過去關於直排輪的研究多著重於傷害的調查以及護具的使用上，但並無探討其傷害的機制。直排輪跳躍著地動作與雙腳急停跳躍著地相當類似，雙腳急停跳躍是在兩到三步的跨步助跑後，以雙腳著地後立刻起跳，跳至最高後再以雙腳著地。一般高處落下著地的研究指出膝關節彎曲，以及踝關節蹠屈在避震功能上扮演著相當重要的角色，但直排輪鞋限制了踝關節活動後，對於著地時下肢的運動學、地面反作用力以及肌肉活化上會產生何種影響則是未知的。因此，本研究目的為描述雙腳急停跳躍與直排輪跳躍著地的下肢動作特性，並比較踝關節受限後的影響。
本研究八位受試者需表現三種不同的跳躍著地：赤腳急停雙腳跳躍(BF)、限制踝關節的急停雙腳跳躍(AC)，以及穿著直排輪的跳躍著地(IS)。使用一台高速攝影機記錄人體在矢狀面上的動作，測力板與表面肌電儀則用來測量地面反作用力與下肢肌肉的活化情形。結果指出直排輪跳躍著地過程中，髖關節會有較大與較快速的彎曲，而膝關節則是較少與較慢的彎曲，這種著地策略主要在降低身體重心以維持動作穩定，但無法提供人體著地時的避震效果，因此若要減緩著地時的撞擊力直排輪鞋便扮演重要的角色。此外，踝關節因為被直排輪鞋所限制，因此踝關節明顯活動度較BF與AC小。肌肉活化上，在預備著地階段，IS的股直肌與脛前肌的活化較大，而腓腸肌活化則較BF與AC為小，而腿後肌群共同收縮比（股二頭肌/（股直肌+股二頭肌））較低，這樣的動作特性可能造成膝關節，尤其是前十字韌帶，較大的負荷而增加傷害的風險。因此，選用避震效果較佳的直排輪鞋，在表現跳躍著地時，可有效吸收地面的衝擊力。直排輪跳躍著地會有較大的髖關節活動與較小的膝關節活動，使著地更加穩定以減低發生跌倒傷害的機會。

Most of previous studies about in-line skating have focussed on the investigation of injury and the effect of using a guard. However, there have been no researches to study the mechanics of injury. In-line skating jump landing was similar to stop-jump landing. Stop-jump consists of a 2-3 steps approach run and a two-footed landing followed by two-footed takeoff to maximum height and two-footed landing again. However, no study has been involved to investigate the second two-footed landing after the takeoff. The studies of drop landing indicated that knee, ankle joints and plantarflexor played important roles in landing cushioning. In-line skating boots will constrain the motion of plantar-flexion, however, the influence of in-line skating boots on ground reaction force, kinematics, and muscle activation of lower limbs during landing has been unknown. Therefore, the purpose of this study tried to describe the movement characteristics of lower limbs during landing with stop-jump and in-line skating jump and compare the effect on lower limbs motion under ankle constrain.
Eight subjects were asked to perform three jump landing tasks: stop-jump with barefoot (BF), stop-jump with ankle constrain (AC) and jump with in-line skating boots (IS). Landing movements in sagittal plane were recorded by one high speed camera. One force plate and EMG system were used to measure the ground reaction force and the activation of four muscles during landing.
The results indicated that hip joint had more and quicker flexion, and the knee joint had less and slower flexion under IS. This landing strategy was used to lower the center of gravity of the body to keep the movement steadily, but could not absorb the shock during landing. Therefore, the in-line skating boots seems to play an important role to reduce the impact during landing. Because the ankle was constrained under IS, the range of motion was lower than BF and AC During pre-landing phase, the activation of rectus femoris and tibialis anterior was the largest under IS, but the activation of gastrocnemius was the lowest under IS, and the co-contraction ratio (biceps femoris/( biceps femoris+rectus femoris)) was also lowest. These characteristics might cause higher loading in knee joint, especially on anterior cruciate ligament, and increase the risk of injury. Therefore, the in-line skating boots with well cushioning could reduce the landing impact and reduce the falling injury while the human use the landing strategies to keep stability.

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