Apple Watch not Accurate

JosFKirby · Nov 28, 2022

I'm testing the heart rate from apple watch (Series 7) against Cardiac Rehab results and getting poor results. Examples of issues include the watch showing a heart rate of 125 while rehab monitors show 109. At others times, the watch will not display a heart rate, just a question mark.

I've contacted apple support, upgraded the watch as requested, tested different band tensions, and had them perform diagnostics. Their final response was to read me a disclaimer and state that the "watch is working as expected."

Has anyone had better results with the Apple watch?

How about a heart rate monitor strap that is compatible with the Apple watch?

Thanks,
Joe

elMIguel · Nov 28, 2022

Interesting. I have a Series 6 and I've found it to be spot on. I have an indoor rower and at first I was using a Polar HR strap. After 2 months I decided to ditch the Polar because my Apple Watch was mirroring the data I was getting from my heart rate strap. FWIW, I've noticed that if my watch strap is too loose, my results are not accurate.

skier · Nov 28, 2022

A heart rate strap is going to be more accurate than a watch on the wrist. Both will have some errors, but a watch will frequently be inaccurate when moving, while a strap will be correct most of the time.

Whichever you use, it's good to get familiar with your heart rate based on RPE and measuring your pulse on your neck so you can ignore spurious readings from your heart rate monitor.

Protimenow · Dec 28, 2023

I have an Apple Watch 7, and was looking for a strap that may be more accurate and isn't confused by my arrhythmias.

My pacemaker is set at 85 bpm - my heart rate can't drop below 85 for more than a few seconds at a time.

My watch often shows a rate of about 45 or so (as does my blood pressure monitor) - again, I think, because the arrhythmias make it hard to check actual heartbeats.

I got a Shosche strap, hoping that it would do a better job - it doesn't. Inf act I'm not even sure WHAT it's measuring. For the last half hour, it's been giving a consistent, unchanging, rate of 72 (my watch shows 86, and is probably pretty accurate).

So - here's my conclusion, such that it is -- a monitor - watch, strap, or BP machine - may be accurate for you if you don't have an arrhythmia. For certain arrhythmias, they may be of little value.

(Hey, if my plan will get me an Apple Ultra, I certainly wouldn't complain)

ClaudetteLeanna · 2024-12-19T04:03:04-0500

If arrhythmias or other health conditions are involved, even a chest strap can struggle to give consistent results. Sometimes it’s just about testing a few options to see what works best for you.
In the meantime, if you’re into watches in general and looking for something outside of smartwatches, I’ve been checking out some super fake watch options lately. They’re great for those times when you want a classic look without worrying about all the tech.

Protimenow · 2024-12-19T04:54:34-0500

I'm finding that a smart ring (NOT from a major supplier) -- one that I got for less than $30, does a pretty good job detecting heart rate, blood oxygen, and heart rate variation (in addition to sleep and activity). I bought two -- one was wildly inaccurate. The other, on my finger as I type this, does a pretty good job. Because it's on the finger, rather than around the wrist (and subject to errors depending on how tightly it fits), it seems to do a better job of data collection.

It also doesn't seem to be quite as sensitive to arrhythmias than my Apple Watch 7.

Send me a private message if you want to know more about my smart ring (I have a size 8 that's too small for me) and an extra size 11 if any of you are interested. These are really inexpensive--but one of the two I got seems to be quite accurate.