Kashiwagi K, Tanaka M, Kimura K, Tosa J, Imanishi T, Kawazoe T
Department of Fixed Prosthodontics, Osaka Dental University, Japan.
J Osaka Dent Univ. 1995 Apr;29(1):1-8.
Surface electromyography (EMG) has been widely used in clinical dentistry, although interpretation of the raw data is difficult owing to its low reproducibility. Linear EMG envelopes, also known as EMG profiles, which are normalized with respect to raw EMG amplitudes and stride, have been developed to analyze the time course of gait stride. Normalized EMG contraction patterns can be used for comparing individuals or recording sessions on the same individual made at different times. We made EMG profiles during unilateral gum chewing for the masticatory muscles of five asymptomatic volunteers. EMG signals were recorded from the anterior temporal (Ta), masseter (M) and anterior belly of the digastric (Da) muscles on the subject's preferred chewing side. The mandibular kinesiograph was used for tracking incisal point movement during chewing. EMGs and kinesiometric data were simultaneously recorded for 90 seconds. Ensemble averages of EMG profiles were made from 10 stable strokes after 60 seconds of initiation of chewing. Phasic characteristics of the EMG profiles were evaluated by product-moment correlation and intraclass correlation coefficients. Although the EMG profiles for Ta and M were very similar, those for Da were different from the elevator muscles.
表面肌电图（EMG）已在临床牙科中广泛应用，尽管由于其再现性低，原始数据的解读较为困难。线性肌电图包络，也称为肌电图轮廓，通过原始肌电图幅度和步幅进行归一化处理，已被用于分析步态步幅的时间进程。归一化的肌电图收缩模式可用于比较个体或记录同一人在不同时间的情况。我们对五名无症状志愿者咀嚼肌单侧嚼口香糖时进行了肌电图轮廓分析。在受试者偏好的咀嚼侧，从颞前肌（Ta）、咬肌（M）和二腹肌前腹（Da）记录肌电信号。下颌运动描记仪用于追踪咀嚼过程中切牙点的运动。肌电图和运动测量数据同时记录90秒。咀嚼开始60秒后，从10次稳定的咀嚼动作中得出肌电图轮廓的总体平均值。通过积差相关和组内相关系数评估肌电图轮廓的相位特征。尽管Ta和M的肌电图轮廓非常相似，但Da的肌电图轮廓与提升肌不同。
