Liu Jinde, Hui Stanley Sai-Chuen, Yang Yijian, Liu Yanhao, Song Qipeng, Mao Dewei
Department of Sports Science and Physical Education, The Chinese University of Hong Kong, Hong Kong, China.
College of Sports and Health, Shandong Sport University, Jinan, China.
Front Physiol. 2023 Jun 8;14:1169092. doi: 10.3389/fphys.2023.1169092. eCollection 2023.
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. 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. 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 ( < 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. 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.
肩胛运动障碍通常与肩峰下疼痛综合征（SAPS）相关。解决肩胛运动障碍被广泛认为是肩部康复的重要组成部分。我们之前的随机对照试验表明，易筋棒（YJB）练习可以有效管理SAPS，但YJB练习期间的肩胛运动和肌肉活动仍然未知。本研究在YJB练习期间同步检查肩胛运动学与肩胛肌肉激活情况。30名无肩部不适的健康参与者纳入本研究。在九个YJB动作期间同步测量三维（3D）肩胛运动学以及斜方肌上束、斜方肌中束、斜方肌下束、前锯肌、三角肌前束、三角肌中束和三角肌后束的肌电图（EMG）激活情况。在所有YJB动作期间，肩胛骨向上旋转并向前倾斜，与平均静息肩胛角度相比，向上旋转更多，向前倾斜相似或更小。立柱旋转、手臂交叉、肩部支撑圈和腋窝支撑高举产生的内旋比平均静息肩胛角度更多，内旋角度显著大于其他五个动作（<0.001）。关于EMG活动，所有YJB动作引起斜方肌上束和三角肌后束的低活动（最大自主等长收缩[MVIC]的1.42%-19.19%）以及斜方肌中束、斜方肌下束、前锯肌、三角肌前束和三角肌中束的低至中度活动（0.52%-29.50% MVIC）。YJB练习可能对肩部康复的中晚期有用。对于外旋不足的患者，应谨慎开一些YJB动作。
