How to measure HRV on a Garmin without a chest strap
Marco Altini, PhD on Twitter: "Here is some heart rate variability (HRV) data collected using Garmin's Fenix 7, which offers an HRV spot check TLDR: Well, do not rely on this device
HRV Analysis | Garmin Connect IQ
Garmin - What is HRV status? The new Forerunner 955 determines your status by classifying information proceed into either balanced, unbalanced low or poor. Read more here: https://linktr.ee/garminsa | Facebook
Forerunner 955: HRV Status is finally enabled after 16 days : r/GarminWatches
What is Heart Rate Variability (HRV)? | Garmin Customer Support