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@Bad_Science
I'm still alive, anyway. I gave myself a day off today, just in case, but my resting heart rate is 35bpm so I recon I'm prob ok. I did have quite a lot of coffee yesterday, which can trigger palpitations.
Looking at the graph. I was riding for 30 minutes normally before the event, and things went screwy when I was weaving in and out of very slow moving traffic. My average speed comes right down as I ease off the gas, but then I have to go up the hill from Kings Cross on York Road, so the HR doesn't drop. It is only when I turn left at the top of the hill and freewheel down Agar Grove that the HR falls back to everyday levels. In total, the abnormal part of the graph lasts about 8 minutes.