physical or mental demand of the job
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Physical demands refer to the level and duration of physical exertion generally required to perform critical tasks in support of critical job functions, for example - sitting, standing, walking, lifting, carrying, reaching, pushing, and pulling.

https://www.bls.gov/ors/factsheet/visual-overview-of-physica...


Mental demands
There are a number of ways to manage work that requires lengthy periods of concentration. Where possible:

rotate tasks and schedules so that workers are not always assigned jobs that require an extreme focus of their attention
give workers some control over the way they do their work including work pace and order of tasks Refer to Tip Sheet 6 – Levels of control.
allow sufficient time for breaks
For work that requires complex and high-level decision making:

provide sufficient information to enable workers to perform tasks competently, including adequate support and resources for decision-making
provide additional practical assistance when workers are doing challenging tasks
allow workers sufficient time to perform the tasks assigned and provide suitable equipment which is appropriately maintained
evaluate and review workers’ competency and capability and provide additional training where needed
have systems in place to support workers when they are required to make difficult decisions or when there are negative consequences to decisions they have made (eg child safety workers)
Physical demands
Manage environmental hazards such as noise, vibration, poor lighting or poorly designed equipment
Make the physical environment as comfortable as possible and designed specifically for the tasks being undertaken (eg make changes to the work station, tools or equipment, or the way a job is done where needed)
Where practicable allow workers to take regular breaks away from physically demanding work and rotate repetitive tasks between workers
Ensure workers are well trained and capable of undertaking the required tasks
Refer to the Safe Work Australia Guide for managing the risk of fatigue at work for practical information about managing fatigue in the workplace.

https://www.safework.nsw.gov.au/resource-library/mental-heal...

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Job demands are all physical, psychological, social or organizational aspects of a job that require continuous physical and/or psychological (i.e., cognitive or emotional) effort [2]. A job demand may lead to positive as well as negative outcomes depending on the demand itself as well as on the individual’s ability to cope with it. Positive responses may be motivation, stimulation or job-satisfaction while negative responses can be depression, anxiety or burnout. Job demands have been identified as one of the most common sources of work-related stress [3]. Long work hours and demanding work shifts, high time pressure, ergonomic problems and unpleasant physical conditions, for example, have a high risk of leading to stress and negative long-term consequences. The negative short- and long-term effects of such demands may be buffered by job resources like control over the work process or just gratification for achievements.

https://oshwiki.eu/wiki/Job_demands#:~:text=Job demands are ...