著者

小倉 圭 川村 卓 金堀 哲也 野本 尭希 八木 快 小野寺 和也

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.62, no.2, pp.511-522, 2017 (Released:2017-12-19)

参考文献数

25

---

The purpose of this study was to clarify the types of step adjustment performed by baseball infielders for catching a grounder in relation to skill level. The subjects were 18 amateur baseball infielders, whose fielding motions were videotaped using 2 high-speed video cameras (300 Hz). The 3-dimensional coordinates of both the toes and the ball were obtained using the DLT method. The top 9 subjects who showed small variations in the grounding point of both feet when adopting the catching posture were defined as a high-performance group, and the bottom 9 subjects were defined as an intermediate-performance group. The results obtained were as follows:  1) Baseball infielders modified each grounding point from 4 steps to 1 step before catching in order to acquire the most appropriate catching point, and the final step was highly reproducible.  2) The high-performance group showed a significantly smaller standard deviation in the 1 step before the grounding point than the intermediate-performance group.  3) In the high-performance group, there was a positive correlation between the standard deviation of step length 1 step before and the standard deviation of the grounding point from 5 steps to 2 steps before.  These results suggest it is important to reduce variations in the grounding point 1 step before by earlier perception of the error in the front-to-rear direction of the grounding point. These results could provide important insight for coaches or trainers attempting to improve the performance of infielders when catching a grounder.

著者

野本 尭希 小倉 圭 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.103-114, 2021-10-20 (Released:2021-12-28)

参考文献数

30

---

The purposes of this study were to gain knowledge to improve individual tactics through how players acquire practical wisdom by focusing on experience and reflection while providing narrative cases on practical wisdom of individual tactics of baseball batting. We conducted an interview with one college baseball player. After reviewing the case, we found the following contents.     1) By repeatedly conducting the process to collect failure cases from game experiences and then applying the lessons of failure to the next playing opportunity, the player will be able to update his playing image immediately during the game. Thus, it is required that the objective of learning is to promote the above-mentioned process by reflecting on failure experiences.     2) With the corrective intention of technical skills, a player becomes aware of needs for a series of processes to achieve a stable technical capability such as realization of change in skill, cause assessment, and selection for correction method. Thus, it is required that the objective of learning is to identify where the issue lies in the series of processes.     3) By aiming to play against and conquer pitchers with individual tactics as a player never experienced before, the player attempts to acquire new tactical variations and the necessary technical skills. Thus, for obtaining new variations of individual tactics, it is recommended that players need to gain more experiences to play against pitchers with individual tactics as never experienced before.