Evaluation of jaw and neck muscle activities while chewing using EMG-EMG transfer function and EMG-EMG coherence function analyses in healthy subjects
Evaluation of jaw and neck muscle activities while chewing using EMG-EMG transfer function and EMG-EMG coherence function analyses in healthy subjects
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DOI：
10.1016/j.physbeh.2016.03.023
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发表时间：
2016-06-01
影响因子：
2.9
通讯作者：
Endo, Hiroshi
中科院分区：
文献类型：
--
作者：
Ishii, Tomohiro;Narita, Noriyuki;Endo, Hiroshi
本研究旨在利用肌电图传递函数和肌电图相干函数分析，定量阐明20名健康受试者嚼口香糖时下颌和颈部肌肉肌电图节律性协调活动的生理特征。以咀嚼侧咬肌肌电信号为参考信号，以其他颌骨（非咀嚼侧咬肌、双侧颞前肌、双侧胃前肌）和颈部肌肉（双侧胸锁乳突肌）肌电信号为检测信号进行肌电图传递函数和肌电图相干函数分析。咀嚼相关的下颌和颈部肌肉活动聚集在有节奏咀嚼的功率谱的第一个峰。峰值频率的增加代表了有节奏咀嚼时下颌和颈部肌肉活动之间的权力关系。峰值频率的相位代表了颌骨和颈部肌肉活动之间的时间关系，而非咀嚼侧颈部肌肉在颌骨闭合和打开阶段呈现广泛的分布。峰值频率的一致性代表了双侧颌合肌和咀嚼侧颈肌活动的协同特征。非咀嚼侧颈肌活动的相干性与相位呈显著负相关。由上可知，咀嚼时，非咀嚼侧颈肌与合颚肌同步激活时，估计双侧颌颈肌活动的协调性，而非咀嚼侧颈肌在开颚期不规则激活时，估计单侧颌颈肌活动的协调性。因此，颌骨和颈部肌肉活动中出现的双侧或单侧协调特征可能与节律咀嚼时非咀嚼侧颈部肌肉活动的相位特征相对应。考虑到健康受试者的这些新发现，肌电图传递函数和肌电图相干功能分析也可能有助于诊断颞下颌障碍和关键咀嚼行为中颈部肌肉活动的病理不协调特征。(C) 2016年作者。Elsevier Inc.出版。
This study aims to quantitatively clarify the physiological features in rhythmically coordinated jaw and neck muscle EMG activities while chewing gum using EMG-EMG transfer function and EMG-EMG coherence function analyses in 20 healthy subjects. The chewing side masseter muscle EMG signal was used as the reference signal, while the other jaw (non-chewing side masseter muscle, bilateral anterior temporal muscles, and bilateral anterior di-gastric muscles) and neck muscle (bilateral sternocleidomastoid muscles) EMG signals were used as the examined signals in EMG-EMG transfer function and EMG-EMG coherence function analyses. Chewing-related jaw and neck muscle activities were aggregated in the first peak of the power spectrum in rhythmic chewing. The gain in the peak frequency represented the power relationships between jaw and neck muscle activities during rhythmic chewing. The phase in the peak frequency represented the temporal relationships between the jaw and neck muscle activities, while the non-chewing side neck muscle presented a broad range of distributions across jaw closing and opening phases. Coherence in the peak frequency represented the synergistic features in bilateral jaw closing muscles and chewing side neck muscle activities. The coherence and phase in non-chewing side neck muscle activities exhibited a significant negative correlation. From above, the bilateral coordination between the jaw and neck muscle activities is estimated while chewing when the non-chewing side neck muscle is synchronously activated with the jaw closing muscles, while the unilateral coordination is estimated when the non chewing side neck muscle is irregularly activated in the jaw opening phase. Thus, the occurrence of bilateral or unilateral coordinated features in the jaw and neck muscle activities may correspond to the phase characteristics in the non-chewing side neck muscle activities during rhythmical chewing. Considering these novel findings in healthy subjects, EMG-EMG transfer function and EMG-EMG coherence function analyses may also be useful to diagnose the pathologically in-coordinated features in jaw and neck muscle activities in temporomandibular disorders and whiplash-associated disorders during critical chewing performance. (C) 2016 The Authors. Published by Elsevier Inc.