Department of Physical Therapy and Assistive Technology, National Yang Ming Chiao Tung University, Taipei, Taiwan.
School of Physical Therapy, Chang Gung University, Tao-Yuan City, Taiwan.
PLoS One. 2022 May 16;17(5):e0268533. doi: 10.1371/journal.pone.0268533. eCollection 2022.
The purpose of this study is to assess and compare corticospinal excitability in the upper and lower trapezius and serratus anterior muscles in participants with and without shoulder impingement syndrome (SIS). Fourteen participants with SIS, and 14 without SIS were recruited through convenient sampling in this study. Transcranial magnetic stimulation assessment of the scapular muscles was performed while the participants were holding their arm at 90 degrees scaption. The motor-evoked potential (MEP), active motor threshold (AMT), latency of MEP, cortical silent period (CSP), activated area and center of gravity (COG) of cortical mapping were compared between groups using the Mann-Whitney U tests. The SIS group demonstrated following significances, higher AMTs of the lower trapezius (SIS: 0.60 ± 0.06; Comparison: 0.54 ± 0.07, p = 0.028) and the serratus anterior (SIS: 0.59 ± 0.04; Comparison: 0.54 ± 0.06, p = 0.022), longer CSP of the lower trapezius (SIS: 62.23 ± 22.87 ms; Comparison: 45.22 ± 14.64 ms, p = 0.019), and posteriorly shifted COG in the upper trapezius (SIS: 1.88 ± 1.06; Comparison: 2.76 ± 1.55, p = 0.048) and the serratus anterior (SIS: 2.13 ± 1.02; Comparison: 3.12 ± 1.88, p = 0.043), than the control group. In conclusion, participants with SIS demonstrated different organization of the corticospinal system, including decreased excitability, increased inhibition, and shift in motor representation of the scapular muscles.
本研究旨在评估和比较患有和不患有肩峰下撞击综合征（SIS）的参与者的上、下斜方肌和前锯肌的皮质脊髓兴奋性。通过方便抽样，本研究招募了 14 名患有 SIS 的参与者和 14 名无 SIS 的参与者。在参与者将手臂保持在 90 度外展状态下，进行经颅磁刺激评估肩胛带肌肉。使用 Mann-Whitney U 检验比较两组之间的运动诱发电位（MEP）、主动运动阈值（AMT）、MEP 潜伏期、皮质静息期（CSP）、皮质映射的激活面积和重心（COG）。SIS 组表现出以下显著性差异：下斜方肌（SIS：0.60 ± 0.06；比较：0.54 ± 0.07，p = 0.028）和前锯肌（SIS：0.59 ± 0.04；比较：0.54 ± 0.06，p = 0.022）的 AMT 较高，下斜方肌的 CSP 较长（SIS：62.23 ± 22.87 ms；比较：45.22 ± 14.64 ms，p = 0.019），以及上斜方肌和前锯肌的 COG 向后移位（SIS：1.88 ± 1.06；比较：2.76 ± 1.55，p = 0.048）和前锯肌（SIS：2.13 ± 1.02；比较：3.12 ± 1.88，p = 0.043）。总之，患有 SIS 的参与者表现出不同的皮质脊髓系统组织，包括兴奋性降低、抑制性增加以及肩胛带肌肉运动代表的移位。
