Old 07-22-21, 08:46 PM
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Similar to their VO2Max estimate, Performance Condition appears to be based on the relationship between heart rate and power output, and is also "gameable" the same way - doing low cadence intervals, which tend to result in lower heart rates compared to high cadence intervals at the same power, typically make the Garmin think that you're doing better, and reports a higher Performance Condition score.

Well, at least that's applicable for short term stuff. In the longer term (e.g. several hours or longer), that HR-to-Power comparison can become more relevant and indicate fatigue or early bonking warning system, since generally as you get more tired your HR is likely to be higher for the same power output, in relation to how you were at the beginning of the ride.
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