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Volume 43 (2010)
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Volume 43, Issue 1
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Takumi KANEMOCHI, Nobuyoshi HIROSE, Mitsuru NAKAMURA, Naoya MAEKAWA, M ...2010 Volume 43 Issue 1 Pages 1_1-1_7
Published: August 31, 2010
Released on J-STAGE: August 28, 2012
JOURNAL FREE ACCESSThe purpose of this study was to examine similarities in evaluations of judo’s NAGE NO KATA among judges and to investigate the criteria for their evaluations. This study will contribute to the establishment of an evaluation standard for NAGE NO KATA.
The participants in this study were 22 experienced judges who served as evaluators. They were asked to watch videos of NAGE NO KATA performed by two pairs of judoka (Team A and Team B), and to evaluate 13 aspects of each NAGE NO KATA performed.
The evaluation aspects were taken from “Rules of examination and viewpoints of evaluation,” contained in the guidelines of All Japan Judo KATA Competition. As the targets of this study, one technique was randomly selected from five categories of techniques. These five techniques were randomly replayed from a DVD and the evaluators rated the NAGE NO KATA performed. After the conclusion, statistics were calculated from the collected data, and the characteristics were examined by performing such analyses as correlation analysis and regression analysis.
The results showed significant differences between the evaluations of the performances of Team A and Team B. It was also observed that the evaluations of all techniques were very similar among the 22 evaluators. Although an evaluation standard for NAGE NO KATA has not been established yet, the results of this study indicated that evaluations are based on a fairly common understanding.
The results showed that there were three evaluation aspects that the evaluators regarded as important. The results also showed a high correlation among the evaluations of these items and the overall evaluation. It was shown that each evaluator had specific criteria that were considered as more important than other criteria, and that the overall evaluation depended on these specific criteria.View full abstractDownload PDF (2355K) -
Tetsuya NAKAJIMA2010 Volume 43 Issue 1 Pages 1_9-1_17
Published: August 31, 2010
Released on J-STAGE: August 28, 2012
JOURNAL FREE ACCESS“JIK1SHlNRYU JUDO — ORIGIN OF THE NAME, TECHNIQUES AND PHILOSOPHY —” a leading study on the genealogy of Jikishin-ryu-jujutsu was announced in 1990. The role of the Jikishin-ryu-yawara-jo was used in that study as a basis for arranging and presenting a genealogy of Jikishin-ryu-jujutsu. However, the reading about and understanding of the role of the Jikishir-ryu-yawara-jo were insufficient in that study, thus the genealogy of Jikishin-ryu-jujutsu as presented in that work was not arranged well enough.
In this study, the genealogy of Jikishin-ryu is reeaxamined through the Jikishin-ryu-yawara-jo, and an investigation is made as to whether Mitsuhide TERADA was the originator of Jikishin-ryu-jujutsu.
The findings of the research indicate that Mitsuhide TERADA was not the founder of Jikishin-ryu-jujutsu.View full abstractDownload PDF (3472K) -
Katsuyuki MASUCHI, Toshihiro TAKEZAWA, Jun KONNO, Shinichiro SATO, Nat ...2010 Volume 43 Issue 1 Pages 1_19-1_26
Published: August 31, 2010
Released on J-STAGE: August 28, 2012
JOURNAL FREE ACCESSThe purpose of this study is to examine the change in trunk muscle strength in judo athletes accompanying an increase in angle velocity, and to clarify the characteristics of lightweight and heavyweight athletes. Male collegiate judo athletes (16 lightweight and 17 heavyweight) and normal male college students (17) participated in the study. We used a CYBEX 770-Norm Trunk Extension/Flexion Unit to measure peak torque during trunk extension and flexion. The angle velocity was measured at 30, 60, 90, 120, 150 degree / second, according to CYBEX TEF standard protocol.
The results we achieved are as follows:
1. Peak torque during trunk flexion and extension at all angle velocities showed a high value (P < 0.01) for heavyweight, lightweight and normal students, in that order.
2. Peak torque during trunk flexion and extension for all groups showed the highest value at 30 degree / second, decreasing significantly (P<0.01) according to the increase in angle velocity.
3. With regard to peak torque during trunk extension, there was significant interaction (P<0.01) between the group and the angle velocity.
4. Moreover, in peak torque during trunk extension, the rate of decrease according to increase in angle velocity showed a low value for lightweight, heavyweight and normal students, in that order. At the highest angle velocity (150 degree / second), the lightweight athletes showed a significantly. (P<0.05) lower value in the rate of decrease compared with the other two groups.
These results suggested that the heavyweight judo athletes show a larger decrease in trunk extension force accompanying an increase in movement speed when compared with lightweight judo athletes.View full abstractDownload PDF (2711K) -
Shusaku KIRYU2010 Volume 43 Issue 1 Pages 1_27-1_38
Published: August 31, 2010
Released on J-STAGE: August 28, 2012
JOURNAL FREE ACCESSThe purpose of this study is to clarify the background and intent of Kano Jigoro when he intoroduced the concept of ishinho (method to console the spirit) as one of the objectives of judo. Kano initially described the purposes of judo as taiiku (physical education), shobu (martial arts), and shushin (to master one’s spirit). Later, Kano added ishinho as an additional objective, but the reason he did so is unknown. Upon examining Kano’s writings and the aspects of judo popularized during this period, I was able to clarify the following :
a. After 1883, judo penetrated schools as an extracurricular activity. Later, many judo clubs were established and they began holding inter-school matches.
b. Kano showed that people who trained in the descipline of judo reaped the benefits of judo-taiiku, shobu, and shushin.
c. In 1911, judo became a standard subject in Japanese high schools. Later, Kano announced the inclusion of ishinho as an objective of judo, and added additional, factors (including the pleasure of exercise; the enjoyment of watching randori, competitions, and kata; and kata as an art form) to judo.
d. Kano generated a new concept of ishinho against the background of his knowledge of dissatisfaction with normal gymnastics, the various benefits of judo, and the merit of athletic sports. With increasing inter-school matches, ishinho disappeared from Kano’s works, and students became involved in many scandals. Instead of ihsinho, Kano appealed to all people to improve this situation, whether they practiced judo or not.View full abstractDownload PDF (4834K)
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