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bad historical data on Garmin Connect makes my efforts mute

One day I, for what ever reason had a bog spike in my heart rate. It was in error. Now all my performance statistics are way off. I have tried everything including deleting the days file in question, but its still screwed up

0 Wongataa over 5 years ago

Manually change the max heart rate & heart rate zones back to the previous values/something sensible. The stats will go back to normal after a enough rides with the corrected values.