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HRV gaps during the night

olives_19
11 months ago

I have a Fenix 7S Pro SS and having issues lately with the measurements: it depends of the day, but always min gaps or lot of. 

Yesterday:

the day before 

in the watch itself there are no gaps, but because I think the way the format of the graph is in the fenix 7s pro ss, since it just continuous the line where the gaps are.

Does anyone know how to fix it? I don't have any gaps in HR measurements during the day or night.

  • 0 11 months ago in reply to Dr Phil

    Yes, I have it like that. As mentioned, I have continuous readings for HR.. is just HRV graphs which is odd

  • 0 11 months ago

    Just to bump this I have been having similar issues for about a week (starting before I received the 17.23 firmware and continuing afterwards). I reached out to support via the chat tool and was told that the engineering team would be looking at it.

    Some other associated behavior I have noticed includes wildly high HRV when using a health snapshot (2-3x what would be expected for me), checked independently using a HRM and Elite HRV (numbers would normally be much closer together). And gaps in overnight stress, though there are not sleep gaps recorded.

    I've tried soft resets several times, and physically plugging into Garmin Express which did provide an update that didn't seem present over the air (maps and something else) but didn't rectify the problem.

    Day before issues started:

    All days after look something like this:

  • 0 11 months ago in reply to olives_19

    To be fair, if the HR setting is wrong in Battery Saver then it's more likely to lead to no HRV. sleep, etc being recorded during the night. Gaps in HRV, particularly during the day will more likely be to some other factor.

  • 0 11 months ago in reply to 6634965
    6634965 said:
    I have noticed includes wildly high HRV when using a health snapshot (2-3x what would be expected for me)

    The difference could be occurring because of movement. When taking a health snapshot you are still for two minutes but during the day you are moving around. That movement could be affecting the detection of HRV. Bear in mind that HRV is being deduced from the change in the frequency of the reflected light from the skin as blood flows through the underlying blood vessels. Photoplethysmography works best when stationary irrespective of skin tone or degree of hirsuteness etc. Skin tone being less than ideal, excess body hair, or skin art can all contribute to difficulty in measuring reflected light when moving but might be acceptable for a determination when static.

  • 0 11 months ago in reply to 6634965

    This is almost exactly my experience as well with Fenix 7S Pro SS but mine started back on May 5th. Every night since, my HRV graphs have looked just like this. I bought the watch in February and had a perfect, solid graph almost every night prior to this.

    I've reached out to Garmin support and asked why the sudden change and was assured that this was "normal" and can suddenly change like this. It was recommended that I reset the watch, which I did with no change. It was also recommended that I try wearing the watch on the inside of my wrist instead of the outside, tightening the strap, or trying my other wrist. I've also tried these with no change.

    I do recall an update installing on or right around the date that this change occurred but unfortunately I wasn't paying any attention to the old or updated version at the time so I'm not sure what it might have been.

    This has been incredibly frustrating because it has affected my training status and readiness stats due to an unbalanced or low HRV ever since May 5th. I'm glad to see it's not just me, though. Hopefully we can find a solution.

  • 0 11 months ago in reply to Dr Phil

    This does make sense except for the fact that there's a change that's occurred suddenly. Historically (for a couple of years up until a week ago) overnight HRV values, Heath Snapshot values, and values from external sources like EliteHRV, or an Oura Ring, etc have all been relatively in line with each other.

    Now the Fenix appears to be overestimating by almost an order of magnitude compared to its own history and contemporaneous measurements from the other devices.

  • 0 11 months ago in reply to Onalim

    I saw a lot of people with the same issue, and they even got watches replaced and it didn't fix it. I contacted support in the NLs and they want to investigate it but I don't want to send the watch as I believe sensors are working fine (no gaps in HR, sleep etc).

    Do you also see gaps in the watch HRV graph? For me that has no gaps, but guess they just fill in the gaps.

    I suspect Garmin won't even investigate this

  • 0 11 months ago

    We have the exact same watch. I don't see any gaps in your screenshot just low dips for HRV. My graph looks similar

  • 0 11 months ago in reply to chengtu3

    Hello, you mean on my watch graph right? I think that graph just fill in the blanks/gaps. In connect I see the gaps. See example from Yesterday which was one of the worse nights (I do have complete nights before)

    in my watch

  • 0 11 months ago in reply to Onalim

    I am also glad I'm not the only one, that's why I have decided not to send my watch to be checked by Garmin. I heard people that they exchanged the watch and is still happening.

    Unfortunately, Garmin won't look at this. I noticed they don't even comment on these threads as they did before. Most probably is just a system issue or that measurements are not so exact and depending on movement or low bpm they lost connection.

    It can also be that due to the battery saver even when HR is in no change, it just doesn't record all the time. Honestly, I tried everything but there's no way to have it complete. Out of the last 15 days I have had 3-4 days with complete recordings.