How Accurate Is Your Fitness Tracker?

They're not a good fit for calorie counters.

By Lacy Schley|Monday, August 07, 2017
fitness-tracker
fitness-tracker
Martin-DM/Getty Images

If you’re relying on the gadget around your wrist to lose weight, you might need to rethink your game plan. A team from Stanford University recently investigated how good some leading consumer fitness trackers were at monitoring heart rate and calculating calories burned, or energy expenditure. After a group of 60 volunteers tested the fitness bands, researchers realized that while most of the devices measured heart rate well, they all failed to accurately gauge energy expenditure.

heart-rate
heart-rate
Source: “Accuracy in Wrist-Worn, Sensor-Based Measurements of Heart Rate and Energy Expenditure in a Diverse Cohort,” Journal of Personalized Medicine, 2017
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