野球の投手における「コントロール」のコツに関する一考察 ―技術の定立に向けて―

抄録

The purpose of this study is to determine the general movement technique for control in pitching, based on the analysis of the personal technique of individual “A”. As a first step, this study analyzes the execution of the “movement” and “mindset” behind them as performed by individual “A”. Next, it examines the adequacy and effectiveness of the “movement” and “mindset” while explaining how confidence in this method was achieved. As a result of this analysis, two effective methods of “movement” and “mindset”were achieved from individual “A”.

The first is the movement to leave the glove side arm when shifting the weight to the home base side to prevent “early torso rotation”. It was by chance during the match that “A” realized “early torso rotation” led to failure of “control”. After that, while focusing on preventing it and practicing repeatedly, “A” gradually became convinced that preventing “early torso rotation” was essential for “control”. In this process, “A” also noticed that the movement to leave the glove side arm when stepping to the home plate side is effective in order to accomplish this. Now, this is an essential movement for “A”.

The second is the movement to tilt the knee of the pivot leg towards the home base side, which is effective for increasing strength in the direction of home base to prevent “early torso rotation”. This is based on the “mindset” that if the strength toward the home base is weak when stepping forward, the pitcher will rely on the power of the upper body. Which will make “early torso rotation” more prone to occur. This “mindset” was also something that “A” realized through repeated trial and error, focusing on suppressing “early torso rotation”. “A” now firmly believes that it is effective to tilt the knee of the pivot leg to the home base side in order to increase the strength in the direction of home plate.