Kinematic comparison of the seoi-nage judo technique between elite and college athletes |
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| Authors: | Takanori Ishii Michiyoshi Ae Yuta Suzuki Yasuto Kobayashi |
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| Institution: | 1. Physical Education, Health and Sport Sciences, University of Tsukuba, Tsukuba, Japan;2. Department of Physical Education, Nippon Sport Science University, Tokyo, Japan;3. Research Center for Urban Health and Sports, Osaka City University, Osaka, Japan;4. Department of Physical Therapy, Ibaraki Prefectural University of Health Science, Ibaraki, Japan |
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| Abstract: | This study sought to identify biomechanical factors that determine fast and skilful execution of the seoi-nage (shoulder throw) technique by comparing kinematics between elite and college judo athletes. Three-dimensional motion data were captured using a VICON-MX system with 18 cameras operating at 250 Hz as three male elite and seven male college judo athletes performed seoi-nage. No significant difference was found in motion phase time of the turning phase between the two groups, indicating that motion phase time is not necessarily a factor contributing quickness in seoi-nage. The maximum relative velocity of the whole body centre of mass along the anterior–posterior direction was significantly greater in the elite athletes (2.74 ± 0.33 m/s) than in the college athletes (1.62 ± 0.47 m/s) during the turning phase (p = 0.023). The overall angular velocity of the body part lines, particularly the arm line, tended to be greater in the elite athletes (p = 0.068). The results imply that the velocity of the thrower relative to the opponent in the forward drive and turning motion reflects high skill seoi-nage. Coaches should recognise the relative forward velocity as a factor that may contribute to a successful seoi-nage when teaching the judo throw technique. |
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| Keywords: | Three-dimensional motion analysis martial arts judo throwing technique nage-waza |
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