That results from the sustainedcontraction of the facial muscles.
由于面部肌肉的持续收缩。
2
They result from sustainedcontraction of face and neck muscles, often due to fatigue, stress, or frustration.
肇因于面部和颈部肌肉的持续紧缩，通常是因过度劳累、压力和挫折而产生。
3
The analysis of the surface myoelectric signal is a valuable and the signal is recorded while a muscle is performing a sustainedcontraction tool for assessing the progression of localized fatigue.