壘球風車式投球不同擺臂技術之運動生物力學分析

Biomechanical Analysis of Two Kinds of Arm Techniques during Softball Pitching Using the Windmill Style

王令儀(Li-I Wang) ； 林德嘉(Der-Chia Lin) ； 黃長福(Chen-Fu Huang) ； 杜惠萍(Hui-Ping Tu)

《體育學報》 35期 (2003/09) Pp. 49-57

https://doi.org/10.6222/pej.0035.200309.2405

摘要

The purpose of this study was to investigate the differences between two kinds of softball pitching techniques that involve pitching the arm backward. Two high skilled female fastpitch softball pitchers served as subjects. Two high-speed video cameras (120 frames/s) were synchronized to collect the arm motions during softball pitching. Angular momentum of the pitching arm was then calculated from these kinematic data and from the moment of inertia of the arm. The results indicated that the first-peak velocity (elbow: straight-arm backward style 5.95m/s＞curve-arm backward style 5.19m/s; wrist: straight-arm backward style 9.38m/s＞ curve-arm backward style 5.88m/s), moment of inertia(left leg landing: straight-arm backward style 0.34kg*m2＞curve-arm backward style 0.17kp*m2), and angular momentum (left leg landing: straight-arm backward style 3.92kg*m2/s＞curve-arm backward style 0.17kg*m22.11kg*m2/s)were larger for the straight-arm backward style during the preparation stage and of the transmission stage. It is suggested that the pitchers need to have better muscle endurance for the straight-arm backward style. However, the pitchers must have more muscle power and coordination for the curve-arm backward style.

關鍵字

壘球 ； 直臂式後擺投球 ； 屈肘式後擺投球 ； 運動生物力學

並列摘要

The purpose of this study was to investigate the differences between two kinds of softball pitching techniques that involve pitching the arm backward. Two high skilled female fastpitch softball pitchers served as subjects. Two high-speed video cameras (120 frames/s) were synchronized to collect the arm motions during softball pitching. Angular momentum of the pitching arm was then calculated from these kinematic data and from the moment of inertia of the arm. The results indicated that the first-peak velocity (elbow: straight-arm backward style 5.95m/s＞curve-arm backward style 5.19m/s; wrist: straight-arm backward style 9.38m/s＞ curve-arm backward style 5.88m/s), moment of inertia(left leg landing: straight-arm backward style 0.34kg*m2＞curve-arm backward style 0.17kp*m2), and angular momentum (left leg landing: straight-arm backward style 3.92kg*m2/s＞curve-arm backward style 0.17kg*m22.11kg*m2/s)were larger for the straight-arm backward style during the preparation stage and of the transmission stage. It is suggested that the pitchers need to have better muscle endurance for the straight-arm backward style. However, the pitchers must have more muscle power and coordination for the curve-arm backward style.

並列關鍵字

softball ； straight-arm backward pitch ； curve-arm backward pitch ； biomechanics

參考文獻

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王令儀、杜惠萍、林德嘉、黃長福(2001)。壘球投手跨步腳著地期間下肢關節之動力學分析。體育學報。31

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