著者

川村 卓 島田 一志 下山 優 Kawamura Takashi Shimada Kazushi Shimoyama Yutaka

出版者

筑波大学体育科学系

雑誌

体育科学系紀要 (ISSN:03867129)

巻号頁・発行日

vol.35, pp.59-66, 2012-03

著者

森本 吉謙 伊藤 浩志 島田 一志 川村 卓 阿江 通良 村木 征人

出版者

日本スポーツ方法学会

雑誌

スポーツ方法学研究 (ISSN:09183086)

巻号頁・発行日

vol.16, no.1, pp.13-26, 2003-03

著者

梶田 和宏 川村 卓 島田 一志 金堀 哲也 八木 快

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.32, no.2, pp.171-187, 2019-03-20 (Released:2019-09-02)

参考文献数

55

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This study clarifies the features of throwing motion to second base of professional baseball catchers.Eleven catchers of two Nippon Professional Baseball Organization teams were participants. Using the highest confidence data among analytical trials for throwing time, we defined it as ‘the time required from catching until ball arriving at second base with shortest time’. Following five characteristic features were revealed. 1) In time parameter, professional catchers have a difference in motion time (the time required from catching to release in amateur catchers), especially during the beginning phase having a relation with duration time (arrival time from the ball release to the second base), the throwing phase having a relation with the throwing time and release speed (speed average of ball speed of 3 frames after releasing the ball), and the grip changing phase having a relation with motion time. 2) Further, professional catchers have a tradeoff relationship between the motion time and the duration time as well as amateur catchers; and, particularly good professional catchers can shorten the duration time even while shortening motion time leading to shortening of the throwing time. 3) In stride parameter, professional catchers have a difference in the length of the pivot foot in amateur catchers, especially, the X component has a relation with the motion time while the Y component has a relation with the duration time, and the stride length is likewise; there was no relationship between all the items. 4) In release parameter, professional catchers maintain a higher projection height of the ball than amateur catchers and maintain the tendency of the projection angle to be lower, improving the throwing accuracy, especially the elevation angle is related to the duration time and the release speed, but the azimuth angle is likewise; there was no relationship between all the items. 5) In center of gravity of the body, professional catchers have a relation with the movement speed of the center of gravity of the body and the release speed as well as amateur catchers, but the moving distance of center of gravity of the body is likewise; there was no relationship between all the items.

著者

金堀 哲也 山田 幸雄 會田 宏 島田 一志 川村 卓

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.59, no.1, pp.133-147, 2014 (Released:2014-06-13)

参考文献数

28

被引用文献数

6 2

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The purpose of this study was to clarify the viewpoint of a well-experienced baseball coach when evaluating batting skills using kinematics indices. Method: First, three baseball coaches evaluated sixteen baseball players in their own teams. The players were divided subjectively into a first superior (FG) group and a second superior (SG) group according to batting ability. Next, the hitting motion of all sixteen players was captured using a VICON system (9 cameras, 250 Hz). We measured the speed of the batted and pitched ball, or the timing of release by the pitcher, using three synchronized high-speed cameras (250 Hz). From these kinematics data, we calculated several kinematics indices for each batter, focusing especially on the indices for motion of the lower extremities and trunk. In contrast, a well-experienced expert coach who had never met these players evaluated the hitting motion of each player using only motion films without the above kinematics indices, and similarly divided them into FG and SG. The evaluation of fourteen players agreed between the team coaches and the expert coach. The FG and the SG each comprised seven players. We analyzed these fourteen players using the kinematics indices, and clarified objectively the differences in hitting motion between the two groups. Results & Conclusions: The speed of swing, batted ball speed and physical index were approximately the same in the two groups. However, players in the FG group showed a significantly longer distance of center of gravity migration in step than those in the SG group. This might have been attributable to the hip abduction movement on the pivot side on the basis of kinematics indices (p<0.05). Moreover, players in the FG group took more time in step, and swung in a shorter time after landing on the stepped foot, relative to the players in the SG group (p<0.05). These results suggest that the well-experienced expert coaches paid particular attention to the above hitting motion rather than the speed of swing, batted ball speed and physical index as coaching points.

著者

島田 一志 阿江 通良 藤井 範久

出版者

日本バイオメカニクス学会

雑誌

バイオメカニクス研究 (ISSN:13431706)

巻号頁・発行日

vol.8, no.1, pp.12-26, 2004

被引用文献数

1

著者

川村 卓 島田 一志 高橋 佳三 森本 吉謙 小池 関也 阿江 通良

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

pp.0812080087, (Released:2008-12-10)

参考文献数

20

被引用文献数

25 4

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The purpose of this study was to analyze three-dimensionally two groups of baseball strikers, i.e. high and low swing speed groups, and to compare the kinematics of their upper limb motion. Sixteen skilled male strikers were videotaped with two synchronized high-speed video cameras operating at 200 Hz. One trial in which the maximum bat head speed was achieved was selected for each subject and digitized to obtain three-dimensional coordinates of the segment end-points and the bat using a DLT technique. Subjects were divided into High (n=8) and Low (n=8) groups according to the bat head speed. The angles compared between the two groups were abduction-adduction, horizontal abduction-adduction, flexion-extension and internal-external rotation for both shoulders, flexion-extension for both elbows, supination-pronation for both forearms, radius-ulnar flexion, and dorsi-palmar flexion for both hands. The sequential data were normalized with the time from the point when the speed of the grip was over 3 m/s to the ball impact, and then averaged.

著者

金堀 哲也 岡本 嘉一 小倉 圭 前原 淳 島田 一志

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

巻号頁・発行日

vol.68, pp.217_2, 2017

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<p> 成長期の野球選手における野球肘の有病率は非常に高く、野球肘の早期発見および予防の重要性が提言されている。野球肘の発症要因には酷使をはじめとして、ポジションや投球動作など、様々な要因が複雑に絡み合っている。Okamoto et al.(2016)は、学童期野球選手を対象にMRI診断を行った結果、41.9%に異常所見がみられたものの、投球数、投球頻度、ポジションとの関係性はなかったと報告している。すなわち、野球肘の発症要因において、投球動作との関連性は少なくないと考えられる。そこで本研究は、肩・肘に痛みのない学童期野球選手60名を対象に、肘関節MRI診断および投球動作の3次元動作解析を併用することで、MRI診断結果と投球動作の関係性について検討し、野球肘の発症要因となる投球動作を明らかにすることを目的とした。その結果、踏出足着地時の投球腕肩関節の外転角度においてMRI陰性群のほうが有意に小さかった。また、踏出足着地時の肩と腰の回転角度の差においてMRI陰性群のほうが有意に大きかった。以上のことから、踏出足着地時の姿勢がその後の投球腕の動作に影響を及ぼし、肘関節への過度な負荷を加えている可能性が示唆された。</p>

著者

島田 一志 阿江 通良 藤井 範久 川村 卓 高橋 佳三

出版者

日本バイオメカニクス学会

雑誌

バイオメカニクス研究 (ISSN:13431706)

巻号頁・発行日

vol.8, no.1, pp.12-26, 2004-03-31 (Released:2023-03-11)

参考文献数

27

被引用文献数

31

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The purpose of this study was to analyze the mechanical energy during baseball pitching for 22 varsity baseball players by using three-dimensional motion analysis technique with two force platforms. Joint torque powers, joint force powers, and segment torque powers of the joints were computed using an inverse dynamics approach.In the energy increasing phase of upper torso, a great deal of mechanical energy flowed into the torso. The mechanical energy transferred to the upper torso due to the segment torque power significantly related to the ball velocity at the release (r=0.480, p<0.05). In the late cocking and accelerating phase, great mechanical energy flowed into the distal segment and the ball due to the joint force power were observed at the throwing arm joints. There were significant relationships between the ball velocity at the release and mechanical energy flows due to the elbow and the wrist joint force powers (r=0.775, p<0.001 and r=0.827, p<0.001). These results suggested that the mechanical energy flows to the upper torso in the energy increasing phase of upper torso and to the throwing arm and ball in the late cocking phase are important to increase the ball release velocity.

著者

谷川 聡 島田 一志 岩井 浩一 尾縣 貢

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.53, no.1, pp.75-85, 2008-06-30 (Released:2008-09-13)

参考文献数

34

被引用文献数

7 1

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Walking, jogging and sprinting occur repeatedly in daily life and also many sports events. The present study was undertaken to clarify whether the different kinematic characteristics of sprinting movements between sprint-skilled athletes and non-athletes are common to the those of walking and running movements. Nine male athletes and eleven untrained male students were asked to perform walking, fast-walking and jogging at set speeds (walking: 1.5 m/s; fast-walking, jogging: 2.4 m/s), and sprinting at maximal speed. Walking, fast-walking and jogging movements were recorded by digital video camera and sprinting movement by high-speed video camera. Kinematic variables obtained from video analysis were compared between two groups and within each group. Double support time of fast-walking and contact time of jogging and sprinting were significantly shorter in athletes. Minimal knee angles in jogging and sprinting were significantly larger, and knee angular displacements and hip angle at left foot contact in fast-walking, jogging and sprinting were significantly smaller in athletes. Touch down distances were significantly shorter in all movements and right hip joint angle was small at right foot contact in fast walking, jogging and sprinting. Leg scissors movement was a characteristic of athletes. During the support phase, non-athletes tended to flex not only the knee joint but also the hip joint at foot contact, while athletes tended to keep on extending hip and knee joints. These results suggest that differences exist between two groups and that there are common characteristics of the movements in each group, which could be technically significant from a coaching viewpoint.

著者

森本 吉謙 伊藤 浩志 島田 一志 川村 卓 阿江 通良 村木 征人

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.16, no.1, pp.13-26, 2003-03-31 (Released:2021-03-31)

著者

川村 卓 島田 一志 高橋 佳三

出版者

筑波大学体育センター

雑誌

大学体育研究 (ISSN:03867129)

巻号頁・発行日

no.28, pp.63-71, 2006-03

著者

林 卓史 奈良 隆章 島田 一志

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

巻号頁・発行日

vol.70, pp.248_2, 2019

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<p> 本研究では、大学野球リーグ戦において「特徴のある投手」とはどのような投手であるかについて検討した。また、「特徴のある投手」が複数名在籍することが、継投の選択肢に与える影響を検証した。対象は、著者が投手コーチを務めたK大学野球部であり、期間は2018年リーグ戦(春季・秋季)とした。投手を①リリース速度②回転速度③投球腕(左腕)④変化球の割合について基準を設定し、4項目の内、2項目を満たす投手を、「特徴のある投手」とした。リリース速度と回転速度については、練習での投球を、トラッキングシステムを用いて計測し、140km/h、2300rpmを基準とした(林・佐野,2019)。K大学には、2018年春季リーグ戦において、4項目の内2項目以上を満たす投手が7名存在した。同リーグ戦では継投を多用し、チーム防御率はリーグ1位となった。一方、2018年秋季リーグ戦では、2項目以上を常時満たす投手は1名であり、同リーグ戦では、1名の投手に依存し、チーム防御率はリーグ5位となった。このことから、上記の4項目の内2項目を満たす「特徴のある投手」を多く育成することが、継投の選択肢を多様にすることが示唆された。</p>

著者

谷川 聡 島田 一志 一川 大輔 吉岡 宏 尾縣 貢

出版者

The Japan Journal of Coaching Studies

雑誌

コーチング学研究 (ISSN:21851646)

巻号頁・発行日

vol.24, no.2, pp.129-138, 2011-03-20 (Released:2019-09-02)

参考文献数

42

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The purpose of this study was to investigate the effect of sprint technical training program on sprint and jump ability of soccer players in competition season.     The first group ( n=13, ST group) performed a combined resistance and sprint training program at same training session. The second group ( n=6, JT group) performed a combined jump and sprint training and the third group ( n=6, MT group) performed jog-walk and sprint training with technical instructions. Squat jump, Countermovement jump, Rebound drop jump, Standing long jump and 3 steps long jump were tested as jump performance. The 30-m and 80-m dash and agility run were tested as sprint performance. Sprint movement of JT and MT groups were recorded by high speed video camera.     After training, JT group performed faster significantly in the 30m dash, while MT group in 80m dash. JT and MT groups performed faster in sprint velocity with longer stride length and performed better in 3 steps long jump, while ST group performed slower in the 30m and 80m dash. We suggested that stiff leg of JT group and early leg scissors timing of the MT group made them run faster with longer stride length.     We must take into consideration difference of the effect of ST, JT and MT program based with sprint technique in competition season. It is concluded that coaches have to assess the optimal balance between soccer training and sprint training components.

著者

道上 静香 阿江 通良 島田 一志

出版者

一般社団法人 日本体育学会

雑誌

日本体育学会大会号 第48回(1997) (ISSN:24330183)

巻号頁・発行日

pp.349, 1997-08-29 (Released:2017-08-25)

著者

島田 一志 川村 卓

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62回(2011) (ISSN:24241946)

巻号頁・発行日

pp.149, 2011-09-25 (Released:2017-04-06)

著者

川村 卓 島田 一志 高橋 佳三 森本 吉謙 小池 関也 阿江 通良

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.53, no.2, pp.423-438, 2008-12-10 (Released:2009-02-25)

参考文献数

20

被引用文献数

25 4

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The purpose of this study was to analyze three-dimensionally two groups of baseball strikers, i.e. high and low swing speed groups, and to compare the kinematics of their upper limb motion. Sixteen skilled male strikers were videotaped with two synchronized high-speed video cameras operating at 200 Hz. One trial in which the maximum bat head speed was achieved was selected for each subject and digitized to obtain three-dimensional coordinates of the segment end-points and the bat using a DLT technique. Subjects were divided into High (n=8) and Low (n=8) groups according to the bat head speed. The angles compared between the two groups were abduction-adduction, horizontal abduction-adduction, flexion-extension and internal-external rotation for both shoulders, flexion-extension for both elbows, supination-pronation for both forearms, radius-ulnar flexion, and dorsi-palmar flexion for both hands. The sequential data were normalized with the time from the point when the speed of the grip was over 3 m/s to the ball impact, and then averaged.1 Angles of elbow extension, forearm supination of the top arm, and ulnar flexion of both hands were much changed. However, the angles of both shoulder joints, bottom elbow and bottom forearm showed little change.2. The High group showed significantly larger shoulder adduction and horizontal adduction of a bottom arm than the Low group in 0–10% time and 50–70% time (p<0.05). The High group showed significantly smaller top elbow extension than the Low group in 40–70% time and 90–100% time (p<0.05).3. The High group showed significantly smaller top hand supination than the Low group in 100% time. In the time, the High group showed significantly larger bottom forearm pronation than the Low group in 50–70% time (p<0.05). The High group showed significantly larger dorsiflexion of the bottom hand than the Low group in 20–30% time (p<0.05).

著者

梶田 和宏 川村 卓 島田 一志 八木 快

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

巻号頁・発行日

vol.66, pp.319-320, 2015

著者

高橋 佳三 阿江 通良 藤井 範久 功力 靖雄 島田 一志 石川 陽介

出版者

一般社団法人 日本体育学会

雑誌

日本体育学会大会号 第49回(1998) (ISSN:24330183)

巻号頁・発行日

pp.371, 1998-08-20 (Released:2017-08-25)

著者

奈良 隆章 川村 卓 島田 一志 Nara Taka-aki Kawamura Takashi Shimada Kazushi

出版者

筑波大学体育センター

雑誌

大学体育研究 (ISSN:03867129)

巻号頁・発行日

no.33, pp.1-10, 2011-03