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J Electromyogr Kinesiol. 2010 Aug;20(4):701-9. doi: 10.1016/j.jelekin.2009.12.003. Epub 2010 Jan 22.
Forward head and rounded shoulder posture (FHRSP) is theorized to contribute to alterations in scapular kinematics and muscle activity leading to the development of shoulder pain. However, reported differences in scapular kinematics and muscle activity in those with forward head and rounded shoulder posture are confounded by the presence of shoulder pain. Therefore, the purpose of this study was to compare scapular kinematics and muscle activity in individuals free from shoulder pain, with and without FHRSP. Eighty volunteers were classified as having FHRSP or ideal posture. Scapular kinematics were collected concurrently with muscle activity from the upper and lower trapezius as well as the serratus anterior muscles during a loaded flexion and overhead reaching task using an electromagnetic tracking system and surface electromyography. Separate mixed model analyses of variance were used to compare three-dimensional scapular kinematics and muscle activity during the ascending phases of both tasks. Individuals with FHRSP displayed significantly greater scapular internal rotation with less serratus anterior activity, during both tasks as well as greater scapular upward rotation, anterior tilting during the flexion task when compared with the ideal posture group. These results provide support for the clinical hypothesis that FHRSP impacts shoulder mechanics independent of shoulder pain.
头前引和圆肩姿势（FHRSP）被认为会导致肩胛骨运动学和肌肉活动的改变，从而导致肩部疼痛的发生。然而，在存在肩部疼痛的情况下，报道的具有头前引和圆肩姿势的人的肩胛骨运动学和肌肉活动的差异存在混淆。因此，本研究的目的是比较无肩部疼痛的个体与有和无头前引和圆肩姿势的个体的肩胛骨运动学和肌肉活动。80 名志愿者被分为具有头前引和圆肩姿势或理想姿势的组。在进行负重前屈和过头伸展任务时，使用电磁跟踪系统和表面肌电图同时收集来自上、下斜方肌和前锯肌的肩胛骨运动学和肌肉活动数据。使用混合模型方差分析分别比较了这两个任务上升阶段的三维肩胛骨运动学和肌肉活动。与理想姿势组相比，有头前引和圆肩姿势的个体在两个任务中都表现出明显更大的肩胛骨内旋和更小的前锯肌活动，以及在屈曲任务中更大的肩胛骨上旋和前倾斜。这些结果为 FHRSP 独立于肩部疼痛影响肩部力学的临床假说提供了支持。
