本研究目的為探討穿著不同鞋墊執行不同切入角度之截擊動作並側向回防時，下肢關節之生物力學化情形。實驗對象為六位網球運動員，近半年無下肢傷害且自願參與實驗。整個實驗過程為受試者右手持拍且穿著兩款鞋墊執行三種角度切入動作（0°、30° 與 60°），並且需作網球正手截擊動作，在擊球後立即側向並步回防。受試者穿著相同品牌、型號大小的網球鞋(型號: Adidas 012508, size US: 9.5)做此實驗動作，除原有鞋之鞋墊外，另外更換置入在前腳掌位置貼上黏性魔鬼氈之鞋墊，並穿著特殊的襪子以增加足底與鞋墊之間的摩擦力。此實驗利用一塊力板 (1000Hz, Kistler Type9281B) 與八台攝影機 (200Hz, HiRES Motion Analysis Corp., Santa, Rosa, CA, US) ，同步擷取受試者穿著兩種不同鞋墊執行三種切入動作時的運動學與動力學的資料。結果發現膝關節及初期階段的踝關節運動學參數上均無顯著差異，此可能是因為初期階段屬於任務導向的動作（必須成功擊球），因此造成受試者間調整機制不同。此外，在初期階段穿著黏性鞋墊執行 0° 切入動作有較高的左右與垂直方向地面反作用力，因此增加了初期階段的急停能力。在後期階段方面，穿著一般鞋墊執行 60° 切入有較大的踝關節外翻 (eversion) 與蹠屈 (plantar flexion) 角度和角速度，此現象可能與造成足部肌腱、韌帶受傷有關。穿著黏性鞋墊的運動學參數則無隨著切入角度增加而有所變化，而且穿著黏性鞋墊執行 60° 切入的外翻角度與角速度以及蹠屈角度角速度比一般鞋墊小，因此穿著黏性鞋墊增加在不同切入時的踝關節穩定度外，相對減小較大切入所造成的下肢傷害。由本研究結果可知，網球下肢的高傷害率應與後期推蹬動作有關，穿著減小腳在鞋子內滑動的鞋子應可以降低下肢傷害。

The purpose of this study is to investigate effect of foot insole on lower extremities biomechanics during the cutting movement of forehand volley in tennis. Six male tennis players without history of lower limb injury volunteered for this investigation. Subjects perform three cutting angles movements (0°, 30° & 60°) to hit a dropping ball with a racket. Subjects are asked to wear a tennis shoe (Adidas 012508, size US: 9.5) under two conditions: with its insole and an adhesive insole. Eight-cameras vedio system (Motion Analysis Corp., Santa, Rosa, CA, US) was used to collect the data (different condition in cutting angles and insole) of 3D kinematics. One force platform (Kitsler, Type 9281B, 1000Hz) was used to determine the ground reaction force (GRF). During the experiment, both the motion analysis system and the Kitsler’s force platform are activated at the same time. The result shows that there is no significant difference in the kinematics parameters of the ankle during early stance. Because the movement during early stance is belong to a task-oriented skill, which would lead to different modifications by the subjects. Highest medio-lateral and vertical forces occurred while performing 0° cutting angle with adhesive insole, that increases the stop ability during early stance. The eversion angle, and angular velocity, plantarflexion angle and angular velocity increase with an increase in cutting angle with normal insole during late stance. According to the results, the subjects perform higher cutting angle with normal insole seem to have higher chance to get Achilles tendon injury. The risk factors of adhesive insole with 60° cutting angle are smaller than normal insole. Therefore, the subjects perform 60° cutting angle with adhesive insole has more ankle stability than normal insole during the late stance. Most tennis injuries in lower extremity seem to be caused by push-off during the late stance, and the reduction of foot slipping inside the shoe would improve the ankle stability.

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