significant difference in the mIEMG value of the erector spinae m. Between 10 and 50 kg. Results for the inactive children were smaller than those for the active children. No inactive-active group difference was revealed in other mIEMG data.
(3) In the bicycle pedaling task, when the children were 9-10 years old, no difference between the two groups of children was found at 150, 300, and 450 kpm/min load levels for all muscles examined. Some differences were revealed in the trapezius m. And the erector spinae m. When they pedalled at 600 kpm/min. A larger mIEMG in the trapezius m. And a smaller mIEMG in the erector spinae m. Were found for the inactive children compared to the active children though these differences were statistically insignificant. There was a significant difference in the mIEMG of the erector spinae m. Between the inactive and active children during pedaling at 450 and 600 kpm/min when their ages became 10-11 years. The value for the inactive children was smaller than the active children.
(4) In both back extension task and bicycle pedaling task, there was an incremental increase of difference between the inactive and active children as the work load increased. Less
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