ECG explained: The science behind the wearable health tech revolution

What you need to know about technology for serious health tracking

Heart rate monitors are part and parcel of smartwatches and fitness trackers now, but electrocardiogram (ECG) is the new key sensor in town. Apple threw ECG into the spotlight with the launch of the Apple Watch Series 4 and it’s starting to find its way into other smartwatches too. But what is it, and why do we need it?

We’re going to break down how ECG works, why it’s considered more reliable, and how companies like Apple will seek to use it.

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