What it measures and which versions exist
The scales developed by Gunnar Borg relate sensations of exertion to values and descriptors. RPE uses a range from 6 to 20; CR10 belongs to a family of category-ratio scales. They are not interchangeable ways of recording the same result: each has its own instructions, references and uses. The version used should always be identified.
Its role in prevention
In a pushing, gripping or handling task, knowing perceived exertion helps identify difficulties that a photograph of the workstation might conceal. It can be used when comparing tools or task modifications within an assessment led by competent staff. If an ergonomic method prescribes a particular scale, that version and its procedure must be followed.
Choosing the instrument is part of selecting the ergonomic assessment methods available for each exposure.
How to collect a useful response
Before asking, explain which sensation is being rated: overall exertion or a localised demand, according to the protocol. The person should know the instructions and respond about a defined task and moment. The assessor records duration, pace, tool and working conditions. Suggesting a score or showing colleagues’ responses introduces avoidable bias.
How to interpret results
The value describes a perception; it does not directly measure kilograms, muscular force or damage. A change may relate to a different tool, accumulated duration, learning or other conditions. Retaining context is therefore more useful than ranking workers. The response does not replace measurements or establish medical fitness or absence of risk.
Application example
In a hypothetical example, a team trials two handles for a repeated operation. Grip is observed and perceived exertion recorded using the same instructions after comparable periods. One option appears less demanding, but the team also checks that it does not increase wrist deviation or errors. The decision combines these data with participation by the people using the equipment.
Mistakes to avoid
An informal zero-to-ten scale should not automatically be treated as a validated Borg scale. Nor should RPE automatically be converted into an individual heart rate, or an isolated score used as a universal limit. Before reproducing or incorporating the instruments into forms, review the rights holder’s conditions of use. This entry explains the concept without reproducing the protected questionnaire.
