著者

桑田 真澄 川名 光太郎 間仁田 康祐 平田 竹男

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.20, no.1, pp.91-95, 2010 (Released:2010-06-07)

被引用文献数

1

---

The purpose of this study was to reveal how professional baseball players were trained while they were amateur baseball players, and to examine ways to improve the problems faced by amateur baseball players. A survey of 300 professional baseball players was conducted.    There were a lot of problems revealed in amateur baseball: “overwork and injury because of irrational, inefficient, and too long training” , “manner of the instructors” , “balance among baseball, studying, and playing” , and “violence to the players” . These results suggested that most professional baseball players wanted it to be done in a different way from their own experience, and that they had a strong awareness of the problems of traditional training.

著者

桑田 真澄 川名 光太郎 間仁田 康祐 平田 竹男

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.20, no.1, pp.91-95, 2010

---

The purpose of this study was to reveal how professional baseball players were trained while they were amateur baseball players, and to examine ways to improve the problems faced by amateur baseball players. A survey of 300 professional baseball players was conducted.<BR>    There were a lot of problems revealed in amateur baseball: "overwork and injury because of irrational, inefficient, and too long training" , "manner of the instructors" , "balance among baseball, studying, and playing" , and "violence to the players" . These results suggested that most professional baseball players wanted it to be done in a different way from their own experience, and that they had a strong awareness of the problems of traditional training.

著者

草深 あやね 小林 裕央 三木 豪 桑田 真澄 工藤 和俊 中澤 公孝 若尾 真治

出版者

一般社団法人 日本機械学会

雑誌

シンポジウム: スポーツ・アンド・ヒューマン・ダイナミクス講演論文集 2018 (ISSN:24329509)

巻号頁・発行日

pp.A-32, 2018 (Released:2019-05-25)

---

The purpose of this study was to verify the precision of different simulation methods to extrapolate vertical pitch location with the use of some dynamic parameters at ball release measured by TrackMan, and to determine dynamic parameters to predict pitch location. Ball trajectory was calculated by the equation of motion with three different numerical analysis methods (Euler, Runge-Kutta, Dormand Prince) and the vertical pitch location was compared with the measured values. The total number of pitches was 137 pitches. Dormand Prince method showed the smallest errors (5.8 ± 1.4 cm) compared with Euler (6.8 ± 1.4 cm) and Runge-Kutta (6.7 ± 1.4 cm) methods, indicating Dormand Prince was the highest precision method to extrapolate pitch location, but all methods could extrapolate it below the size of ball. Simulation with Dormand Prince method and multiple regression analysis revealed that elevation pitching angle and ball velocity more predicted vertical pitch location rather than other parameters. Furthermore, regression equation structured by these parameters could predict the pitch location with error by less than 10.0 cm (9.5 cm). These results indicate that the elevation pitching angle and ball velocity, i.e. velocity vector of ball, affected the determination of pitching location.