著者

波戸 謙太 金堀 哲也 谷川 聡 梶田 和宏 奈良 隆章 川村 卓

出版者

日本コーチング学会

雑誌

コーチング学研究 (ISSN:21851646)

巻号頁・発行日

vol.35, no.1, pp.1-17, 2021-10-20 (Released:2021-12-28)

参考文献数

32

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This study delineates the common characteristics of pitching motion in professional baseball pitchers by focusing on their lower limbs. Further, to gain an insight into the development of athletic capacity, the pitching motion of the Top group was compared with the Minor group, resulting in the clarification of lower limb issues in the Minor group. Data analysis was performed using a test with the highest score in a 5-point objective evaluation by the observer and the highest ball speed in the tracking data obtained from Trackman, with the following results: (1) The common characteristics in a professional baseball pitcher was that the hip joint was flexed while the stride leg knee joint angle was fixed to MBV (Minimum Ball Velocity), MER (Maximal Shoulder External Rotation), and the stride leg hip joint and knee joint were slightly extended to MER, REL (Ball Release). (2) Regarding the difference between the Top and Minor groups, it is suggested that the Top group accelerates the rotational speed of the lower torso to SFC (Stride Foot Contacts Ground), which increases the angular velocity of adduction of the hip joint of the stride leg, resulting in torsion of the trunk and stable force transmission after MBV. (3) In the Top group after SFC, the angular displacement and angular velocity was such that the hip joints of both legs were fixed. Additionally, the stride leg hip joint was in adduction, which caused the motion to increase the rotation of the lower and upper torsos. Authors suggest considering these key points while coaching baseball.

著者

波戸 謙太 木野村 嘉則

出版者

一般社団法人 日本体育学会

雑誌

日本体育学会大会予稿集 第68回(2017) (ISSN:24241946)

巻号頁・発行日

pp.235_2, 2017 (Released:2018-02-15)

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本研究は、野球初心者が全力投球を反復した際の球質の動態を明らかにすることで、その際に内在する諸問題について検討し、特にスピードトレーニングの投球練習における適正反復投球数について検討することを目的とした。実験試技は、野球初心者である男性2名に対して、屋内において捕手方向に各々の最大努力度によって、フォーシームの握りでストレートを投球させた。投球数は20球1セットとし、合計5セットの計100球の投球を行わせた。その結果、投球数の増加に伴い、ボール速度が減少した。その際、セット内における球速および回転数の変動が大きかった。さらに、野球経験者と比較すると、球速が低く回転数が少なかった。よって、野球初心者はボール速度を増大することに加え、回転数を増大させること、球質を安定させることもトレーニング課題となりえることが想定される。また、野球初心者では、21~40球目にボール速度の大きな減少がみられたことから、スピードトレーニングの投球数は20球までを適正反復回数の目安とすることで、より効率よく球速をはじめとした球質の向上への効果を期待できる可能性が示唆された。

著者

波戸 謙太 金堀 哲也 蔭山 雅洋 八木 快 谷川 聡 川村 卓

出版者

日本コーチング学会

雑誌

コーチング学研究 (ISSN:21851646)

巻号頁・発行日

vol.36, no.2, pp.159-176, 2023-03-20 (Released:2023-03-31)

参考文献数

44

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This study delineates the common characteristics of pitching motion in professional baseball players (Top and Minor groups) by focusing on their upper body. With an aim to gain insight into the development of athletic abilities, the pitching motion of the Top group was compared with the Minor group, resulting in the clarification of upper limb issues in the Minor group and amateur pitchers. The subjects were 47 pitchers belonging to the Nippon Professional Baseball (NPB). The experiment was a fastball pitch with maximum effort. The analyzed trial was the highest ball velocity (average ball velocity 38.9 ± 1.8 m/s). Post-analysis, the following commonalities and differences were identified. (1) There is a commonality in the sizeable external rotation of the shoulder joint during MER (Maximum External Rotation), which is considered a factor in pitching speed compared to amateur pitchers. However, after evaluating the professional baseball pitchers, it was suggested that this movement had a low influence on the ball velocity. (2) There was a commonality in the movements in which the maximum shoulder horizontal adduction angular velocity was more significant than the upper trunk angular velocity. (3) However, in terms of differences among professional baseball pitchers, the Top group pitchers had a greater horizontal adduction angular velocity of the shoulder joint during MER and a more significant extension angular velocity of the elbow joint during REL (Ball Release) by suppressing the forward tilt angular velocity of the trunk during MER.

著者

小野寺 和也 森本 吉謙 入澤 裕樹 波戸 謙太

出版者

Japan Society of Sports Industry

雑誌

スポーツ産業学研究 (ISSN:13430688)

巻号頁・発行日

vol.30, no.3, pp.3_325-3_329, 2020 (Released:2020-07-24)

参考文献数

11

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In recent years, various measuring instruments have been introduced in baseball fields, and various kinds of objective data can be collected immediately. However, the method of utilizing the data in the coaching field is still being searched for. In order to utilize objective data in the baseball coaching scene, it is necessary to examine the relations between various subjective aspects of players and coaches and the objective data. The purpose of this study was to examine the relationship between the feeling of swinging a bat and swing speed, and to obtain a reference for coaching practice and future research. The subjects were five fielders belonging to the X Baseball Team. Subjective evaluation was performed using VAS on the feeling of swinging the bat during 20-23 days of practice. At the same time, the swing speed was measured. The correlation between the subjective evaluation of the feeling of swinging the bat and the swing speed was verified. As a result, no significant correlation was observed in all five subjects. It was suggested that there was no relationship between the feeling of swinging the bat and the swing speed.

著者

木野村 嘉則 木下 達生 波戸 謙太 葛原 憲治 Yoshinori Kinomura Tatsuo Kinoshita Kenta Hato Kenji Kuzuhara 愛知東邦大学人間健康学部 東邦高等学校 専任講師 筑波大学大学院人間総合科学研究科体育学専攻 愛知東邦大学人間健康学部

雑誌

東邦学誌 = TOHO GAKUSHI (ISSN:02874067)

巻号頁・発行日

vol.46, no.2, pp.93-104, 2017-12-12