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jim1985-
I knew you were, but just in case you don't believe me....
the bottom image is the same section of road where you cna see, 10th May, power meter working fine, 25th July, my heart rate was 10bpm higher, I was going 2kph faster, but doing 64w less apparently....
this alone isn't perfectly conclusive, and there were other factors at play, but its generally consistent with the other data I was seeing at the time...
the top image was a series of 10 mile time trails, the red are, I believe correct, the top seems to be way down on power for the HR and resulting speed...
Sainsburys_Ed
yes, id presume that too, I went through a phase where I didn't remove the batteries and it was under reading chronically, probably to about the tune of 60w based on a time trial I did at the time. was tearing my hair out trying to work out what had happened to my legs!