Heart rate drops past 183bpm

[Eerriicc8833]

I have been training more vigorously and when my bpm gets near 180-185 it suddenly drops to 160s. I believe the boys are getting into the 190s but it's not reading correctly.

[LokeAa]

Do you know your MAX HR? And by "Know" i do not mean (220-age) "formula"? What do you mean with "Suddenly"?You are not able to ( and you shouldn't) stay at 90- 100% of MAX HR for more than short intervals. 

[Eerriicc8833]

I don't "know" my max but it's only an issue when I am doing interval
sprints. At my peak output my reader says I am around 160-165 bpm which
cannot be right, when I am around 175 before the sprint.

Any helpful links for how to find my true max hr? Thanks!

[t.parker]

@Eerriicc8833 easiest is to get chest strap (accuracy) and do all-out run to find out your max.

[KB9WNS]

Agreed with t.parker.  Get a chest strap. Optical wrist-based from all fitness trackers, all brands, do not function well at high intensity max workouts. I do HIIT workouts to max HR also. Check device compatibility before purchase.

[Eerriicc8833]

Thanks all!

[LokeAa]

@Eerriicc8833 Sorry for my late reply. To find your true max HR,I recommend this site from NTNU.