Lin Chai-Wei, Su Fong-Chin, Lin Cheng-Feng
Department of Biomedical Engineering, College of Engineering, National Cheng Kung University, Tainan, Taiwan.
Department of Physical Therapy, Shu Zen Junior College of Medicine and Management Kaohsiung, Kaohsiung, Taiwan.
Front Bioeng Biotechnol. 2019 Oct 25;7:290. doi: 10.3389/fbioe.2019.00290. eCollection 2019.
Turning is an important but difficult movement, often performed in ballet choreography. Understanding the postural sway during ballet turns is beneficial to both dancers and dance teachers alike. Accordingly, this study evaluated the postural sway angle during ballet turns in female novice and experienced ballet dancers by means of the inclination angle, determined from the center of mass (COM) and center of pressure (COP). Thirteen experienced dancers and 13 novice dancers performed ballet turns (). The COM-COP inclination angle was measured during the preparatory, double-leg support, and single-leg support phases of the turn. The novice dancers exhibited significantly greater ranges of the COM-COP inclination angle in the anterior-posterior (AP) and medial-lateral (ML) directions during the preparatory (AP direction, < 0.001; ML direction = 0.035), double-leg support (AP direction < 0.038; ML direction = 0.011), and ending phases (AP direction < 0.001; ML direction = 0.024). Moreover, during the preparatory phase, the novice dancers failed to adjust their posture in a timely manner, and therefore showed overshooting errors. Finally, during the ending phase, the novice dancers showed a greater standard deviation of the COM-COP inclination angles and performed continual postural adjustments, leading to a less smooth movement than the experienced dancers. In conclusion, the novice dancers were suggested to focus on the COM-COP adjustment during both preparatory and ending phases.
旋转是一项重要但困难的动作，常在芭蕾舞编排中出现。了解芭蕾舞旋转过程中的姿势摇摆对舞者和舞蹈教师都有益处。因此，本研究通过由重心（COM）和压力中心（COP）确定的倾斜角度，评估了女性新手和有经验的芭蕾舞舞者在芭蕾舞旋转过程中的姿势摇摆角度。13名有经验的舞者和13名新手舞者进行了芭蕾舞旋转（）。在旋转的准备阶段、双腿支撑阶段和单腿支撑阶段测量了COM-COP倾斜角度。新手舞者在准备阶段（前后方向，<0.001；内外方向=0.035）、双腿支撑阶段（前后方向<0.038；内外方向=0.011）和结束阶段（前后方向<0.001；内外方向=0.024）的COM-COP倾斜角度在前后（AP）和内外（ML）方向上的范围明显更大。此外，在准备阶段，新手舞者未能及时调整姿势，因此出现了超调误差。最后，在结束阶段，新手舞者的COM-COP倾斜角度标准差更大，并且进行了持续的姿势调整，导致动作不如有经验的舞者流畅。总之，建议新手舞者在准备阶段和结束阶段都要注重COM-COP的调整。
