Clinical evaluation of masticatory muscles activity during habitual mastication: a study about normalization of electromyographic data
Avaliação clínica da atividade dos músculos mastigatórios durante a mastigação habitual – um estudo sobre a normalização de dados eletromiográficos
Duarte Kroll, Cláudia; Bérzin, Fausto; Alves, Marcelo Corrêa
Rev. odontol. UNESP, vol.39, n3, p.157-162, 2010
Abstract
The aim of this study was to compare qualitatively and quantitatively the normalized and non-normalized (raw data) EMG amplitude of masticatory muscles between women symptomatic and asymptomatic for temporomandibular disorders (TMD). The electromyographic activity of masseter and anterior temporal muscle of 41 women was analyzed (20 symptomatic and 21 asymptomatic for TMD) during the mastication. After normalization by the Submaximal Voluntary Isometric Contraction, the data were compared by Wilcoxon test. The significance level was set at 5%. When the electromyographic absolute data were compared, masseter muscle activity was significantly lower in TMD Group than in Control Group. After normalization of the data, there were not observed differences between these groups. According to the results obtained, it can be suggested that the raw EMG data can represent clinical findings observed in qualitative analysis of the EMG signal.
Keywords
Masseter muscle, temporal muscle, electromyography
Resumo
Este estudo tem como objetivo comparar, qualitativa e quantitativamente, a amplitude eletromiográfica normalizada e não normalizada (dados absolutos) dos músculos mastigatórios de mulheres sintomáticas e assintomáticas para a disfunção temporomandibular (DTM). Foi analisada a atividade eletromiográfica dos músculos masseter e temporal (parte anterior), durante a mastigação habitual, de 41 mulheres, sendo 20 sintomáticas e 21 assintomáticas para a DTM. Após a normalização pela Contração Isométrica Voluntária Submáxima, os dados foram comparados com base no Teste de Wilcoxon. O nível de significância ficou estabelecido em 5%. Quando comparados os dados absolutos, notou-se que, a atividade do músculo masseter foi significativamente menor no Grupo DTM em relação à do Grupo Controle. Depois da normalização das informações, não foram verificadas diferenças entre os dois grupos mencionados. De acordo com os resultados obtidos, pode-se sugerir que, os dados absolutos podem representar achados clínicos, observados na análise qualitativa do sinal eletromiográfico.
Palavras-chave
Músculo masseter, músculo temporal, eletromiografia
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