Where RPE Originated: RPE is actually an updated (and simpler) take on the original Borg Rate of Perceived Exertion scale, which went from six to 20 and was much more correlated with heart rate ...

A 2024 study published in Sports Medicine-Open found that when over 6,000 participants using stationary cycles or treadmills used the Borg scale of RPE (from six to 20), it was a reliable ...