Fat Daddys - Heart Rate Variability ( HRV ) is a statistical measure of the specific changes in time between successive Heart Beats. Garmin HRV Status is taken while you sleep and
HRV Status | Garmin Technology
Garmin Previews HRV Status on the Fenix 6 Series Watches | DC Rainmaker
Guide: HRV scores and running training – When am I ready to train hard? - Inspiration