Long term three shifts interfere with the normal operation of the clock, which will inevitably lead to certain physiological rhythm disorder, endocrine disorder, affect health, or cause some diseases.
Three shifts is a kind of shift system. The enterprise divides the staff into three shifts according to the production needs, namely, the morning shift, the middle shift and the night shift. In the case of the implementation of the "positive sequence shift method", the workers are transferred from the morning shift to the middle shift, and from the middle shift to the night shift, and so on. In the case of implementing the "reverse order shift method", the employees are transferred from the morning shift to the night shift, and from the night shift to the middle shift, and so on.