著者

前田 奎 大山卞 圭悟 関 慶太郎 水島 淳 広瀬 健一 尾縣 貢

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.18002, (Released:2019-01-21)

参考文献数

38

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The purpose of this study was to investigate, using path analysis, causal relationships among motion factors for achieving a high release velocity in the male discus throw. The throwing motions of 61 male discus throwers were analyzed using three-dimensional motion analysis. Variables such as release velocity, velocities gained by each body segment, body segment velocity, body angle and angular velocity were obtained. The path model indicating the causal relationships among these factors was constructed by path analysis. The main results were as follows: Influences of velocities gained by each body segment on release velocity were largest for the arm, followed in order by the trunk and legs. Motion factors such as weight shift, acquisition of the velocity of the center of gravity, sweeping the legs, rotations of the hip and shoulder, twisting and untwisting of the trunk, acquisition of the velocity of the right knee and extension of the left knee had direct or indirect influences on the velocities gained by each body segment. Motion factors in the path model revealed causal relationships along the time sequence of the throwing motion. In addition, the path model in this study indicated the cause and effect structure of the throwing motion by which Japanese male discus throwers were able to achieve a high release velocity. The results of this study can be utilized for technical coaching of the discus throw based on causal relationships.

著者

水島 淳 梶谷 亮輔 九鬼 靖太 柴田 篤志 前田 奎 大山 卞 圭悟 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.66, pp.703-714, 2021 (Released:2021-10-20)

参考文献数

28

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Introduction: The purpose of this study was to investigate the effects of a 4-week barefoot sprint training program on sprint biomechanics and stretch-shortening cycle jump ability. Methods: Fourteen children with no experience in barefoot sprinting were randomly assigned to 1 of 2 groups: a barefoot training group (3 boys and 4 girls; age, 11.0 ± 0.8 years-old; height, 143.1 ± 8.4 cm; body mass, 35.4 ± 5.6 kg; shoe mass, 0.17 ± 0.02 kg) and a control group (3 boys and 4 girls; age, 11.0 ± 0.8 years-old; height, 142.6 ± 8.2 cm; body mass, 34.4 ± 6.4 kg; shoe mass, 0.18 ± 0.01 kg). The 4-week intervention consisted 40 minutes of sprint training per weekly session using the allocated footwear. Before and after the intervention, 2-dimensional biomechanical analysis of the 50-m maximal sprint under both shod and barefoot conditions, and the countermovement jump and 5 repeated rebound jumping tests were performed by both groups. Pre- to post-test changes in spatio-temporal parameters and sprint kinematics, and jump heights for both jump types, and the contact time and rebound jump index for the rebound jump, were analysed using 2-way mixed ANOVA. Results and Discussion: After the 4-week intervention, a higher step frequency (p <0.01), a longer step length (p <0.05), and a higher sprint velocity (p <0.01) were observed in the barefoot training group, although no change was observed in the foot strike patterns and the swing leg velocity. The barefoot training group showed a higher rebound jump index (p <0.05) and a shorter contact time (p <0.01), while no differences were evident in the counter-movement jump height. These results suggest that 4-week barefoot sprint training seems to be an effective strategy for improving certain aspects of sprint biomechanics and for development of fast stretch-shortening cycle ability in children.

著者

前田 奎 大山卞 圭悟 関 慶太郎 水島 淳 広瀬 健一 尾縣 貢

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.64, no.1, pp.21-36, 2019-06-17 (Released:2019-06-25)

参考文献数

38

被引用文献数

1

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The purpose of this study was to investigate, using path analysis, causal relationships among motion factors for achieving a high release velocity in the male discus throw. The throwing motions of 61 male discus throwers were analyzed using three-dimensional motion analysis. Variables such as release velocity, velocities gained by each body segment, body segment velocity, body angle and angular velocity were obtained. The path model indicating the causal relationships among these factors was constructed by path analysis. The main results were as follows: Influences of velocities gained by each body segment on release velocity were largest for the arm, followed in order by the trunk and legs. Motion factors such as weight shift, acquisition of the velocity of the center of gravity, sweeping the legs, rotations of the hip and shoulder, twisting and untwisting of the trunk, acquisition of the velocity of the right knee and extension of the left knee had direct or indirect influences on the velocities gained by each body segment. Motion factors in the path model revealed causal relationships along the time sequence of the throwing motion. In addition, the path model in this study indicated the cause and effect structure of the throwing motion by which Japanese male discus throwers were able to achieve a high release velocity. The results of this study can be utilized for technical coaching of the discus throw based on causal relationships.

著者

前田 奎 大山卞 圭悟 尾縣 貢

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.137-148, 2021

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<p>&nbsp;&nbsp;&nbsp;&nbsp;This study reports a coaching case of a male athlete (abbreviated to "athlete A" after this) who had a problem that left foot lands on the "under-rotation" position during second-turn phase in the discus throw. Since athlete A is the author, this study shows processes and reflections of self-coaching. First, one of the factors which caused "underrotation" was that athlete A was too self-conscious about quick touchdown of left foot during second-turn phase. Then, "turn drill without landing left foot" and "half-turn throw" were adopted as technical training to resolve "under-rotation". Although the number of trials which left foot lands on the "under-rotation" position reduced to a certain degree after both training, the problem had not been resolved completely. However, coaching processes showed in this study can contribute accumulation of a case study to construct general theory about resolving "under-rotation" in the discus throw.</p>

著者

水島 淳 前田 奎 広瀬 健一 大山卞 圭悟 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.32, no.1, pp.71-78, 2018-10-20 (Released:2019-09-02)

参考文献数

21

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The aim of this study was to investigate the coaching beliefs of foreign high-performance track and field coaches in South East Asian countries. Five foreign coaches from Germany, Portugal, and New Zealand who represented Malaysia and Singapore in track and field events at the South East Asian Games in 2017 were asked to participate and were interviewed in this study. For the purposes of this research, the factors believed most important for coaching from the coach’s perspective were asked. The results showed that the coaching beliefs of foreign high-performance track and field coaches in South East Asian countries were divided into 3 categories. These were (a) goal oriented: developing athletes’ competence and developing athletes’ character; (b) coaches’ knowledge oriented: professional knowledge, and interpersonal and intrapersonal knowledge; and (c) coaching context oriented: coaching context.

著者

前田 奎 鈴木 楓太 束原 文郎 成相 美紀 吉中 康子 松木 優也 池川 哲史

出版者

公益社団法人 全国大学体育連合

雑誌

大学体育スポーツ学研究 (ISSN:24347957)

巻号頁・発行日

vol.19, pp.62-72, 2022 (Released:2022-09-28)

参考文献数

21

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<目的>本研究の目的は,コロナ禍における遠隔による大学スポーツ授業を通じて,受講者の「社会人基礎力」(経済産業省(METI)が提唱)がどのように変化するのかを記述し,その変化の背景を検討することである.本研究で対象としたSLS(スポーツ・ライフスキル)という大学スポーツ授業は,「社会人基礎力」の育成を目指したものである.<方法>新型コロナウイルスの影響を受け,第5回目(Pre:実技授業開始時点)および第15回目(Post:実技授業終了時点)において,受講生を対象に「社会人基礎力」の12の能力要素に関して,自己評価による調査を実施した.1598名の大学スポーツ授業の受講者のうち,PreおよびPostの両方の調査に回答した188名(学年:1年生123名,2年生65名,性別:男子120名,女子65名,回答しない3名)が本研究の分析対象であった.各項目の値のPreとPostの比較には,Wilcoxon符号付順位和検定を用いた.<結果および考察>本研究の主な結果は次の通りである:12の構成要素のうち,「働きかけ力」(z = -2.26,p < 0.05),「課題発見力」(z = -2.48,p < 0.05),「計画力」(z = -2.62,p < 0.01),「創造力」(z = -3.99,p < 0.01),「発信力」(z = -3.95,p < 0.01)および「傾聴力」(z = -2.49,p < 0.05)について,授業後が授業前よりも有意に高値を示した.また,「社会人基礎力」を構成する3つの力をみると,「考え抜く力(シンキング)」(z = -3.85,p < 0.01)および「チームで働く力(チームワーク)」(z = -2.25,p < 0.05)について,授業後が授業前よりも有意に高値を示した.これらのことから,「働きかけ力」,「課題発見力」,「計画力」,「創造力」,「発信力」および「傾聴力」は遠隔による大学スポーツ授業でも育成可能であることが示唆された.本研究の結果は,コロナ禍あるいはアフターコロナにおける効果的な遠隔による大学スポーツ授業の一助となる.一方,対面授業を実施することによって育成できる能力要素が多く存在する可能性もある.したがって,今後はそれらの能力を育成するための授業についても研究を進める必要がある.

著者

前田 奎 大山卞 圭悟 広瀬 健一 尾縣 貢

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.31, no.2, pp.175-184, 2018-03-20 (Released:2019-09-02)

参考文献数

18

被引用文献数

2

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The purposes of this study were to clarify the influence of physical strength on throwing distance, and to estimate strength requirement for each target throwing distance of discus. The questionnaire method was used to investigate parameters about morphology and physical strength for 114 male discus throwers. Pearson’s correlation coefficient was calculated to investigate the relationships between the parameters and throwing distance. Then, multiple regression analysis was carried out to clarify influence of the parameters on throwing distance. As a result, all parameters correlated significantly to throwing distance. The parameters of morphology to have great influence on throwing distance were span of arm and body weight. The parameters of physical strength to have great influence on throwing distance were backward over head shot throw, snatch, standing five steps jump, 30m dash, in descending order. In addition, physical strength requirement corresponding to throwing distance of discus was gained by estimating the standard value of each parameter from the regression analysis. Strength requirement shown in this study has a high practicality for coaches and throwers in planning training programs and setting goals.

著者

前田 奎 大山卞 圭悟 加藤 忠彦 水島 淳 山本 大輔 梶谷 亮輔 広瀬 健一 尾縣 貢

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.69, pp.206_3, 2018

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<p> 円盤投の指導現場において、投てき動作前半の局面で円盤あるいは円盤を保持する腕を積極的に加速させる動作について、「円盤を走らせる」という表現が用いられている。この「円盤を走らせる」動作は、効率の良い投てき動作を遂行させる上で重要であると指導現場では認識されているが、実際に競技力の高い円盤投競技者ほど「円盤を走らせている」のか、という疑問が生じる。そこで本研究では、「円盤を走らせる」動作に関連すると考えられるパラメータとパフォーマンスとの関係について明らかにすることを目的とした。国内一般レベルから世界トップレベルまでの記録を有する男子円盤投競技者62名(記録:38.05 – 68.94m)を対象に、競技会での投てき動作を撮影し、3次元動作分析を行った。円盤の速度について確認したところ、第一両脚支持局面の変化量および右足離地時点について、対象者全体で見た場合、投てき距離との間に有意な正の相関関係が認められた。しかし、競技レベルごとに見ると、世界トップレベル競技者12名については、有意な負の相関関係が認められたのに対して、国内競技者50名については、有意な正の相関関係が認められた。</p>

著者

山元 康平 広瀬 健一 前田 奎 大山 卞 圭悟 木越 清信 尾縣 貢

出版者

日本学生陸上競技連合

雑誌

陸上競技研究 (ISSN:09199918)

巻号頁・発行日

vol.2018, no.2, pp.11-20, 2018-06

著者

前田 奎 上田 美鈴 衛藤 昂 関 慶太郎 TheNguyen Hoang 山元 康平 廣瀬 健一 大山下 圭悟

出版者

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.65, pp.270-271, 2014