I’ve noticed a significant inconsistency in the way the ForeRunner 955 performs certain calculations,
especially when the watch is not worn at night and is only used for running. In these cases, the device generates values that do not reflect reality,
such as those related to heart rate reserve or fitness age.
The issue is compounded because these incorrect values serve as the basis for other metrics — such as recovery status or training suggestions —
which ends up affecting the entire chain of calculations. In the end, the results lose coherence and the recommendations stop making sense.
I believe Garmin should review this behavior or introduce an option to adjust the calculation mode when the device is not used continuously, particularly during nighttime rest.