Shi C S, Ouyang G, Guo T W
Prosthodontic Department, Fourth Military Medical University, Stomatological College, Xian Shaanxi, P.R. China.
J Prosthet Dent. 1991 Apr;65(4):553-6. doi: 10.1016/0022-3913(91)90299-c.
Thirteen normal subjects were selected for this investigation. At the vertical dimension of rest position and habitual clench, their myoelectric activities of the masseter, anterior and posterior temporal, and digastric muscles on the left and right sides were simultaneously sampled and processed by computer, and the mean power frequency (MPF) and the mean amplitude (MA) of the myoelectric signal were calculated. At rest position, the temporal muscles were major muscles and the MPF differences of various masticatory muscles were not significant. At habitual clench, with the increase in MA, the MPF of various muscles increased. The results show that MPF may have application in describing a central tendency of myoelectrical signal frequency distribution and in evaluating recruitment of motor units. MPF and MA are the quantitative indices reflecting masticatory muscle function.
本研究选取了13名正常受试者。在休息位垂直距离和习惯性紧咬时，同时采集其左右侧咬肌、颞肌前束和后束以及二腹肌的肌电活动，并通过计算机进行处理，计算肌电信号的平均功率频率（MPF）和平均幅度（MA）。在休息位时，颞肌是主要肌肉，各咀嚼肌的MPF差异不显著。在习惯性紧咬时，随着MA增加，各肌肉的MPF也增加。结果表明，MPF可用于描述肌电信号频率分布的集中趋势以及评估运动单位的募集情况。MPF和MA是反映咀嚼肌功能的定量指标。
