Heart rate

Hello all,

I do not know if this question is even answerable or if there is reliable research on the topic because of how inaccurate heart rate monitors (especially wrist worn options) can be.

I know there are a ton of variables like training history, current training, etc but is there a rough estimate of how long individuals should be able to hold 90+% of their max heart rate? Is it even possible to reach 100%?

I figured this question is a stretch but thanks for your time!

No, there is no rough estimate for how long individuals should be able to hold 90% + (a huge range btw) of their max heart rate, which is why it’s tested. Yes, people can reach their maximum heart rate.