剣道の運動生理学的研究その2 : 正面打撃動作と打撃力

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The purpose of this study was to investigate whether differences in body movements in 'Sonoba Shomen-uchi' (one of the attack techniques in Kendo) existed between outstanding Kendoists, 4th grade and above, and untrained volunteers. This study was especially intended to compare among the timing of forward step motion and Shinai stroke, and the intencity of hitting. Comparison between three-dimensional trunk movements, making use of PLPA (Physical Locomotion Pursuit Analyzer) and the muscular actions with recording of electromyograms was also investigated. Kendoists showed extremely smooth motions in their 'Sonoba Shomen-uchi' movements. They raised Shinai high up and pushed forward their bodies by the left foot. The left knees were stretched and supported their upper bodies. And they hit an object with small lean-forwarded position. Their trunk movements in the process of the whole movement showed such wavy locus as going down gradually at the Shinai raising and going up to the final stage of the stroke. It was found that the electromyograms of muscles indicated vary in voltage and frequency during the process. This could be said that Kendoists used their muscles effectively. Consequently they intended to step forward after the final reach, showing small time lag between hitting and stepping. It also seemed that stable intensity of the stroke was recorded. On the contrary, untrained volunteers intended to hit an object showing the right foot stepped before reaching the final stroke. They also showed higher right thigh up with lower Shinai raising. As far as their trunk movements are concerned, they moved it rapidly down from the beginning of the motion to the Shinai raising and moved up till the final stroke. At the point of reaching an object they moved down again. The electromyograms of muscle actions showed almost same and small levels in voltage and frequency during the process. This could be said that untrained volunteers contracted their muscles throughout the movement and their right or both feet stepped before the final reach. As the results of imperfect arm stretch and arm or wrist hitting, unstable intensity seemed to be recognized among untrained ones. It is possible to conclude that the lower limb motions control the upper body and arm motions in 'Sonoba Shomen-uchi' movement in Kendo.
東海大学の論文

剣道の運動生理学的研究その2 : 正面打撃動作と打撃力

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剣道の運動生理学的研究 その2 : 正面打撃動作と打撃力

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剣道の運動生理学的研究その2 : 正面打撃動作と打撃力