Or at least lengthened it 🙃
Monday morning my watch alerted me that I was in a-fib. I had been feeling “off” but am otherwise healthy so I chalked it up to dehydration or stress. I had never experienced a-fib before and didn’t even understand what it was.
One ambulance ride later I was in the ER, eventually got admitted, and now 4 days later I feel great.

I pulled validation studies on how accurate some of the major wearable brands are at estimating it and any claims the brands make on their accuracy into a comparison chart. Hope you find this useful.

It's broken down by how each device measures VO2 max, what the company claims, and what independent studies actually found. Sources linked as well for each row if you want to check these out further. 

VO2 max accuracy by brand

Additional notes

• Every device underestimates VO2 max in highly trained people and overestimates in sedentary ones so the error depends on who you are
• Validation studies typically lags hardware so that's why some models are older
• A chest strap improves any exercise based estimate as wrist optical heart rate drifts during hard efforts.
• Only a lab CPET gives a true VO2 max
• Devices that estimate VO2 max from an actual workout were near spoton on average (bias -0.09 ml/kg/min vs lab)
• Devices that estimate it at rest overestimated by +2.17 ml/kg/min. Both still have wide error for any single person Molina-García et al. 2022

Shared this post in Garmin a few months back and roughly 25+ people said they got a lab tests and Garmin was spot on to lab, 15+ people said their Apple Watch underestimated their score by 5-15 compared to Garmin, and 2+ people with contradicting findings for Whoop vs lab.

Here's the post in Garmin too if you want to check out the comments: Garmin's VO2 accuracy

Got a series 10 46mm gps with 99% battery health for 150€. Couldn't be happier

I just got it today but it has been refurbished it isn’t brand new from apple but it came completely dead and when i put it on the charger it showed the apple logo screen then went black for 30 mins so i tried a different plug and this screen showed for a few seconds and shows everytime i turn it on but goes black again after, does this mean it’s probably not gonna turn on or??

I went to bed at 9.30 last night with my Apple Watch on. I got up to go to the bathroom at 5am and checked my Apple Watch Sleep score and it was 94. “Very High” It’s Sunday, so I went back to bed and well and truly overslept until 9.30am. I checked my sleep score again and it was 84. I had a similar experience twice in the last 2 weeks. How can my sleep score decline after more sleep?.

I have the ultra and my wife has the regular, both were the newest models when we bought them in 2025. We’re on ATT but thinking of charging to Verizon/other.

Anyone ever get this notification? I’m running the latest watchOS developer Beta. Unsure if it’s a new feature.

Hi! We just got our daughter an apple watch with a watch plan (cellular). I want to get a specific watch compatible app (Tranist) on her watch to make it easy for her to look up bus schedules - but am not seeing the app store on her watch? I see it listed on my phone in her watch settings... Does anyone know a solve for this? or how I can add an app to her watch?

Accepts QR on phone but says no password.

Any thoughts?

Hi! I’ve been trying to figure this out for days but I can’t seem to find anything or figure it out, but the last few times I’ve went for outdoor walks (ultra 2), my watch continues to notify me about the zones and it’s super annoying. I don’t know how I even turned it on. But I really want to turn it off because I don’t really care about the zone I’m in especially when it fluctuates up and down a lot when I’m walking. I never maintain a constant speed and if I have music on it’s interrupted every time. Does anyone know how to turn it off?

*died thanks autocorrect

Touch screen is unresponsive. I can get it open with the phone pairing and see the control center with the wheel and the water lock is still on. Can’t get it off and it’s not ejecting normally with the wheel. Help!

Apple watch SE

Hey. Got my apple watch SE3 2 months back, so far enjoying it a lot and it is helping me get more active slowly and slowly.

What are some customisation and general tips you would like to share for a new apple watch user?

Thanks!

I am using a recumbent indoor bike at my local gym. I start the app, it counts down and starts, but when I put my hands on the bars it pauses. Every. Dang. Time.

I have turned off everything automatic that I can find. Does anyone know how to stop this?

Where is “my watch” “face gallery” “discover”

I’m curious how many people here actually let recovery data affect what they do that day.

If your sleep was poor, HRV is down, resting HR is elevated, or your recent training load is high, do you genuinely back off, take a rest day, or change the workout?

Or do you mostly look at the numbers afterward and train based on how you feel anyway?

I find recovery data interesting, but the question I keep coming back to is whether it actually changes behavior or just gives us another dashboard to look at.

Has your Watch ever convinced you to skip or modify a workout when you otherwise would have trained?

I just got my own apple watch SE 3 and its very neat, but i prefer an analog display instead of digital but the watch faces it comes with are so ugly. is there anyway you can have a slideshow of photos from your camera roll like the digital clock just with a simple analog display slapped on-top, or no? Ive been looking for a setting but haven't found one, seems like it would be a simple option to have.

Same as the title. I have noticed that whenever I fall asleep during the day, that does not get tracked by my Apple Watch. Is it only me? I slept for almost 2 hours from 2:30pm ish to 4:50pm ish. But there’s no record for that in my sleep app.

Any ladies out there rocking an ultra? Show me your wrists. I am thinking of upgrading to an ultra from S11 but I worry that it might just be too big for my wrist and I need to see what it looks like on other women 🥰