The Apple Watch tops Stanford’s heart rate accuracy study — and here’s why

In a recent study from Stanford, the Apple Watch bested six other wrist-worn devices in calculating accurate heart rate.If you’re planning on using a wrist-based monitor to track your heart rate while walking, running, or cycling, a group of scientists at Stanford (in partnership with the Swedish School of Sport and Health Services in Stockholm) claim the Apple Watch is the monitor to get, with the smallest margin of error (2%) out of seven tested devices.The experiment also looked at each device’s caloric estimations (or “EE”, for energy expenditure). Though the Apple Watch doesn’t do poorly in this arena, that doesn’t mean much: the lowest margin of error across the pack was 27.4% average, with a whopping 92.6% average error for the Fitbit Surge

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The Apple Watch tops Stanford’s heart rate accuracy study — and here’s why