why is hrv so different

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 9353527 over 2 years ago

Bro, you are taking about 28ms. Our heart is not a metronome.

0 allan570 over 2 years ago in reply to 9353527

keeping track of hrv is a way to tell how set you are for stress. A deviation that high would say different things about my readiness for the day.

0 9353527 over 2 years ago in reply to allan570

https://assets.firstbeat.com/firstbeat/uploads/2015/10/How-to-Analyze-Stress-from-Heart-Rate-Variability.pdf

if you have doubts about your health, go to the hospital. Don't rely so much on what a watch says.

0 allan570 over 2 years ago in reply to 9353527

Thanks for the comprehensive article. I am not worried about my healt h based on hrv but may articles tote hrv as a major way of seeing if you are recovered for a hard workout. After reading the articles I want to see what my hrv is each morning. Yesterday's readings made me wonder about my watch.