heart rate sensing

Mayo Clinic's Apple Watch app for doctors As the Apple Watch begins to find its way into the hands of consumers, it's also becoming clearer that there's a lot of interest in the health features of the device.

The new heart rate-enabled devices Fitbit announced in October have begun shipping and are now available for purchase online, the company announced.

The Apple Watch, announced on-stage at an event in California yesterday, didn't live up to the rumors that it would offer advanced health sensing -- rumors that built up around the "iWatch" thanks to months of reports about Apple's growing team of medical sensor experts.