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Abstract：
Introduction: Scapular dyskinesis is commonly associated with subacromial pain syndrome (SAPS). Addressing scapular dyskinesis is widely accepted as an important component of shoulder rehabilitation. Our previous randomized controlled trial showed that Yi Jin Bang (YJB) exercises could effectively manage SAPS, but scapular motions and muscle activity during YJB exercises remain unknown. This study examined scapular kinematics synchronously with scapular muscle activation during YJB exercises. Methods: Thirty healthy participants with no shoulder complaints were enrolled in this study. Three-dimensional (3D) scapular kinematics and electromyography (EMG) activation of the upper trapezius, middle trapezius, lower trapezius, serratus anterior, anterior deltoid, middle deltoid, and posterior deltoid were synchronously measured during nine YJB movements. Results: During all YJB movements, the scapula was upwardly rotated and anteriorly tilted, with more upward rotation and a similar or less anterior tilt than the mean resting scapular angle. Column rotation, arm crossover, shoulder support circle, and armpit support high lift generated more internal rotation than the mean resting scapular angle, with the angles of internal rotation significantly greater than the other five movements (p < 0.001). Regarding EMG activity, all YJB movements elicited low activity (1.42%-19.19% maximal voluntary isometric contraction [MVIC]) from the upper trapezius and posterior deltoid and low to moderate activity (0.52%-29.50% MVIC) from the middle trapezius, lower trapezius, serratus anterior, anterior deltoid, and middle deltoid. Conclusion: YJB exercises could be useful in the middle to later phases of shoulder rehabilitation. For patients with insufficient external rotation, some YJB movements should be prescribed with caution.
摘要：
简介：肩胛骨发育不良通常与肩峰下疼痛综合征（SAPS）有关。治疗肩胛骨发育不全是肩关节康复的重要组成部分。我们之前的随机对照试验表明，易金邦（YJB）运动可以有效地管理SAPS，但是YJB运动期间的肩胛骨运动和肌肉活动仍然未知。这项研究在YJB运动过程中同步检查了肩胛骨运动学和肩胛骨肌肉的激活。方法：本研究招募了30名没有肩部不适的健康参与者。上斜方肌的三维（3D）肩胛骨运动学和肌电图（EMG）激活，中斜方肌,下斜方肌,前锯齿肌，前三角肌,中间三角肌,在9次YJB运动中同步测量后三角肌。结果：在所有YJB运动中，肩胛骨向上旋转，向前倾斜，与平均静止肩胛骨角度相比，向上旋转更多，向前倾斜相似或更少。色谱柱旋转,臂交叉,肩部支撑圈,和腋窝支撑高升力产生更多的内部旋转比平均静息肩胛骨角度，内旋转角度明显大于其他五个运动(p<0.001)。关于EMG活动，所有YJB运动均引起上斜方肌和后三角肌的低活动（1.42％-19.19％的最大自愿等距收缩[MVIC]），以及中斜方肌的低至中等活动（0.52％-29.50％的MVIC）。下斜方肌,前锯齿肌，前三角肌,和中间三角肌。结论：YJB锻炼可用于肩关节康复的中后期。对于外部旋转不足的患者，一些YJB运动应谨慎规定。
