目的：本研究欲探討穿著不同鞋底硬度慢跑鞋對下肢運動學及肌肉活動的影響，以及交替穿著不同硬度後下肢的適應能力。方法：受試者為25位有運動習慣之20-33歲之間的男性跑者，其中13位擷取下肢運動學參數，另12位擷取下肢主要肌群的肌電訊號。受試鞋為硬度70C(硬)及45C(軟)，依不同穿著順序排列成組合A：A1(硬)-A2(軟)-A3(硬)及組合B：B1(軟)-B2(硬)-B3(軟)，組合分兩次(間隔一天以上)進行。肌電試驗部分為黏貼電極貼片(electrode)於右側股直肌、脛前肌、股二頭肌、股二頭肌及光標一顆於鞋跟後，依序穿著A1(B1)、A2(B2)及A3(B3)後於跑步機上收集60步資料。運動學試驗則黏貼光標五顆於右側股骨大轉子、脛骨外髁、外踝、鞋跟與前幫，依序穿著A1(B1)、A2(B2)及A3(B3)後於跑步機上收集28步資料。統計分析則以單因子重複量數變異數(one-way repeated measures ANOVA)分析將A1、A2、A3、B1、B2及B3六種不同情境下運動學參數結果及肌電訊號的差異。結果：穿著硬底慢跑鞋在著地前50ms會有較大的膝關節角速度、腳跟合速度、腳跟垂直方向速度；著地瞬間則是有較大的鞋底角度、較小的腳跟合速度及較大的腳跟左右方向速度；著地後50ms則是有較大的踝關節角度和膝關節角速度；著地後100ms有較大踝關節角速度及較小的腳跟垂直方向速度；交替穿著後發現，僅在穿著組合A(70C-45C-70C)的膝關節角度著地後達顯著差異，人體在此組合順序下可能需要利用改變膝關節角速度來進行調整適應。肌電訊號部分，不論是著地前後股直肌、脛前肌、股二頭肌及腓腸肌的活化程度及標準差皆沒有因為穿著不同硬度鞋底或交替穿著後達到顯著差異。結論:交替穿著不同鞋底硬度慢跑鞋下肢運動學參數會發生改變，此乃是人體對鞋底硬度造成地面衝擊力不同所作的動作調整；穿著硬底鞋時會受到前一雙軟底鞋的影響，而主要影響在於膝關節角速度的部分。不同受試者間可能採用不同肌肉調適機制，也就是選擇不同的肌群活化，來因應不同鞋底硬度所造成的衝擊效果，因而造成各肌群肌電訊號在統計結果沒有明顯差異。

Purpose: The purpose of this study was to investigate the influence of alternately using different midsole hardness on the kinematics and EMG (electromyography) of lower extremities. Methods: During capturing the kinematic data of thirteen volunteered subjects, five markers were placed on Greater trochanter, Lateral condyle of tibia, Lateral malleolus, heel counter and toe boxing. In another experiment, the EMG electrodes were placed on RF(muscle bellies of rectus femoris), LBF(muscle bellies of long head of biceps femoris), TA(muscle bellies of tibialis anterior) and GA(muscle bellies of gastrocnemius medialis) of twelve volunteered subjects. The tested shoes were custome-made by the FRT (Footwear & Recreation Technology Research Institute), including misole hardness of shore 70C and 45C. All participants were asked to wear the shoes in two ranking on the two different days, A: A1(70C)-A2(45C)-A3(70C) and B: B1(45C)-B2(70C)-B3(45C). One way repeated measures ANOVA was used to identify the differences between the six shoe conditions. Result: Under wearing hard-soled shoes, higer knee angular velocity, heel velocity and vertical heel velocity occurred at 50ms pre-heelstrike. Greater sole angle、horizontal heel velocity and smaller heel velocity were found at touchdown. Subjects performed greater ankle angle and knee angular velocity at 50ms post-heelstrike and greater ankle angular velocity and smaller vertical heel velocityat at 100ms post-heelstrike. In ranking A (70C-45C-70C), knee angular velocity were different significantly between A1 and A3 at 50ms post-heelstrike. While there were no significant differences for all the EMGs of the muscles in all shoe conditions. Conclusion: Based on the results, wearing the soft-soled shoe would affect the knee kinematics as wearing the hard-soled shoe again. However, this alternately wearing effect didn’t occur in ranking of soft-hard-soft. There were no significantly different EMG signals of the four muscles for the six shoe conditions because of the subject specific muscle tunning ability for different soles of hardness.

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