著者

清水 聖志人 永見 智行 森山 倫良 佐藤 満

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.25, no.2, pp.177-187, 2012-03-20 (Released:2019-09-02)

参考文献数

10

被引用文献数

2

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This study focused on the takedown movements of female Japanese World Champion wrestlers in competition. Take down time which conducted from touching leg to getting point and these movements of two World champions were compared with those of other of other high level athletes.     As a result, World Champion had much higher number of effective takedown and much shorter the takedown time than other wrestlers. The following four findings were obtained as characteristics of a successful takedown movement. 1)Stayed in a forward leaning stance. 2)Head direct movement toward trajectory with little up and down motion. 3)The step back (jab step) of the trail leg was short. 4)Takes a leg attack with the opponentʼs loss of balance.     It is thought that a practical application of these findings could result in more effective coaching and training.

著者

永見 智行

出版者

北里大学

雑誌

基盤研究(C)

巻号頁・発行日

2023-04-01

著者

清水 聖志人 永見 智行 森山 倫良 佐藤 満

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.25, no.2, pp.177-187, 2012

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<p>&nbsp;&nbsp;&nbsp;&nbsp;This study focused on the takedown movements of female Japanese World Champion wrestlers in competition. Take down time which conducted from touching leg to getting point and these movements of two World champions were compared with those of other of other high level athletes. <BR>&nbsp;&nbsp;&nbsp;&nbsp;As a result, World Champion had much higher number of effective takedown and much shorter the takedown time than other wrestlers. The following four findings were obtained as characteristics of a successful takedown movement. <BR>1)Stayed in a forward leaning stance. <BR>2)Head direct movement toward trajectory with little up and down motion. <BR>3)The step back (jab step) of the trail leg was short. <BR>4)Takes a leg attack with the opponentʼs loss of balance. <BR>&nbsp;&nbsp;&nbsp;&nbsp;It is thought that a practical application of these findings could result in more effective coaching and training.</p>

著者

永見 智行 木村 康宏 彼末 一之 矢内 利政

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

pp.16021, (Released:2016-08-29)

参考文献数

25

被引用文献数

4 5

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In this study, we analyzed the kinematic characteristics of various types of baseball pitches by elite baseball pitchers, and tested a null hypothesis that “no type of pitch has the same kinematic characteristics as another.”  A high-speed video camera was used to record the initial trajectory of the pitched ball thrown by 84 skilled baseball pitchers. Each pitcher was asked to throw all the different types of pitch he would use in competition and practice, and to self-declare the type of pitch used for each throw. The kinematic characteristics of each pitched ball were analyzed as ball speed, the direction of the spin axis, and the spin rate. A custom-made device was used to analyze the direction of the spin axis and the spin rate, and the ball speed was measured with a radar gun. One-way ANOVA with the Games-Howell post hoc test was used to test the hypothesis.  The total of 364 pitches were categorized into 11 self-declared pitch types. Four of 10 pitch types thrown by more than one pitcher - the four-seam fastball, slider, curveball and cutter - had unique kinematic characteristic distinct from all of the other pitch types. No significant differences were found in any of the kinematic parameters between 1) changeup and sinker, 2) forkball and split-fingered fastball, and 3) two-seam fastball and shoot ball. Therefore, the hypothesis was retained for these three pairs of pitch types: although they were kinematically similar, the pitchers categorized them as different types.  When the breaking ball was compared with the four-seam fastball, they were classifiable into three types: 1) pitches with a slower ball speed and lower spin rate with a different direction of spin axis (changeup, sinker, forkball and split-fingered fastball), 2) pitches with a slower ball speed, different direction of the spin axis and a spin rate comparable to the four-seam fastball (slider, curveball and cutter), and 3) pitches with a comparable ball speed, similar spin axis direction, and lower spin rate (two-seam fastball and shoot ball). These data revealed that the kinematic characteristics of some pitch types are quite different from those described in baseball coaching handbooks.

著者

永見 智行 小宮山 悟 彼末 一之 諸星 潤 大室 康平 茶川 剛史 勝亦 陽一 氏原 洋輔 子安 大士 前川 仁

出版者

一般社団法人 日本機械学会

雑誌

ジョイント・シンポジウム講演論文集:スポーツ工学シンポジウム:シンポジウム:ヒューマン・ダイナミックス

巻号頁・発行日

vol.2008, pp.108-111, 2008

被引用文献数

1 1

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The authors have recently developed a system for analyzing the spin on a baseball (Koseki et al., 2007). In the present study we analyzed the spin pitched by a professional pitcher. He pitched eight different pitches, each twice, from official pitching mound. The image of ball in the period from just before to 500 ms after the ball release was taken with a high speed video camera at 1000 fps. English alphabets E, M, A, and I were marked on the ball for image processing. Feature points from the image stream were assembled into a set of linear equations that represents orientation change between consecutive two frames by rotation matrix R, and the direction of spin axis and spin rate were obtained. Both values varied considerably depending on pitches. The recording of spin was suggested to be valuable for training if the data could be combined with those of motion analysis.

著者

永見 智行

出版者

早稲田大学

雑誌

若手研究(B)

巻号頁・発行日

2013-04-01

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本研究では野球投球時の上肢・体幹部の動作がボールの回転に与える影響を明らかにした.その結果,(1)直球との差異という観点からは,変化球は3つのグループに分類されること,(2)3つのグループのうち,直球と同程度の回転スピードのまま回転軸方向を変更する球種群(スライダー,カーブ等)では,リリース直前の肘関節回外角度を増大させることで直球と乖離するような回転軸方向に調節していること,(3)この回外角度の変化およびそれに伴うボール回転軸方向の変化は,同一球種投球時の日間変動としても起こること,が示唆された.これらの結果は,投手のトレーニング,コンディショニングに活用できる可能性がある.