National Institute of Dance Medicine and Science, and Trinity Laban Conservatoire of Music & Dance, London, United Kingdom;, Email:
Department of Sport and Exercise Sciences, University of Thessaly, Trikala, Greece; and Sport and Physical Activity Research Centre and School of Performing Arts, University of Wolverhampton, Walsall, United Kingdom.
J Dance Med Sci. 2020 Nov 15;24(4):183-189. doi: 10.12678/1089-313X.24.4.183.
Although traditional dance training aims to train dancers' legs equally, the recognized practice of predominately starting and repeating exercises on one side more than the other has led to suggestions that technique classes may cause lateral bias. Such an imbalance could lead to a greater risk of injury; however, despite this potential risk, little is known about the effects of bilateral differences on dancers' postural stability during jump landings, a key dynamic action in dance. Therefore, the aim of this study was to examine the effects of possible bilateral differences on dynamic postural stability during single-leg landing using a time-to-stabilization protocol. Thirty-two injury-free female university undergraduate dancers (19 ± 1.9 years; 164.8 ± 6.7 cm; 62.6 ± 13.6 kg) volunteered for the study. They completed a two-foot to one-foot jump over a bar onto a force platform while stabilizing as quickly as possible. The landing leg was randomly assigned, and participants completed three trials for each leg. No significant differences in dynamic postural stability between right and left legs were revealed, and poor effect size was noted (p > 0.05): MLSI: t = -.04, df = 190, p = 0.940 (CI = -.04, .04, r² = 0); APSI: t = .65, df = 190, p = 0.519 (CI = -.06-, .12, r² = .09); VSI: t = 1.85, df = 190, p = 0.066 (CI = -.02, .68, r² = .27); DPSI: t = 1.88, df = 190, p = 0.061 (CI = -.02, .70, r² = .27). The results of this study do not support the notion that dance training may cause lateral bias with its associated risk of injury. Furthermore, dancers' self-perceptions of leg dominance did not correlate with their ability to balance in single-leg landings or to absorb the ground reaction forces often associated with injury. Even when biased training exists, it may not have detrimental effects on the dancer's postural stability.
虽然传统的舞蹈训练旨在均衡地训练舞者的腿部，但人们普遍认为，练习主要从一侧开始并重复练习，这导致了技术课程可能会导致侧偏的说法。这种不平衡可能会导致更大的受伤风险；然而，尽管存在这种潜在风险，但对于舞蹈中关键的动态动作——单腿落地时跳跃的双侧差异对舞者姿势稳定性的影响知之甚少。因此，本研究的目的是使用稳定时间协议检查可能的双侧差异对单腿落地时动态姿势稳定性的影响。32 名无损伤的女大学生舞者（19 ± 1.9 岁；164.8 ± 6.7cm；62.6 ± 13.6kg）自愿参加了这项研究。她们在力台上用双脚跳过一根横杆到一只脚进行单脚跳跃，同时尽可能快速地稳定身体。落地腿随机分配，每位参与者每条腿完成三次试验。研究结果显示，右腿和左腿的动态姿势稳定性没有显著差异，且效果量较差（p＞0.05）：MLSI：t=-0.04，df=190，p=0.940（CI=-0.04，0.04，r²=0）；APSI：t=0.65，df=190，p=0.519（CI=-0.06，0.12，r²=0.09）；VSI：t=1.85，df=190，p=0.066（CI=-0.02，0.68，r²=0.27）；DPSI：t=1.88，df=190，p=0.061（CI=-0.02，0.70，r²=0.27）。本研究结果不支持舞蹈训练可能导致与受伤风险相关的侧偏的观点。此外，舞者对腿部优势的自我认知与他们在单腿落地时的平衡能力或吸收与受伤相关的地面反作用力的能力无关。即使存在偏侧训练，它也可能不会对舞者的姿势稳定性产生不利影响。
