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탄성 발목 보호대 착용 유무가 전방 점프 착지 시 하지 관절의 역학적 변인 차이 비교

Kinetic Variables of Lower-Extremity Joint during Forward Jump Landing With Versus Without Elastic Ankle Strap

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초록

[목적] 본 연구의 목적은 발목 보호대 착용이 전방 점프 착지 동안 하지 관절의 운동학적 및 운동역학적 변인에 미치는영향을 조사하는 것이었다. [방법] 건강한 성인 남성 12명이 본 연구에 참여하였으며, 힘판으로부터 신장의 40% 수평거리에 맨발로 서서, 발목 보호대 착용 또는 미착용 상태에서 30 cm의 장애물을 넘어 우성 하지 또는 비우성 하지로 전방 점프 착지를 수행하였다. 이때 발생하는 관절 각도, 최대 수직 지면반력, 부하율, 하지 강성을 분석에 사용하였으며, 양쪽 하지에서 발목 보호대착용 전, 후 운동역학적 차이 및 주효과와 상호작용을 살펴보기 위해 이원 분산분석을 실시한 후 본페로니 사후검정을사용하였다. 모든 통계적 유의수준은 α=.05 미만으로 설정하였다. [결과] 발목 보호대 착용 전, 우성 하지와 비우성 하지 간 운동학적 변인에서 유의한 차이가 나타났다. 발목 보호대 착용 후, 양쪽 하지의 발목관절에서 내번 각도가 유의하게 감소하였으며, 발목관절의 내회전 각도에서 양쪽 하지와 발목보호대 간 상호작용이 발생하였다. 운동역학적 변인에서는 차이가 없었다. [결론] 발목 보호대 착용 후 비우성 하지의 발목 불안정성을 완벽하게 보완해주지는 않았으나, 발목 관절에서 내회전각도를 유의하게 감소시켜 주었다. 이는 발목 보호대가 외측 발목 염좌 발생 가능성을 어느 정도 감소시켜줄 수 있음을시사한다.

Abstract

PURPOSE This study aimed to investigate the effect of an ankle strap on kinetic variables of the lower limb during forward jump landing. METHODS Twelve healthy adult men (mean age, 23.58±2.22 years; mean height, 177.83±5.37 cm; mean weight, 75.00±7.72 kg) participated. The participants stood barefoot on both legs at a horizontal distance of 40% of their body height from the center of the force plate, then jumped forward and landed on the force plate with their dominant or non-dominant leg over a 30-cm hurdle while wearing or not wearing an ankle strap. Joint angle, peak vertical force, loading rate, and leg stiffness were calculated. Paired t-test and repeated-measures two-way analysis of variance with Bonferroni’s post hoc tests were used to compare the characteristics of both lower limbs and the effect of wearing an ankle strap. The significance level was α < .05 RESULTS Our results showed significant differences in kinematic variables between the dominant and non-dominant legs without the ankle strap. With the ankle strap, the inversion angles at the ankle joints of both lower extremities were significantly decreased, and an interaction effect between both legs and the ankle strap occurred in the internal rotation angle of the ankle joint. Kinetic variables did not differ significantly. CONCLUSIONS The ankle strap did not completely compensate for ankle instability in the non-dominant leg, but it significantly reduced the angle of internal rotation at the ankle joint. Thus, we recommend that correct wearing of the ankle strap in sports since it reduces the possibility of lateral ankle sprains to some extent.

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