著者

牧野 晃宗 岩崎 正徳 国正 陽子 久野 峻幸 佐野 加奈絵 村元 辰寛 村上 雷多 神﨑 浩 小田 俊明 石川 昌紀

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.61, no.2, pp.639-649, 2016 (Released:2016-12-14)

参考文献数

18

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One of the most frequent injuries in Kendo athletes is Achilles tendinopathy in the left leg, for example Achilles tendon rupture. However, preventive approaches for Achilles tendinopathy in Kendo athletes have not been well considered. Therefore, the purpose of the present study was to examine differences in the architectures of the gastrocnemius muscle and Achilles tendon in relation to kendo training experience, and to examine the mechanical properties of the Achilles tendinous tissues (AT) in Kendo athletes in order to clarify why Achilles tendinopathy occurs in the left leg. Sixty-five Kendo male athletes with different periods of kendo training experience and 20 healthy male control subjects participated in this study. The architectural properties of the medial gastrocnemius muscle (MG) and Achilles tendon in both legs were measured using ultrasonography. In addition, 20 expert Kendo male athletes and healthy male controls pair-matched with the kendo athletes for body height and body mass were examined for their AT mechanical properties during passive dorsiflexion of both legs. The differences in the cross–sectional areas of the Achilles tendon and MG muscle between the left and right legs were greater in Kendo athletes with longer experience. Especially, the expert kendo athletes had lower AT stiffness and Young's modulus in the left leg than did the control subjects. These results suggest that kendo leads to specific Achilles tendon and muscle adaptation. These specific adaptations of the MG fascicles and AT may be one of the risk factors for Achilles tendon rupture in Kendo athletes.

著者

岡田 龍司 村元 辰寛 徳安 秀正 岡崎 祐史 穴井 隆将 倉賀野 哲造

出版者

近畿大学教養・外国語教育センター

雑誌

教養・外国語教育センター紀要. 一般教養編 Kinki University, Center for Liberal Arts and Foreign Language Education journal (ISSN:24322814)

巻号頁・発行日

vol.6, no.1, pp.13-21, 2016

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"Uchi-mata" difference was discovered by using available motion pictures.The motion pictures were disassembled into frame data called AVI,which is a file format for storing audio and video information developed by Microsoft Corp.The motions performed by participants while using Judo standin " Uchimata" were analyzed using a software system based on "Open CV",which is an open source library for computer vision and image processing developed by Intel Corp.The positions of parts of the body were indicated manually on to the AVI pictures based on the "frame by frame playback" technique, then put into a computer. The compensation of pixel values to the real space size was performed by using the known length of the" tatami" in the AVI picture.By repeating these,the positions of the body were traced corresponding to the frame rate.The compensated positional data of the body was gathered and then disassembled into x direction-time data and y direction-time data to calculate velocity. In this manner,the velocity of the specified body parts of the thrown opponent were calculated.The subjects selected were two leading Judo men.When he threw his opponent down,his motion of his stand technique of" Uchi-mata" was analyzed.This is a case study of motion analysis of Judo using available motion pictures.We have given an example of an analysis method for Judo from an engineering point of view.