Changes

This scale was based on earlier work where it was noted that there was a correlation between heart rate [[Heart Rate]] and perceived exertion. Based on this observation, Borg created a scale that roughly equates to 1/10 the heart rate [[Heart Rate]] of the healthy middle-aged male. This scale starts at 6, as 60 is roughly the resting heart rate [[Heart Rate]] of a healthy individual. The top end of the scale is a 20, which again approximates the maximum heart rate [[Heart Rate]] of 200. (Note that actual resting and maximum heart rates vary a lot and the values of 60 and 200 are broad generalizations.)

|11||Fairly light||Walking steadily, but not enough to noticeably change your breathing[[Breathing]].

|13||Somewhat hard||Steady state, but okay to keep going. [[Breathing ]] increased noticeably, but not "out of breath"

|15||Hard||Swimming or cycling hard enough to make breathing [[Breathing]] harder and raise heart rate[[Heart Rate]].

The Borg CR10 Scale is more useful for statistical analysis than the Borg RPE. On the CR10 scale, twice the rating is likely to be twice as hard. While the Borg CR10 scale does not correspond with any physiological measures such as heart rate[[Heart Rate]], this is not really an issue in practice. While this scale has a maximum value of 10, Borg's definition says that it is acceptable to use greater numbers if the subject so desires.