대퇴사두근 피로가 자세 조절의 복잡성에 미치는 영향
Effects of Quadriceps Femoris Fatigue on the Complexity of Postural Control
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본 연구의 목적은 대퇴사두근의 피로가 자세 조절에 미치는 영향을 알아보는 것이다. 연구 대상자는 10명의 건강한 성인 남성들로 구성하였다. 실험 과제는 우세측 하지에 근 피로를 유발하지 않은 조건(normal)과 근 피로를 유발한 조건(fatigue)에서 외발서기 자세로 30초간 최대한 정적 자세를 유지하는 것이었다. 근 피로 유발 운동은 fatigue 조건의 매 수행마다 진행되었으며실험 과제는 3회 반복 측정하였다. 근 피로 유발 운동 후, 좌-우(ML) 방향의 압력 중심(COP)의 표준편차(SD)와 속도(VEL)가증가함에 따라 자세 조절의 가변성이 증가하는 것으로 나타났다. 근 피로 유발 운동 후 ML 방향의 COP의 멀티-스케일 엔트로피 영역(MSE Area)이 감소하고 ML 방향의 COP 탈경향변동분석-지수(DFA(α))가 증가함에 따라 자세 조절의 복잡성은감소하는 것으로 나타났다. 근 피로에 따른 압력 중심의 복잡성 결과는 자세 조절의 가변성과는 다른 결과를 나타내며 기존 연구에서 제시되었던 단순한 움직임의 선형적인 정보뿐만 아니라, 자세 조절 시스템의 움직임 구조 등 비선형적인 정보를 제공한다. 본 연구는 근 피로와 자세 조절의 복잡성에 관한 후속 연구에 도움이 될 것으로 사료된다.
Abstract
The purpose of this study is to investigate the effect of quadriceps femoris fatigue on postural control. The study participants consisted of 10 healthy adult males. The experimental task involved maintaining a one-leg stance as statically as possible for 30 seconds on the dominant leg under conditions that did not induce quadriceps femoris fatigue (normal) and conditions that did induce quadriceps femoris fatigue (fatigue). Quadriceps femoris fatigue-inducing exercises were performed for each repetition under the fatigue condition, and the experimental task was measured three times. Following quadriceps femoris fatigue-inducing exercises, it was observed that the variability of postural control increased as the standard deviation (SD) and velocity (VEL) of the center of pressure (COP) in the medial-lateral (ML) direction increased. Moreover, it was found that the complexity of postural control decreased as the multi-scale entropy area (MSE Area) of COP in the ML direction decreased and as the detrended fluctuation analysis (DFA(α)) index of COP in the ML direction increased. The results regarding the complexity of the center of pressure following quadriceps femoris fatigue provide additional information beyond the variability of postural control, including non-linear information such as the movement structure of the postural control system, rather than simply linear information about simple movements as suggested in previous studies. This study is expected to contribute to subsequent research on the relationship between quadriceps femoris fatigue and postural control complexity.
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