Experimentally induced masseter-pain changes masseter but not sternocleidomastoid muscle-related activity during mastication

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• 作者：Fernanda Pasinato^a ; ^{fepasinato@gmail.com}Author Vitae ; Clarissa C. Santos-Couto-Paz^bAuthor Vitae ; Jorge Luis Lopes Zeredo^bAuthor Vitae ; Sergio Bruzadelli Macedo^cAuthor Vitae ; Eliane C.R. Corrê ; a^a ; ^dAuthor Vitae
• 关键词：Surface electromyography ; Mastication ; Experimental jaw-muscle pain ; Masticatory muscles ; Neck muscles
• 刊名：Journal of Electromyography and Kinesiology
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：31
• 期：Complete
• 页码：88-95
• 全文大小：554 K
• 卷排序：31

文摘

The aim of this study was to verify the effects of induced masseter-muscle pain on the amplitude of muscle activation, symmetry and coactivation of jaw- and neck-muscles during mastication. Twenty-eight male volunteers, mean age ± SD 20.6 ± 2.0 years, participated in this study. Surface electromyography of the masseter and sternocleidomastoid (SCM) muscles was performed bilaterally during mastication of a gummy candy before and after injections of monosodium glutamate solution and isotonic saline solution. As a result, we observed a decrease in the amplitude of activation of the masseter muscle on the working side (p = 0.009; d = 0.34) and a reduction in the asymmetry between the working and the balancing side during mastication (p = 0.007; d = 0.38). No changes were observed either on the craniocervical electromyographic variables. In conclusion, experimentally induced pain reduced the masseter muscle activation on the working side, thereby reducing the physiological masseters’ recruitment asymmetry between the two sides during mastication. No effects on SCM activity were detected. These results may partly explain the initial maladaptative changes underlying TMD conditions.