According to a patent, Garmin is working towards integrating more some helpful technologies in its future smartwatches. While many smartwatch manufacturers have brought blood pressure sensors to market, Garmin hopes to give people the option of monitoring their energy levels when driving.
https://www.notebookcheck.net/Upcoming-Garmin-smartwatches-should-measure-blood-pressure-levels-and-combat-driver-tiredness.574459.0.html