Kinematics and Muscle Activity of Lower Extremity during Single Leg Jump Landing in Soccer Players with Functional Ankle Instability

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  • 足関節機能的不安定性を有するサッカー選手の片脚着地時における下肢キネマティクスと筋活動
  • アシカンセツ キノウテキ フアンテイセイ オ ユウスル サッカー センシュ ノ カタ キャク チャクチジ ニ オケル カシ キネマティクス ト キン カツドウ

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<p>The purpose of this study was to investigate the characteristics of joint movements and muscle activities of the subjects who have functional ankle instability (FI) during single leg landing. 12 high school soccer players participated in the study. They were classified into two groups based on the presence or absence of FI. Subjects performed forward and lateral single leg jump landing. During these tasks, muscle activities of gluteus maximus (GMax), gluteus medius (GMed), adductor longus (AL), rectus femoris (RF), gastrocnemius medialis (GM), peroneus longus (PL) and tibialis anterior (TA) were measured via electromyography. Joint motions were also recorded through high-speed video cameras and analyzed by the motion analysis software. The subjects with FI demonstrated significant delays of PL and GMed muscle reaction time during the lateral landing. Similarly, the degree of knee valgus was greater in the subjects with FI than that of the subjects without FI during the same movement task. No difference in %MVC was observed between the groups. These results showed that the subjects with FI have dysfunctions of hip and knee as well as ankle joints. The functional impairments around these joints could contribute to the risk of ankle sprains.</p>

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