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Forerunner 935 Problems with wrist-HRM / sensors?

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Problems with wrist-HRM / sensors?

Former Member over 7 years ago

Hi all,

I decided to upgrade my old 310xt and bought the FR935, which is a massive upgrade and a nice one. I've owned it for 3 weeks now and been collecting data almost 24/7, but noticed some problems (?) with my device (running FW 6.00). I didn't notice at first, but the other day it was quite easy to tell that something was wrong, as my pulse and "movement" graph was constant almost all day, and suddenly starting to record again (photo from 22 sep).

Then I started to look closer to my recordings and saw how recording suddenly went off for 2-10 min, leaving holes in my graphs. Another run had a very low resolution on the HR and showing no movement at all.

Did anyone experience the same or having suggestions?

Hans

ciq.forums.garmin.com/.../1255226.png ciq.forums.garmin.com/.../1255227.png ciq.forums.garmin.com/.../1255228.png ciq.forums.garmin.com/.../1255229.png

0 Dr Phil over 7 years ago

Many, many posts from people experiencing the same problem. Do a search and you'll find many like minded people.

0 smbkrun+3 over 7 years ago

I'm a heavy sweater and the OHR is horrible when I'm running, I use the HR strap instead. I can get a fairly accurate reading using the OHR while cycling.

0 Dr Phil over 7 years ago

Here you go - https://forums.garmin.com/search?searchJSON=%7B%22keywords%22%3A%22heart+rate%22%2C%22title_only%22%3A1%2C%22sort%22%3A%7B%22lastcontent%22%3A%22desc%22%7D%2C%22channel%22%3A%5B%22542%22%5D%2C%22exclude_type%22%3A%5B%22vBForum_PrivateMessage%22%5D%2C%22ignore_protected%22%3A1%7D

Read some of these.

0 chrisdr2 over 7 years ago

I'm a heavy sweater and the OHR is horrible when I'm running, I use the HR strap instead. I can get a fairly accurate reading using the OHR while cycling.

Me too - I get around it by tightening the strap by a notch or two before starting the activity. I tend to use the strap for more extreme activities, such as interval training.

0 Former Member over 7 years ago

Here you go - https://forums.garmin.com/search?searchJSON=%7B%22keywords%22%3A%22heart+rate%22%2C%22title_only%22%3A1%2C%22sort%22%3A%7B%22lastcontent%22%3A%22desc%22%7D%2C%22channel%22%3A%5B%22542%22%5D%2C%22exclude_type%22%3A%5B%22vBForum_PrivateMessage%22%5D%2C%22ignore_protected%22%3A1%7D

Read some of these.

Thank you for the link, but by quickly glancing its about inaccuracy - I'm aware that wrist recording never will be perfect. I'm not sure if my problem is inaccuracy, as it records same value for 20 hours or loose connection. Considering to buy a HR-strap, but time will tell.

0 Former Member over 7 years ago

Anyone ever tried this one to find answers for the Optical on each Garmin Connect?

0 Former Member over 7 years ago

Anyone ever tried this one to find answers for the Optical on each Garmin Connect?

It explains about the accuracy but not really the "same reading for 20 hours" or stopped recording.

While our wrist HR monitor technology is state of the art, there are inherent limitations with the technology that may cause some of the heart rate readings to be inaccurate under certain circumstances. These circumstances include the user?s physical characteristics, the fit of the device and the type and intensity of the activity as outlined above. The HR monitor data is not intended to be used for medical purposes, nor is it intended to diagnose, treat, cure or prevent any disease or condition.

Wrist heart rate accuracy during swimming is very limited. Garmin does not recommend using wrist heart rate during swimming activities and on some products, wrist heart rate monitoring is disabled while swimming. Garmin recommends using HRM-Swim? or HRM-Tri? heart rate monitors with compatible devices to track heart rate while swimming.

0 FlipStone over 7 years ago

The gaps (no recording) can be simply that it can't get a proper HR... I sometimes have that as well, usually means the watch is a bit loose or tilted (because it's in a tight sleeve, or when lying in bed, or something like that). OHR is a tricky thing....

The 'fixed value' is weird though, remember an issue with 5.40 FW where it kinda happened during activities. I had an issue with even older firmwares where, after connecting/charging to a pc and unplugging, the OHR was messing up as well. Either fixed values, no value at all.

How long ago since you restarted the watch? If there is a glitch with the OHR that usually fixes things for me.

0 Former Member over 7 years ago

Hej Hans,
you own it 3 weeks, so I suppose you have upgraded to 6.0 recently ... have you tried (I hate to suggest that ;)) a factory reset? Wiping off old rotten data helped my problem with OHR significantly ... Otherwise if that recordings gives you sleepless nights, I'd return the watch for warranty ...

0 Former Member over 7 years ago

The gaps (no recording) can be simply that it can't get a proper HR... I sometimes have that as well, usually means the watch is a bit loose or tilted (because it's in a tight sleeve, or when lying in bed, or something like that). OHR is a tricky thing....

The 'fixed value' is weird though, remember an issue with 5.40 FW where it kinda happened during activities. I had an issue with even older firmwares where, after connecting/charging to a pc and unplugging, the OHR was messing up as well. Either fixed values, no value at all.

How long ago since you restarted the watch? If there is a glitch with the OHR that usually fixes things for me.

Thanks for the info. I restarted the watch recently due to the new firmware, but I'll try to keep an eye on the recordings for the weeks to come