Rachael Greenwell, University of Wyoming, Laramie, Wyoming, USA.
Margaret Wilson, University of Wyoming, Laramie, Wyoming, USA;, Email:
J Dance Med Sci. 2020 Sep 15;24(3):135-141. doi: 10.12678/1089-313X.24.3.135.
The purpose of this study was to determine what differences exist when performing grand plié with and without the barre. Differences in center of pressure (COP) sway, trunk kinematics, and lower extremity kinematics were used in this analysis for both first (P1) and fifth positions (P5). It was hypothesized that use of the barre would result in decreased COP sway, but increased asymmetries in trunk and lower extremity kinematics would be seen compared with the same movements performed without the barre in both positions. Sixteen collegiate dancers (1 male, 15 female) performed three trials of grand plié in P1 and P5 (right leg crossed in front) with or without the barre, for a total of 12 trials. For the barre condition (BC), participants demonstrated less time to complete grand plié, slightly less depth in grand plié, and decreased anterior-posterior (AP) sway compared to the without barre condition (WBC). The BC condition showed increased peak left trunk rotation, right knee flexion, decreased right and left peak hip flexion, and increased right hip abduction in both P1 and P5. Comparing P1 to P5, there was decreased AP sway, decreased peak left trunk rotation, decreased peak right and left hip flexion, increased left hip abduction, and decreased right knee flexion in both BC and WBC conditions. For the BC, there was increased right hip abduction in P1 compared to P5. Our results indicate that while use of the barre provides proprioceptive information, which helps dancers to control balance and learn a motor control strategy, grand plié should also be taught without the barre to challenge the dancer's balance control with different movement patterns in space.
本研究旨在确定在有无把杆的情况下进行大劈叉时存在哪些差异。本分析使用了两种姿势（第一和第五位置）的中心压力（COP）摆动、躯干运动学和下肢运动学的差异。假设使用把杆会导致 COP 摆动减少，但与同样的动作相比，在两种姿势下使用把杆会导致躯干和下肢运动学的不对称性增加。16 名大学生舞者（1 名男性，15 名女性）在第一和第五位置（右腿交叉在前）进行了三次大劈叉试验，有无把杆，共 12 次。在有把杆条件（BC）下，参与者完成大劈叉的时间更短，大劈叉的深度略浅，前后摆动（AP）摆动幅度也比无把杆条件（WBC）小。BC 条件下，左躯干旋转峰值增加，右膝屈曲减少，右髋和左髋屈曲峰值减少，右髋外展增加，无论在第一还是第五位置。与第一位置相比，在 P1 和 P5 中，AP 摆动减少，左躯干旋转峰值减少，右和左髋屈曲峰值减少，左髋外展增加，右膝屈曲减少，无论在 BC 还是 WBC 条件下。对于 BC，与 P5 相比，P1 时右髋外展增加。我们的结果表明，虽然使用把杆提供了本体感觉信息，帮助舞者控制平衡并学习运动控制策略，但也应该在没有把杆的情况下教授大劈叉，以通过不同的空间运动模式挑战舞者的平衡控制。
