Watch HR not accurate during treadmill stress test?

I have had two treadmill stress tests recently and my Apple Watch series 3 did not pick up my high heart rates either time. Both times I was hooked up to a 10 lead EKG and my heart rate rose into the 170's. On both occasions though, my watch only picked up my HR as being in the 120's. Why would this be the case? This is concerning as it makes me wonder about the accuracy the rest of the time...

Apple Watch Series 3

Posted on Mar 12, 2018 1:59 PM

Similar questions

HR not monitored at the beginning of a workout The first 20 minutes of each workout, my apple watch is barely monitoring the heart rate. It is always trying to measure it, but in the end it's just reporting no rates or very few rates. After that time passes though, it is always working just fine and accurately.
757 6
Apple Watch is not accurately reading my heart rate My Apple Watch is not reading my resting heart rate , and sometimes RHR is way higher than my actual HR [Re-Titled by Moderator]
1003 1
Apple Watch Series 4 Heart Rate Spikes I got my watch in Nov 2018. From the beginning the heart rate is always initially wrong, saying 150 then settling down to a more reasonable 74 bpm. Like right when I get up it says 150 and sets that as the highest rate and then settles down to 74. I will wear my twenty dollar finger monitor to check against the watch and it and it always says just 74. Sometimes while driving or riding on the bus it spikes to 210 or 250 bpm, which is a ridiculous and impossible heart rate for me, especially while sitting on a bus. My normal resting is 54 and average walking is 85. I have a few monitors and check against them regularly. My question is, does the heart rate pick up on bumpy cars/busses? Seems like it should not be sensing things like that. Also, what is Apple doing to prevent these spikes?
2552 3

There are no replies.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.