Wrist heart rate monitor: Heart rate matches cadence?

Anonymous
I have a Garmin Forerunner which measures my heart rate on the wrist. On several runs, I've noticed a sharp increase in heart rate to the point where it matches my cadence? Is that what it's actually tracking?

I know chest strap monitors are more accurate, but I don't know what causes the sudden jump. Anyone else experience this?
Anonymous
I'd watch some of these videos and decide.

https://www.youtube.com/results?search_query=garmin+forerunner+heart+rate+accurate
Anonymous
I wore my garmin 4s to my stress test to check the accuracy. It was very very close to the 11 tabs monitoring my actual heart rate.
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