earticle

영어

The purpose of this study was to investigate the factors related to ankle movements when unstable functional movements of the lower limb are repeated. Besides, we want to find out the difference in muscle activity when the motor control changes during the gait. In this study, the Y-Balance Test(YBT) was performed. Anterior categorization of functional disturbances in 25 patients with a difference of more than 4cm between the left and right of the Anterior reach distance(ARD) or a composite reach distance(CRD) of 89% or less. The correlation coefficient of ARD with IC (isometric contraction) was 0.477, and the correlation coefficient of ARD with ROM in the ankle was 0.754, which showed a statistically significant correlation(p<.05), (p<.001). The correlation coefficient of CRD with IC was 0.570, and the correlation with ROM in the ankle was 0.662, which was statistically significant correlations(p<.05), (p<.001). The functional instability of the lower limb was classified ARD, CRD(Normal, Unilateral, Bilateral), and the magnitude of muscle activity during the gait was examined. The Mann-Whitney U test with a 4cm difference of ARD showed a significant difference only in the right MG (medial gastrocnemius) muscle(p<.05). The Kruskal Wallis test results showed that the left LG (lateral gastrocnemius), the left MG, and the right MG muscles were statistically different according to the functional instability classifications, respectively (p<.05), (p<.05), (p<.05). To improve functional movement, it seems necessary to increase the efficiency of muscle use through motor control training with the control of the fatigue of the involved muscles.

한국어

이 연구의 목적은 하지 관절의 기능적 불안정 움직임이 반복될 때, 발목 움직임과 관련된 요인을 확인하고자 수행 되었다. 또한, 운동조절이 변화한 경우 보행 중 근활성도 차이가 발생하는지를 검증하고자 하였다. 본 연구에서, Y-balance test를 활용하여 피험자 25명을 평가하였으며, 통계 분석 방법은 피어슨 상관분석과 Mann-Whitney U, Kruskal Wallis test를 사용하였다. 하지관절의 기능적 움직임 수준은 좌우 하지의 전방도달거리(ARD: Anterior reach distance) 차이와 총 도달거리(CRD: Composite reach distance)의 89% 기준으로 구분하였다. ARD 상관성 분석에서 는 근수축력(.477)과 관절가동범위(.754), CRD 상관성 분석에서는 근수축력(.570)과 관절가동범위(.662) 로 각각 유의한 차이가 나타났다(p<.05),(p<0.001),(p<.05),(p<0.001). 보행 중 ARD 그룹의 근활성도(mV)는 오른발 안쪽 장딴지근(Medial gastrocnemius: MG)에서 ARD(≧4cm)그룹 16.94±6.14에 비해 ARD(<4cm)그룹 24.61± 8.85 로 근활성도 차이가 유의하게 나타났다(p<.05). 보행 중 CRD 그룹의 근활성도(mV)는 정상보다 오른발은 MG에서, 왼발 은 MG와 LG(Lateral gastrocnemius)에서 높은 근활성도가 각각 나타났다(p<.05),(p<.05),(p<.05). 기능적 움직임 개선을 위해서는 관련된 근육의 피로도 조절과 함께 근육 효율성 증가를 위한 움직임 조절 훈련이 필요하다.