著者

坂井 純子 加藤 達郎 平岡 秀雄 斉藤 勝

出版者

東海大学体育学部

雑誌

東海大学紀要 体育学部 (ISSN:03892026)

巻号頁・発行日

no.11, pp.p61-70, 1981

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The purpose of this study was to investigate if a volleyball player could change the course of the spike by a signal given at various stage in spiking motion, and to find the differences of the spike form on these conditions. Conditions were to make a full swing spike toward a cross course and to change the spike course toward a straight course when signal was shown. All of spike motions were filmed and analyzed. Points of view for analyzing are following : a) Initial velocity of the ball. b) Maximum velocity of the finger. c) Body angle to the direction of running. d) Direction of spiking hand after striking the ball. Results of these experiments indicates that : 1) If the signal was switched on just before the beginning of the forward swing in spiking, all subjects could change the spike course on most occasions. On this study, "just before the beginning of the forward swing" meant about 0.30 to 0.35 seconds before the beginning of the forward swing. 2) Initial velocity of the ball, on the case when the signal was given just before the beginning of the forward swing, was later than ones on the another cases. 3) However, the finger velocity of this case was faster just before meeting to the ball. 4) There were no significant differences on the body angle to the direction of running jump at the various spike motions. 5) Directions of the arm after spiking the ball was decided depending on the course of the spike.

著者

諸岡 卓也 平岡 秀雄

出版者

東海大学体育学部

雑誌

東海大学紀要 体育学部 (ISSN:03892026)

巻号頁・発行日

no.7, pp.p173-178, 1977-11

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Boxing, though it is done through the medium of a pair of gloves, is a sport which fights to the extremity by fisting, and it remains, so to speak, the most primitive form. According to the boxing game, about 3000 B. C., on Aegean Crete island, the boxers rolled soft thongs in order to protect their fists. After that, by fitting out small iron tacks or boards, they were changed from the protection of boxers' fists to a murderous weapon and arm (in Greece from 400 B. C. to A. D. 390). In modern boxing, all the boxers roll bandages as the protiction of their fists and wrists. and at the same time, so as to soften the damage given their rivals, they wear a pair of gloves. Though rolling bandages purposes the protection of boxers' fists, there is sometimes a boxing leader who insists that how to roll them makes their punching force harder, and also there is a boxer who supports the opinion. In this study, we investigated the differences of punching force in a right straight blow and a left hook in the way of two kinds of rolling bandages. We used the punching measure which is developed by Ishiyama surgery at Surugadai Hospital of Nihon University and as testees, some members of our boxing club at he University of Tokai helped us. As the result of the investigation, we could not realize the difference of punching force from the way of rolling handages, that is, no significant difference. We can say, after all, punching force is much depended on the skills of their speed, timing, angle, power and so forth. Judging from the facts that they, in spite of rolling bandages, sometimes fracture their hand bones or sprain their wrists, as the original purpose of rolling bandages is the protection of the fist and wrist, we should devise how to roll bandages.