摘要
研究目的：透過穿著不同釘數的釘鞋，以探討大專公開二級棒球投手穿著釘鞋的平衡、球速、好球率與各分期肌肉活化的差異。研究方法：實驗參與者為7名大專公開二級棒球投手，分別穿著9爪釘、7爪釘、7爪釘與6爪釘進行投球，每款鞋子各投20球，並透過無線表面肌電儀（Delsys, free EMG)蒐集投球時下肢的肌電訊號。統計方法：以重複樣本次序變數的無母數統計方法分析(Friedman Test)，進行投球時釘鞋與平衡、球速、好球率與各分期肌肉活化之比較。研究結果：4種鞋款對於左右腳的平衡能力未達顯著差異；對於球速與好球率也未達顯著差異；在投球動作分期當中，4款鞋的肌肉活化在手臂上舉期時，軸心腳的股直肌達顯著差異(p=.002)，手臂加速期軸心腳的股外側肌達顯著差異(p=.002)，手臂減速期軸心腳的股外側肌及自由腳的股直肌達顯著差異(p=.001；p=.003)，跟隨期軸心腳的股外側肌、自由腳的股外側肌達顯著差異(p=.001；p=.001)，自由腳的股直肌與脛前肌也達顯著差異 (p=.001；p=.003)。結論：研究結果顯示，投球動作因人而異，釘鞋的影響在短局數中效果可能不明顯，足跟區只有1釘的釘鞋肌電訊號偏小，導致不好發力，對於投球的運動表現無法增加效益。
關鍵詞：下肢、平衡、投手丘、肌電訊號

Abstract

Objective: We aimed to explore the differences in balance, velocity, strike rate and muscle activation of baseball pitchers wearing different spiked shoes. Methods: The experimental participants were 7 baseball pitchers, wearing 9-spiked, 7-spiked, 7-spiked, and 6-spiked shoes. Each participant pitched 20 trials with different types. During pitching, the wireless electromyography (Delsys) was used to collect the EMG signals of the lower limbs. Statistical method: The Friedman test was performed for a repeated measures to determine if different spiked shoes had effects on balance, velocity, strike rate, and muscle activation. Results: The balance of both feet did not have a significant difference, while velocity and strike rate were not significant either. As for muscle activation, the rectus femoris of the pivot leg was significantly different (p=.002) during arm raising. Moreover, the vastus lateralis of the pivot leg was significantly different (p=.002) during arm acceleration, while the vastus lateralis muscle activation of the pivot leg and the rectus femoris muscle activation of the free leg were significantly different (p=.001; p=.003) during arm deceleration. During the follow through, the vastus lateralis of the pivot leg and the vastus lateralis of the free leg were significantly different (p=.001; p=.001). Conclusion: Our results indicated that the pitching motions varied, and the effect of spiked shoes might not be significant for short innings. The EMG signal with only one spike in the heel area might be weak, resulting in an unremarkable performance.
Key words: Lower Limbs, Balance, Pitcher Mound, EMG

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