Correlation between the submental surface electromyogram and the thyrohyoid or the geniohyoid electromyograms

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  • 舌骨上筋群表面筋電図と甲状舌骨筋およびオトガイ舌骨筋筋電図との比較

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Abstract

The submental surface electromyography (EMG) is considered non-invasive and effective technique to reveal the beginning of deglutition. However, it is not measured each muscular contraction directly. The purpose of this article is to compare the submental EMG with the muscular activities concerned with laryngeal elevation.<BR>The subjects were five healthy young males aged 25-31 yr. The submental surface EMG and EMGs of the thyrohyoid and the geniohyoid muscles were concurrently recorded.<BR>There were two changes on the wave of the submental EMG at deglutition. The former change had small amplitude and the latter had large amplitude. We define the onset of the former as EMG1 and the onset of the latter as EMG2.<BR>EMG1 is most associated with the onset of the geniohyoid muscle activity. It shows that EMG1 is the beginning of the oral phase of the deglutition. EMG2 is most associated with the onset of the thyrohyoid muscle activity. It shows that EMG2 is the beginning of the pharyngeal phase of the deglutition. We conclude that the submental EMG is useful to reveal the onset of the oral and pharyngeal phases of deglutition.

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