目的：棒球投手重複性投球動作及投球球數逐漸增加後，對於下肢肌群從跨步期階段到手臂加速期階段之肌肉活化程度及疲勞情形。方法： 12名健康高中棒球投手(16.3±0.9歲、177.8±5.68公分、71.3±8.3公斤)，各投100顆球(分5局，每局投20顆)，以Noraxon無線肌電儀器(擷取頻率1500Hz)收取投手下肢肌群(股直肌、股內側肌、股外側肌、脛前肌、臀大肌、肌二頭肌、外腓腸肌)前(第1顆至第10顆)、中(第46顆至第55顆)、後(第91顆至第100顆)三個區段平均肌電振幅與中位頻率平均值，並同步利用高速攝影機(擷取頻率300Hz)取得投手投球過程中下肢動作運動學參數作為參考數據。以重複量數單因子變異數分析(One-way ANOVA with repeated measures)進行統計分析。統計顯著水準定為α=.05。結果：投手下肢肌群從跨步期到手臂加速期階段於前中後三個區段出現明顯活化程度，其中以手臂加速期前導腳肌群活化程度最為明顯；同時前導腳外腓腸肌中位頻率值在前(100.4Hz)、中(94.80 Hz)、後(90.65 Hz)三個區段隨投球數增加而降低。結論：投手經過持續且重覆投球動作後，前導腳外腓腸肌會有疲勞現象。

Purpose: To evaluate the muscle activation and fatigue conditions of the lower limbs from stride phase to arm acceleration phase after repeatedly pitching. Methods: The study recruited 12 healthy high school baseball pitchers (16.3 ± 0.9 years, 177.8 ± 5.68 cm, 71.3 ± 8.3 kg), were asked to pitch 100 balls (five set, 20 per innings pitched). The Noraxon wireless EMG devices (acquisition frequency 1500Hz) combined with high speed camera (capture frequency 300Hz) were used to captures and record the muscle activation and movement during pitching. The average of EMG amplitude and median frequency during the first (1-10 ), medium (46-55), and lest 10 balls pitching were calculated. The kinematic of lower limbs during pitching were also founded. One-way ANOVA with repeated measures was used to statistics. The significant level was set as α=.05. Results: The muscles of lower limbs were activated from the stride period to the arm acceleration phase, especially the muscle activation of the leading foot in the arm accelerated phase. The median frequency of the gastrocnemius were decreased while the number of pitching were increased (first:100.4Hz, medium:94.80 Hz, lest:90.65 Hz). Conclusions: After 100 pitches, the muscle fatigue was noted in the gastrocnemius in this study.

一、中文部份
王令儀（2006）。高、低表現蹲踞跳之運動生物力學與肌電圖研究。體育學報，39(4)，63-74。
王進華（2007）。不同籃球動作之膝控制肌群肌肉活化特性之探討。大專體育學刊，9(1)，91-102。
林正常（1996）。運動生理學實驗指引。台北市：師大書苑
林政東、陳全壽、劉宇、趙峻郁（2000）。兩種不同牽張幅度深跳練習的二階段肌電現象之比較。體育學報，28，329-338。
林俊龍（2006）。棒球投手練習過程的下肢動作協調。未出版之碩士論文，國立臺灣體育學院競技運動研究所，台中市。
吳忠芳（2008）。橢圓機坡度改變對下肢肌群肌電訊號與生理反應之影響。體育學報，41(2)，31-42。
念裕祥（2009）。太極拳訓練對下肢肌力、本體感覺、平衡能力及步態肌電之影響研究。未出版之博士論文，國立臺灣體育大學，桃園縣。
洪玉山（2008）。棒球投手不同跨步距離之生物力學分析。未出版碩士論文，國立臺北教育大學，台北市。
徐文淵（2009）。自行車不同座椅高度對騎乘效率及下肢肌電訊號之影響。出版碩士論文，國立體育大學，桃園縣。
莊林貴、陳九州、陳志中、鄭鴻文、官文炎（2000）。青棒投手不同投球法之投球速度與下肢等速肌力的相關性之研究。北體學報，7，159-166。
黃勝裕 (2000)。肌肉週邊疲勞之肌電圖判定。中華體育，14 (1)，109-115。
曾國維、陳書芸、吳若萍、賴文沁、王愛婷（2008）。中國舞蹈後踢腿肌電圖分析。北體學報，16，205-214。
陳書瑋 (2009)。不同型態投法之優秀棒球投手的球速、肌肉量、運動學與動力學特徵分析。未出版之碩士論文，國立臺灣體育大學教練研究所，桃園縣。
葉志仙(1998) 棒球運動防守技術與戰術 中華少年棒球聯盟 非賣品
蔡宗晏、林勁帆（2007）。單次不同負荷重量訓練之複合訓練模式對隨後增強式跳躍表現與肌肉活化的影響。大專體育，9(3)，107-116。
劉玉仁、周有禮、羅世忠（2002）。高爾夫揮桿動作中下桿啟動之下肢肌電訊號分析。體育學報，33，65-74。

二、英文部份
Brian, M. C., David, F. S., ＆ Megan, K. N. (2010). Lower extremity muscle activation during baseball pitching. Journal of Strength and Conditioning Research, 24(4), 964-971
Chen, W. Y., Balmos, T., Wang, W. T. J., Olson, S., ＆ Hanten, W. P. (1997). Comparison of intial median frequency values formulated by two different methods. Journal of Clinical Electrophysiology, 9 (1), 2-6.
De Luca, C. J. (1997). The use of surface electromyography in biomechanics. Journal of Applied Biomechanics, 13(2). 135-163.
Elliott, B., Grove, J. R., ＆ Gibson, B. (1988). Timing of the lower limb drive and throwing limb movement in baseball pitching. International Journal of Sport Biomechanics, 4, 59-67.
Fleisig, G. S., Barrentine, S. W., Escamilla, R. F., & Andrews, J. R. (1996). Biomechanics of overhand throwing with implications for injuries. Sports Medicine, 21, 421-437.
Fleisig, G. S., Barrentine, S. W., Zheng, N., Escamilla, R. F., ＆ Andrews, J. R. (1999). Kinematics and kinetic comparison of baseball pitching among various leves of development. Journal of Biomechanics, 32, 1371-1375.
Jacobs, P. (1987). The overhand baseball pitch. A kinesiological analysis and related strength-conditioning programming. NSCA Jouenal, 9(1). 5-13, 78-79
Lynn, S. M. (1996). Scientific rationale and physiological basis for the use of closed kinetic chain exercise in the lower extremity. Journal of Sport Rehabilitation, 5, 2-12.
MacWilliams, B. A., Choi. T., Perezoijs, K. M., Chao, S. F., ＆ MacFarland, G. E. (1998). Characteristic ground-reactoin force in baseball pitching. American Journal of Sport Medicine, 26, 66-71.
Matsuo, T., Escamilla, R. F., Fleisig, G. S., Barrentine, S. W., ＆ Andrews, J. R.(2001). Comparison of kinematic and temporal parameters between different pitch velocity groups. Journal of Applied Biomechanics, 17, 1-13.
Madigan, M. L., & Pidcoe, P. E. (2003). Changes in landing biomechanics during a fatiguing landing activity. Journal of Electromyography andKinesiology, 13(5), 491-498
Pappas, A. M., Zawacki, R. M., & Sullivan, T. J. (1985). Biomechanics of baseball pitching. American Journal of Sports Medicine, 13, 216-222.
Walk, W., Clark, M. A., ＆ Seefeldt, V. (1996). Baseball and Softball. In D. J. Caine, C. G. Caine, ＆ K. J. Linde (Eds.), Epidemology of sports injuries (pp. 100-125). Champaign, IL:Human Kinetics