| Co-Investigator(Kenkyū-buntansha) |
KOUZAKI Motoki The University of Tokyo, Life Sciences, Assistant, 大学院総合文化研究科, 助手 (30313167)
KUBO Keitaro The University of Tokyo, Life Sciences, Assistant, 大学院総合文化研究科, 助手 (70323459)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2005: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2004: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Research Abstract |
The present research project aimed to investigate the morphological and functional profiles of muscle-tendon complex in growth stage. The main contents and findings obtained of the present research were the following. 1. The muscular architecture of the medial gastrocnemius muscle (MG) and Achilles tendon length were determined using a three dimensional ultrasonography in junior high school and high school boys. As the results, the average values in the thickness and fascicle pennation angle of MG for the boys were lower than those for young adult men. However, the ratio of the Achilles tendon length to the MG length was similar between the two age groups. In addition, the length values of the Achilles tendon and MG were significantly correlated to the lower leg length. However, the pennation angle of MG was not correlated to the measured morphological parameters of the lower leg. 2. The muscle architecture of limbs were determined using a two dimensional ultrasonography in junior athl
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etes of both genders. As the results, the muscle thickness, fascicle pennation angles and fascicle length were greater in the boys than in the girls. Muscle thickness and limb length were not significantly correlated to the pennation angle and fascicle length. From this result, it might be assumed that the differences in morphological parameters between the boys and girls cannot be a factor explaining the differences in muscle architecture. Moreover, the boys could develop grater torque than the girls. However, the ratio of torque to muscle volume index was similar between the boys and girls, regardless of the locations of muscle groups and the differences in muscle architecture. This result indicated that the gender-related difference in muscle strength capability might be attributed to the difference in muscle size rather than muscle architecture. 3. How the length of the Achilles tendon can be related to sport performances was examined in junior athletes of both genders. The length of the Achilles tendon, determined using a two dimensional ultrasonography, was significantly longer in the boys than in the girls. However, the gender-related difference was not significant when the length of the Achilles tendon was expressed as the value relative to the lower leg length. The length of the Achilles tendon was not significantly related to the performance score of vertical jump, side steps, 50m sprint run, standing broad jump and five consecutive jumps from standing position. However, the subjects with longer Achilles tendon tended to show higher scores in five consecutive jumps from standing position. Less
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