Next, we get into the newest feature – stress tracking. Within this, the unit will utilize the optical HR sensor and heart rate variability to track your stress while not in a workout. It does this constantly, like every few seconds constantly. It’ll then give you a score between 0 and 100, as well as a general bucket (Low/Medium/High)
...
I’m actually more impressed with this than I would have thought. At first, it seemed gimmicky, but then I broke down one of my days and it pretty much nailed what I was feeling from a stress standpoint throughout the day.
And
I just got confirmation from Garmin that the new Stress metrics will indeed be coming to the Fenix5 and FR935. They haven’t yet finalized a timeline for that, but it’s in the plans.
https://www.dcrainmaker.com/2017/04/garmin-vivosmart-3-activity-tracker-in-depth-review.html
