Whenever I'd see those weird data points with my wrist-based heart rate while running I'd think to myself that it was either a sensor sampling issue or maybe some weird thing with acceleration. I never really studied it though. Turns out it's something called cadence lock. Maybe I'll go back to using a chest strap again for runs. #running
https://runningwritings.com/2021/05/cadence-lock-why-gps-watches-have-hard.html