Apple Watch Ultra II showing inaccurate heart rate

Question

Level 1

16 points

Apple Watch Ultra II showing inaccurate heart rate

The past month I have experienced that my Apple Watch Ultra II show inaccurate heart rate. Today was the third time in just a few weeks. I was doing a not very strenuous warmup on a cross trainer with little resistance for 40 minutes. My bpm was between 85-95 when I checked in on the watch. My resting bpm Is typically 50-55 bpm. Since I had experienced the above mentioned problem with the watch I continuously check my bpm on the cross trainer as well and it was between 85-95. When I got off and stopped the watch I saw that I during the latter part of the workout the watch had not recorded my heart rate for 15 minutes. And when it came back the bpm was at 170-179 for the duration of the workout. And that's impossible. I'm 65+ and currently on beta blockers after a double bypass in February. So a bpm of 170 is out of the question. And I wasn't exhausted or anything. everything felt normal. And as you can see from the screen dump my bpm after the workout ended fell to 72 in two minutes.

I count myself as experienced when it comes to Apple Watch. I've worn and tested every model since August of 2017

[Edited by Moderator]

Apple Watch Ultra 2

Posted on Jul 2, 2025 12:05 PM

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Answer 1

Jul 2, 2025 12:36 PM in response to Northman

The people who are answering your questions here are NOT Apple employees. They are other Users, who Volunteer their time and energy to help you in whatever way they can. Apple provides the forum software and a place to hold the discussion, but most Apple employees are prohibited from posting here.

Readers here are good at Divergent thinking, which can be very helpful for brainstorming a solution when you are stuck. But we do not have any special way to get Apple to pay special attention to your issues.

if you want to report a [not tracked] bug, or add a feature request, you should use the feedback links:

Product Feedback - Apple

if you need resolution for you issue, you can contact Apple support. Be prepared to work with the First Responders. When they run out of ideas, you will need to advocate for yourself and ask for a Specialist to continue to work with you toward resolution:

Official Apple Support

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Answer 2

Jul 2, 2025 12:12 PM in response to Northman

• Be sure your watch is close-fitting enough that the sensors can accurately read through the exact same spot on your skin. If it is bouncing around, it can not give accurate results.

• do an EKG test to get a 'this minute' check for normal EKG AND heart rate, using different mechanism, that does not rely solely on the through-the-skin sensors.

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Answer 3

Northman Author

Level 1

16 points

Jul 2, 2025 12:17 PM in response to Grant Bennet-Alder

I've done all that. As I stated as a tech writer I've used and tested every version of Apple Watch since they were launched and I use a textile band and I know how to and where to wear it.

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Answer 4

Jul 2, 2025 12:28 PM in response to Northman

The Apple Watch Ultra is bigger and heavier than older versions.

¿is yours sitting in the same spot on your skin throughout your workout?

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