My Garmin 935 appears to have changed my heart rate zones during a run this morning with out notifying me. The zones are hugely different from before. I can see on previous posts that this can be an issue with watches. I want to revert back but do not know what the old zone settings were. Is it possible to find out what these were? I use the info to see a general progression in VO2 max. I do not think the figures are too accurate but they are a good relative guide over time for improvement, but not it the heart rate zone settings change, as this distorts the VO2 max. Thanks
