heart rate sensing

Apple Watch already has 264 health apps, unused pulse ox functionality, and a hospital pilot
By Jonah Comstock | 09:29 am | April 27, 2015
Fitbit commercially launches heart rate-sensing Surge and Charge HR
By Jonah Comstock | 05:00 am | January 06, 2015
Was Apple Watch's health sensor team held back by battery concerns?
By Brian Dolan | 12:47 pm | September 10, 2014