MASTICATORY MUSCLE FATIGUE - ENDURANCE TIMES AND SPECTRAL CHANGES IN THE ELECTROMYOGRAM DURING THE PRODUCTION OF SUSTAINED BITE FORCES
MASTICATORY MUSCLE FATIGUE - ENDURANCE TIMES AND SPECTRAL CHANGES IN THE ELECTROMYOGRAM DURING THE PRODUCTION OF SUSTAINED BITE FORCES
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DOI：
10.1016/0003-9969(92)90134-t
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发表时间：
1992-07-01
影响因子：
3
通讯作者：
GAY, T
中科院分区：
文献类型：
--
作者：
MATON, B;RENDELL, J;GAY, T
本实验的目的是确定在肢体肌肉系统中观察到的疲劳特征是否在咀嚼肌（特别是咬肌和颞肌）中也很明显。将表面电极放置在 10 名成人的咬肌和颞肌两侧。每个受试者都被指示尽可能长时间地保持最大和六个级别的次最大切牙咬合力。在任务开始和失败时计算每块肌肉的肌电信号的功率密度谱。随着咬合力的增加，耐力时间的减少遵循与四肢肌肉类似的模式，并且每块肌肉的特征在于功率密度谱的平均功率频率的一致减少和均方根的可变变化。力量。均方根变化的可变性功率（与肢体肌肉的变化不一致）可以用运动单位发射率的变化或肌肉对咬合力产生的相对贡献来解释。分析还证明了咬合力和均方根值之间的曲线关系。功率，但咬合力与功率密度谱的平均功率频率之间没有关系。
The purpose of this experiment was to determine if the characteristics of fatigue observed in the limb muscle system are also evident in the muscles of mastication, specifically, the masseter and temporalis. Surface electrodes were placed bilaterally over the masseter and temporalis muscles of 10 adults. Each subject was instructed to maintain maximal and six levels of submaximal incisal bite forces for as long as possible. The power density spectrum of the electromyographic signals for each muscle was calculated at the onset and failure of the task. The decrease in endurance time with an increase in bite force followed a pattern similar to that in limb muscles, and each muscle was characterized by a consistent reduction in the mean power frequency of the power density spectrum and a variable change in r.m.s. power. The variability of changes in r.m.s. power (which is inconsistent with changes found in the limb muscles) was explained in terms of either changes in motor-unit firing rate or the muscle's relative contribution to the generation of bite force. The analyses also demonstrated a curvilinear relationship between bite force and r.m.s. power, but no relationship between bite force and the mean power frequency of the power density spectrum.