壘球風車式投球下肢肌電分析

Softball Windmill Pitch Lower Extremity EMG Analysis

曾偉銘(Wei-Ming Tseng) ； 張家豪(Jia-Hao Chang)

《大專體育學術專刊》 97年度 (2008/05) Pp. 608-611

https://doi.org/10.6695/AUES.200805_97.0088

摘要

壘球投手下肢的角色是帶動身體重心的移動進而影響上肢，使球產生球速投出，因此下肢可謂是投球動力的來源。目的：探討風車式壘球下肢的肌電參數，比較直球與上飄球的差異。方法：利用德國Biovision生物訊號擷取系統收測五位甲組的女子快速壘球投手的下肢肌群（雙腳的股直肌、股二頭肌、脛骨前肌以及腓腸肌）活化順序與特性。結果：肌肉活化值在傳輸期時右側的肌群活化值大於左側，在加速期時則是左側的活化值較大。結論：每個參與者在肌群活化順序並無一定的規律性，希望日後增加樣本數後可以從中發現；直球與上飄球間的活化值並無差異；傳輸期時因為動作著重在右側的推蹬腳上，此時應將比重放於推蹬腳上，在跨步腳著地後，此時加速期為了使球加速投出，跨步腳的肌群需要維持用力固定身體，將球投出。

關鍵字

直球 ； 上飄球 ； 肌肉活化順序

並列摘要

The lower extremity as origin of the pitching power leads gravity of body move and makes upper extremity speed up to throw the ball. Therefore, we want to investigate the muscle firing pattern and activation characteristics during windmill pitching, and analyze the difference between different types of pitch. Purpose: To observe the EMG parameters of lower extremity during windmill pitching. Methods: Biovision system (Frequency: 1000Hz) was used to collect EMG data (rectus femoris, biceps femoris, tibialis anterior, and gastrocnemius muscle of both of legs) of five female softball windmill pitchers during throwing straight ball and rise ball. Results: muscles activations of right side during delivery period were bigger than left side, and left side took advantage when in the acceleration period. Conclusion: There were no regularities in muscle firing pattern when participants pitching. We suggested that pitchers should put more attention on right side push-leg during delivery period and stride-leg in the acceleration period.

並列關鍵字

straight ball ； rise ball ； muscle firing pattern