Activity trackers not always great for monitoring exercise heart rate


  • TECH
  • Wednesday, 12 Apr 2017

Some people who rely on fitness trackers to see how hard they work out may want to rethink this approach, according to a small study that suggests the increasingly popular devices may get more accurate heart rate readings when users are at rest than during exercise. 

The study tested four popular wristbands, each of which has a light-emitting diode (LED) that measures heart rate from tiny changes in skin blood volumes by using light reflected from the skin. 

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