Rating of Perceived Exertion (RPE)
The most common RPE scales are the Borg 6-20 and Category-Ratio Scales.
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Borg 6-20 RPE Scale
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Category-Ratio Scale
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| 6 | No exertion at all | 0 | Nothing at all | |
| 7 | Very, very light | 0.3 | ||
| 8 | 0.5 | |||
| 9 | Very light | 0.7 | ||
| 10 | ‘Conversational pace’ | 1 | Very weak | |
| 11 | Fairly light | 1.5 | ||
| 12 | Weak | |||
| 13 | Somewhat hard | 2.5 | ||
| 14 | Moderate | |||
| 15 | Hard | |||
| 16 | Strong | |||
| 17 | Very hard | 6 | ||
| 18 | Very strong | |||
| 19 | Very, very hard | 8 | ||
| 20 | 9 | |||
| 10 | Extremely strong | |||
| 11 | ||||
| * | Absolute maximum | |||