Similar trace to when my HRM strap dries out, especially when cycling. Pouring water on the contact area seems to fix it. Hard to fix during a foot race. You mustn't sweat very much.
I don't understand how the last 3/4 of the race has recorded 200+bpm in the graph and yet the log entry only has six minutes in zone 5! It's not even consistent with itself.
Amazing how closely your HR appears to follow your pace after the HR goes dodgy.
Hmm I didn't even notice that. You must have like a pattern recognitiony brain or something.