疲劳现象,是每个人都有过的体验。它是在进行了一定的脑力和体力活动后,主观上感觉有些力不从心,客观上表现为工作能力下降的一种状态。疲劳是正常的生理现象。出现疲劳,经过休息,可以完全消除。但是,如疲劳过度或不能及时恢复,天长日久就会发生积累现象。这时工作能力的降低,不再是一时性的,而多少带有持续性和顽固性的特点。同时身体很多方面的功能也会出现不同程度的失常。所以 Fatigue is an experience everyone has had. It is in a certain mental and physical activity, the subjective feeling a bit powerless, objectively manifested as a decline in ability to work a state. Fatigue is a normal physiological phenomenon. Fatigue, after a break, can be completely eliminated. However, if over-exhaustion or failure to recover in time, accumulation will occur over time. At this moment, the reduction of working ability is no longer temporary, but more or less persistent and intractable. At the same time, many aspects of the body’s function will appear in varying degrees of disorders. and so