疲劳是人体经常发生的生理现象,就人体整体而言,绝大多数疲劳都属于有感觉疲劳。当过度或极度疲劳时,机体对疲劳处于无感觉状态,可出现无感觉疲劳。按疲劳的轻重程度,分为一般疲劳,即轻微疲劳、明显疲劳、严重疲劳、过度和极度疲劳。按组织器官及其功能划分,神经性疲劳,包括大脑神经网络疲劳、植 Fatigue is a physiological phenomenon often occurs in the body, the body as a whole, most of the fatigue belongs to feel tired. When excessive or extreme fatigue, the body is in a state of no feeling of fatigue, there may be no feeling of fatigue. According to the severity of fatigue, divided into general fatigue, that is, mild fatigue, significant fatigue, severe fatigue, excessive and extreme fatigue. According to the classification of tissues and organs and their function, nervous fatigue, including brain neural network fatigue,