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Garmin Connect HR Inaccurate

Former Member over 5 years ago

I have Vivomove HR, the HR in comparison to medical grade device is very accurate. But the Garmin Connect is way off, I did a 20min workout and on Connect the Activity record for the workout said high HR was 159, this was what I was seeing on the watch. However, the HR for the day in Connect said high HR for the day was 143. Anyone else find this issue really annoying and kind of makes the software (Connect) quite useless.

0 trux over 5 years ago

Where exactly do you look in Garmin Connect? There are several High HR values:

Health Stats » Heart Rate » Averages » High (bpm)
Health Stats » Heart Rate » date of given day » High (bpm)
Health Stats » Heart Rate » date of given day » activity » HR tab » Maximum

As the name suggests, in the first case, the Resting and High HR values are averages (in the case of the daily report, averages over an hour), hence not showing the min and max extremes, rather just the low and high values normalized for each hour.

In the second case, the data grid is finer, and hence also the resting and high HR values closer to the extremes you could see on the watch, but still they are averaged over the period of 1 minute.

The values in the third case have the finest resolution - they are recorded with the frequency up to every second, so the low and high HR values should be already very close to the extremes you could observe live on the watch. Still, there can be a small discrepancy - imagine you have a irregular HR, where the HR value between two beats jumps 160 bpm, but then sets back to say 155 within the same second - in that case, although you may have spoted it on the watch, the maximum value would not be recorded. And it is good so.

0 Former Member over 5 years ago in reply to trux

Hi Trux, I use second scenario, and it is still 16bpm out.

The workout was near 20 min and I held b0m at high 150s for nearly half of that work out.

I have reported this previously to Garmin, all the way to sending data logs and giving them full access to device, app and smartphone.

Only response was we could not find the issue and they continue investigate. That was over 6mths ago.

I have asked for update monthly, where I would either receive a , we are still investigating or I would get no response.

Just very frustrating, and makes the data kind of useless.

0 trux over 5 years ago in reply to Former Member

I use second scenario, and it is still 16bpm out

As I wrote, the second scenario still uses rather long averages, so theoretically it is possible, if the HR was not continuousy higher. You'd better see it with the third way. Or just share the link to the concerned activity here, and I'll check the detailed backround raw data, and tell you perhaps more where the problem is.