Inaccurate heart rate measurement at peak of workout-Versa

[chugalug]

So this "problem" is based off a small sample size (2 workouts), but I'm interested to see if anyone else is experiencing a similar issue. The past two days, I have had almost identical workouts of 35 minutes interval hill training on the stationary bike (90 rpm on flats; 110 rpm on hills). During both workouts the recorded heart rate dropped suddenly, and for only a moment, at the very peak of my workout:

I did not experience any physical sensations that would suggest an actual drop in my heart rate, so I am guessing this is an issue with detection. I have the charcoal special edition, and I swapped the woven band for the classic band for my workouts. It fit snugly but not too tight. I do not have an alternate heart rate measurement for comparison.

Moderator edit: added label

Moderator edit: updated subject for clarity

[courageousrobot]

It's an optical HR reader, they're not accurate like chest straps or the nicer armband readers.

To be honest, your results are pretty darn good for a fitness tracker using an LED - you should be pretty happy your results were that consistent even with that sharp drop. Most people have issues getting accurate results during strenuous workouts.

[chugalug]

I have actually been very impressed with the heart rate sensor so far! That is why this particular blip in my readouts stood out so much. My guess is that the sensor particularly struggles at very high bpm.