ECG wearables: The current state of play

Here’s what you need to know about the heart rate monitoring tech

Heart rate monitors on wearables are no longer a rare thing. Smartwatcheslike the Apple Watch or the Samsung Galaxy Watch have them. Most fitness trackers pack them, too, from high end ones like the Fitbit Charge 3 down to budget options like the Xiaomi Mi Band 3. They’re even starting to turn up on fashionable wearables like Fossil’s clan of Wear watches.

Generally, all of these heart rate monitors are based on the same technology. We’re talking light-based optical tech (PPG) that uses flashing LEDs that penetrate the skin to detect blood flow.

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