How Accurate Is Your Fitness Tracker?

Source: ALEX HUTCHINSON FOR RUNNER’S WORLD


IMAGE BY DAN REDDING

We used to wonder how accurate the calorie count on treadmills and ellipticals was. (The answer: not very.)

Now we have more sophisticated devices that track our every move, but the question is still the same: How much can we trust the numbers?

Researchers at Japan’s National Institute of Health and Nutrition recently ran an impressively detailed study to compare 12 different wearable devices, including the Fitbit Flex, Jawbone UP24, Misfit Shine, Garmin Vivofit and Withings Pulse O2, to two widely accepted methods of estimating calorie burn.

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