Indianapolis, IN - July 28, 2013 - Indianapolis Motor Speedway: Clint Bowyer (15) competing in the NASCAR Sprint Cup Series 2013 Crown Royal Presents the Samuel Deeds 400 at the Brickyard (Photo by Phil Ellsworth / ESPN Images)
NASCAR drivers have been officially allowed to use biometric devices to measure heart rate while driving for the first time this year, and have had mixed feelings using the devices.
Devices eligible for use are certain models made by Garmin, Misfit, Polar, Samsung, TomTom and Jawbone. The wrist-worn devices may not transmit data or connect to the vehicle and must operate on an internal battery, and they can be used during races.