Key points from article :
Researchers from the Cleveland Clinic tested Apple Watch, Fitbit Charge, Mio Alpha, and Basis Peak.
Wearables and fitness trackers don’t generally fall under regulatory oversight.
Subjects wore devices on a treadmill and compared results to an EKG.
Apple Watch and Mio Fuse had the most accurate heart rate tracking.
Most variability and largest errors in heart rate clustered in the mid-range of heart rates.
Small study of 50 healthy patients.
The study was published in the JAMA Cardiology journal.
