用于确定工作强度超过定义的极限（永久应变极限）时效率下降的操作员相关特征值。根据压力的不同，可能会发生体育锻炼期间的肌肉疲劳，脑力劳动期间的中枢疲劳或对所有感觉器官（例如眼睛）的需求增加。疲劳可以通过休闲时间来补偿。

       Operator-related characteristic value for determining the decrease of efficiency when the working intensity exceeds a defined limit, the permanent strain limit. Depending on the stress, muscle fatigue during physical work, central fatigue during mental work, or increasing demands on all sensory organs, e.g. the eyes, may occur. Fatigue is compensated by recreation periods.