In recent studies, the supplementation of Vitamin K2 - 7 improved cardiac output by 22 % at resting heart rate and 12 % at maximum heart rate. (microbiomelabs.com)
Like its predecessors, it has no display, but adds new sensors that can measure resting heart rate and tell the difference between light, deep and REM sleep. (pcworld.com)
The first is an enhancement to the heart rate app, which you can now see on your watch face and for the first time, tracks resting heart rate. (thenextweb.com)