Effect of reanalyze and reprocess file

I added new custom activity fields and want to reanalyze and reprocess files. However, how will that effect eftp and other intervals metrics on the older activities. I need those to stay the same, so I can track progress on those, but just fill in the new custom fields like Garmin fields and Z2Runxxx elements by @MedTechCD?

Metrics (eFTP etc.) should mostly stay the same with re-analyse and reprocess file. Training zones, FTP, LTHR etc. are kept so the load shouldn’t change.

There are three ways to make changes:

  1. On the activity (only updates the activity).
    This allows a little more specific change to the activity, as can be seen in the edit (pencil icon).

  2. On the list view, by selecting multiple activities.

  3. On the list view, by selecting all activities.

The difference between the two re-analyse and reprocess is the last option: All activity streams (power, heart rate, pace etc.) will be recomputed and any edits or cropping will be undone. The difference between option 2&3 is single/multiple or all activities.

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