You are right, they probably should name it differently, or at least add disclaimer on the method of how HRV is measured to avoid being compared with other devices. I have now had the watch for half a year or more and found the measured or estimated HRV if you will, is very consistent and reliable.
There is a very fine correlation when i had too much wine the night before and a significant drop in HRV, it will peak when i actually do feel well rested after a good long nights sleep. We just sold our house and signed a contract on a new house, which didnt pass without some very stressfull days, resulting in a measured HRV on Sense going down. What I am saying, it correlate fine with periods where i feel stressed, unfortunately havent been sick and can say how it will behave.
And once more, dont compare this to measurements from other devices, or at least make sure that the results from other devices are made during sleep, and not over 24 hours period or short sport measurements during day. Compare the results on the Sense with your own earlier measured data. It is a better indicate on stress and sickness compared to using resting rate, where RHR go up a few bmp, HRV will drop with a higher amound compared to your normal level. Its an altenative indicator to RHR for gauging your restitutaion and stress levels.
Have ditched Fitbit and prefer Garmin
