肌电信号是一种生物电信号.生物电的产生与生物体细胞膜对离子的特殊通透性有关.静止的时候细胞膜对K~+有较大的通透性,兴奋时细胞膜却对Na~+有较大的通透.在有机体内细胞外主要的正离子是Na~+,细胞内主要的正离子是K~+.在不同的状态下,钠钾离子通透方向发生变化,从而使细胞膜内外的电位发生变化,这变化的电位就是生物电的动作电位.肌电信号就是发生在肌肉部位的动作电位. Myoelectric signal is a kind of bioelectrical signal.The generation of bioelectricity is related to the special permeability of biological cell membrane to ion.When static cell membrane has greater permeability to K ~ + Is more transparent in the body of the main extracellular positive ions are Na ~ +, the main intracellular cation is K ~ + in different states, sodium and potassium permeability direction of change, so that Changes in the potential of the cell membrane inside and outside, this change in potential is the bioelectric action potential. EMG signal is the action potential in the muscle parts.