Department of Rehabilitation and Physiotherapy, Medical University of Lublin, 20-093 Lublin, Poland.
Independent Unit of Functional Masticatory Disorders, Medical University of Lublin, 20-093 Lublin, Poland.
Int J Environ Res Public Health. 2022 Jan 29;19(3):1577. doi: 10.3390/ijerph19031577.
This study aimed to assess the relationship between the occurrence of cervical myofascial pain with active myofascial trigger points (MTrPs) within the upper trapezius muscle and the electromyographic asymmetry index (AsI) of masticatory muscles: temporalis anterior (TA), superficial part of the masseter muscle (MM), and anterior belly of the digastric muscle (DA). The study group comprised 100 subjects (80 women and 20 men) aged 18 to 30 years (mean 23 ± 2.6 years) reporting pain in the neck muscles, diagnosed with myofascial pain with active MTrPs only within the upper trapezius muscle. The control group comprised 60 healthy, pain-free subjects (42 women and 18 men) aged 20 to 30 years (mean 22.8 ± 2.6 years) without MTrPs in the upper trapezius muscle. The palpation measurement, based on the diagnostic criteria of Travell and Simons, was used to diagnose active MTrPs. The masticatory muscle activity was recorded using an 8-channel device for surface electromyography-BioEMG III. Significant differences in electromyographic patterns between the group with MTrPs in the right side of upper trapezius muscle and the control group were observed within resting activity for the AsI TA (MTrPs: 8.64 vs. controls: -3.22; = 0.001) and AsI MM (MTrPs: 7.05 vs. controls: -2.09; = 0.018). Controls presented different electromyographic patterns during maximum voluntary clenching with cotton rolls between teeth within masseter muscle compared to the MTrPs group (MTrPs: 9.27 vs. controls: -0.43 vs. = 0.041). Participants with MTrPs in the left side of upper trapezius muscle presented predomination of left-sided electromyographic patterns at rest within temporalis anterior in comparison to controls (MTrPs: -19.22 vs. controls: -3.22; = 0.001). MTrPs within the trapezius muscle may be related to asymmetry within the masticatory muscle activity, suggesting that the presence of myofascial pain within the cervical muscles plays a role in the imbalance of the stomatognathic system. A unilateral active MTrPs within the trapezius muscle may increase the sEMG activity on the same side of the temporalis anterior and masseter muscles.
本研究旨在评估颈肌筋膜疼痛与上斜方肌内活动肌筋膜触发点（MTrPs）之间的关系，以及咀嚼肌的肌电图不对称指数（AsI）：颞肌前（TA）、浅层咬肌（MM）和二腹肌前腹（DA）。研究组包括 100 名年龄在 18 至 30 岁（平均 23 ± 2.6 岁）的受试者，这些受试者报告颈部肌肉疼痛，且仅在上斜方肌内患有肌筋膜疼痛伴活动 MTrPs。对照组包括 60 名健康、无痛的受试者（42 名女性和 18 名男性），年龄在 20 至 30 岁（平均 22.8 ± 2.6 岁），上斜方肌内无 MTrPs。触诊测量采用 Travell 和 Simons 的诊断标准，用于诊断活动 MTrPs。咀嚼肌活动使用 8 通道表面肌电图设备-BioEMG III 进行记录。在右侧上斜方肌 MTrPs 组和对照组中，静息状态下，TA 的 AsI（MTrPs：8.64 比对照组：-3.22； = 0.001）和 MM 的 AsI（MTrPs：7.05 比对照组：-2.09； = 0.018）的肌电图模式存在显著差异。与 MTrPs 组相比，对照组在磨牙间用棉卷最大自主紧咬时，肌电图模式不同（MTrPs：9.27 比对照组：-0.43； = 0.041）。与对照组相比，左侧上斜方肌 MTrPs 组在静息时，左侧 TA 的肌电图模式占主导地位（MTrPs：-19.22 比对照组：-3.22； = 0.001）。上斜方肌内的 MTrPs 可能与咀嚼肌活动的不对称性有关，这表明颈肌内的肌筋膜疼痛在咀嚼系统的失衡中起作用。上斜方肌内单侧活动 MTrPs 可能会增加同侧 TA 和咬肌的 sEMG 活动。
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