여성 발레전공자의 정적 하지 정렬 비교 분석 : 비대칭과 발의 역할을 중점으로
Comparison of Static Lower Extremity Alignment in Female Ballet Dancers and Non-ballet Dancer
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[목적] 본 연구는 여성 발레전공자와 비전공자 간 정적 하지 정렬(static lower-extremity alignment, SLEA)을 비교하고, SLEA의 비대칭과 발의 역할에 따른 SLEA를 확인하고자 수행되었다. [방법] 최근 3개월 간 부상이 없는 만 20, 30대 여성 발레전공자 29명과 일반인 20명을 대상으로 quadriceps (Q-angle, Q각), tibiofemoral(TF-angle, 대퇴경골각), rearfoot(RF angle, 후족각), genu-recurvatum(GR angle, 후반슬)의 각, tibial torsion(경골 회전각) 및 varum(안쪽굽음), navicular drop(ND, 발배뼈 하강 높이)을 측정하였다. 그룹 간 SLEA의 차이와 비대칭 정도를 비교하기 위해 독립 표본 t 검정을 실시하였다. 표현하는 다리(gesture leg, GL) 및 지지하는 다리(supporting leg, SL)와 일반인의 우세다리 간 SLEA의 차이를 확인하기 위해 일원배치 분산분석및 Bonferroni 사후 검정을 실시하였다. [결과] 발레전공자는 비전공자에 비해 적은 quadriceps angle(Q각), rearfoot angle(후족각), tibial varum(안쪽굽음) 및 navicular drop(발배뼈 하강 높이)를 보였으며, 큰 tibiofemoral angle (대퇴경골각)이 나타났다(p <.005). 또한, 발레전공자는 일반인에 비해 Q각의 비대칭은 적었으나, 큰 경골 회전각의 비대칭이 나타났다(p <.01). 발레전공자의GL과 SL은 일반인의 주발과 비교하여 quadriceps angle (Q각), tibiofemoral (대퇴경골각), rearfoot angle (후족각), tibial torsion(경골 회전각) 그리고 navicular drop height (발배뼈 하강 높이)에서 차이가 나타났다. [결론] 반복적인 무용 움직임은 GL과 SL에 서로 다른 부하를 전달할 수 있으며, 이는 SLEA의 불균형에 기여할 수 있다. 발레전공자의 SLEA 비대칭성을 줄일 수 있는 중재전략을 필요하며, 올바른 SLEA를 유지하는데 기여하는 발레 훈련의요소를 확인할 필요가 있다.
Abstract
PURPOSE This study aimed to: 1) compare the differences in static lower-extremity alignment (SLEA) between female ballet dancers (BD) and non-ballet dancers (NBD); 2) investigate the differences among gesture leg (GL) and supporting leg (SL) in BD and dominant leg (DL) in NBD; and 3) compare limb asymmetry between groups. METHODS Twenty-nine female BD and 20 NBD were recruited for this study. The quadriceps, tibiofemoral, rearfoot, and genu-recurvatum angles, tibial torsion and varum, and navicular drop height were measured. An independent t-test was conducted to compare SLEA and limb asymmetry between groups. One-way analysis of variance with Bonferroni post-hoc tests were performed to determine the differences among the GL, SL and DL. RESULTS BD showed lower quadriceps and rearfoot angles, less tibial varum and navicular drop, and greater tibiofemoral angle (p <.005) than NBD. BD showed less quadriceps angle asymmetry but greater tibial torsion asymmetry (p <.01) than NBD. GL and SL in BD showed differences in quadriceps, tibiofemoral, rearfoot angle, tibial torsion and navicular drop compared to NBD. CONCLUSIONS Repetitive dance movements can transfer varying forces to the GL and SL, potentially contributing to SLEA asymmetry. An intervention strategy that can reduce SLEA asymmetry in BD is needed, as is the identification of elements of ballet training that contribute to maintaining a normal SLEA.
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