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HRV as shown in health snaapshot

I have the Garmin fr945 lte with 4.1.6 software. My question has to do with health snapshots and hrv. THis morning I took two health snapshots , one right after the other. I was lying in bed on my back. WHile Ave SPO2, Ave ressp, and ave stress were the same, hrv (the one I am interested in) varied greatly. It was 61 and then 89 3 minutes later.

Does this mean, measuring hrv on the garmin is useless or something strange happened on the one reading.

Below is a screenshot from the app.

0 jmto over 2 years ago

There is own forum for the 945 LTE. https://forums.garmin.com/sports-fitness/running-multisport/f/forerunner-945-lte

We don't even have that feature.

0 e7andy over 2 years ago

945 doesn't have that feature so I can't test it. But my thought about it is that the HRV will be different for every measurement when you measure in such a short time period. We are talking about 28 ms difference here which isn't a lot. Normal HRV is from below 20 to over 200 millisecond according to: https://ouraring.com/blog/what-is-heart-rate-variability/

HRV is by definition the variability of the time between heart beats so it can't really be the same between each measurement.

Why no other values changed is probably because they measure over a longer period of time so small variations will disappear.