ABSTRACT
Energy consumption and cardiac effort set limits for the capability to perform hard work; therefore, these body functions can serve to describe the severity of a physical task load. Similarly, the severity of a mental task load is commonly assessed by the demands that the associated stressors put on the human mind in terms of stress. In the case of an overload, the performance of the task remains incomplete or even impossible and the operator is likely to suffer, physically or psychologically or both, from overload stress. Workload stress not only is a direct result of task demands but also relies on how the operator perceives the task, which, in turn, depends on the operator's skill and experience. Work-related stress is an individual's emotional reaction to aspects of work demands, work environments, and work organizations that the person feels adverse and noxious.
