Coherence Analysis of Jaw and Neck Muscle Coordination during Chewing in Healthy Adults
송호준, 한상호, 김지연, 임영관,
소속 상세정보
송호준 ( Song Ho-Jun ) -
한상호 ( Han Sang-Ho ) -
김지연 ( Kim Ji-Yeon ) - Seoul Veterans Hospital Department of Oral Medicine
임영관 ( Im Yeong-Gwan ) -
Abstract
Purpose: Coordinated activity between the jaw and neck muscles is important in oral motor tasks such as chewing. This study examined coherence between the jaw and neck muscles during chewing in healthy adults.
Methods: A total of 12 healthy adults underwent electromyography (EMG) of the jaw and neck muscles during right-sided chewing at a frequency of 1 Hz. Surface electrodes were placed over the temporalis (TA), masseter (MS), anterior digastric (DA), and sternocleidomastoid (SM) muscles on the right side. EMG signals were processed for coherence and phase analysis using advanced signal processing techniques.
Results: The MS and TA muscle pair exhibited high synchronization when chewing (median coherence=0.992). Contrarily, the coherence values between the MS and DA, as well as the MS and SM muscle pairs, were relatively low (median coherence=0.848 and 0.957, respectively). Phase analysis revealed minimal temporal differences between the MS and TA muscle pair and the MS and SM muscle pair, whereas substantial phase shifts were observed between the MS and DA muscle pair.
Conclusions: During chewing in healthy adults, the TA muscle works synergistically whereas the DA muscle antagonistically with the MS muscle, and the SM muscle supports the activity of the MS muscle. The observed synchrony and coordination provide insights into the intricate interplay among these muscles during oral motor tasks.
키워드
Coherence; Electromyography; Masticatory muscles; Muscle coordination; Neck Muscles
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