사이드 커팅 시 방향 예측 유무와 성별에 따른 신경근 조절 패턴 비교분석 연구

PURPOSEThis study aimed to identify the lower limb muscle activity based on direction prediction presence or absence and gender during side cutting in healthy college students.METHODS The study participants included 14 healthy males and females (8 males; 6 females).All participants ran at full speed for a distance of 12m, and side-cutting was carried out at 45 degrees in a randomly indicated direction and in a fixed direction.Simultaneously, data regarding vastus medialis, vastus lateralis, semitendinosus, and biceps femoris muscle activity of the dominant leg were collected using an electromyography sensor, and data regarding vertical acceleration were collected using an inertial sensor attached to the pelvis.A sync webcam was used for obtaining the initial contact of side cutting and the stance period time.During the 10 milliseconds (pre-activation) prior to the initial contact and 50% of the stance phase (loading phase), vastus medialis, vastus lateralis, semitendinosus, and biceps femoris average muscle activity and hamstring to quadriceps ratio included as variables.RESULTS During the pre-activation and loading phase, the vastus medialis muscle activity of the male group was higher in the unexpected condition than in the expected condition.Furthermore, hamstring to quadriceps ratio was confirmed to be lower under unexpected condition compared to under expected condition during on loading phase.CONCLUSIONS The study results suggest that the risk of anterior cruciate ligament injury may increase with side cutting under unpredictable conditions.It is expected to provide useful information for identifying factors related to knee injury in the general population.서론 서론 앞십자인대(Anterior cruciate ligament) 손상은 스포츠와 밀접한 관련이 있으며, 전체 앞십자인대 손상 중 약 70%가 갑작스러운 감 속과 방향전환이 요구되는 사이드 커팅(Side cutting)과 같은 비접 촉 조건에서 발생한다(Agel et al., 2005).특히, 여성 운동선수는 생 물학적 이유로 인해 남성 운동선수보다 앞십자인대 손상에 4배 이 상 취약한 것으로 확인된다(Arendt et al., 1999).앞십자인대 손상 메커니즘은 무릎이 완전히 신전된 상태에서 정강이뼈(Tibia)가 외 회전 또는 내회전 되어 강제로 외반이 붕괴되는 것으로 알려져 있 으며(LaBella et al., 2014; Olsen et al., 2004), 이러한 메커니즘 과 관련이 있는 것으로 확인되는 신경근 불균형(Neuromuscular imbalances) 중 넙다리네갈래근 우성(Quadriceps dominance)은 무릎 관절을 안정화시키기 위해 넙다리네갈래근(Quadriceps)에 우 선적으로 의존하는 확립된 이론으로 설명된다(Hewett et al., 2010;