Fitness trackers and smart watches are widely popular wearable devices that measure several types of health metrics, including step count, calories burned, sleep quality, Vo2 max and heart rate.

M odern smart watches can measure an array of health indicators. Step counts and heart rates sit at the simpler end, while ...

A few of the most important insights are heart rate variability (HRV), which describes the difference in time between the ...

Oura sold 5.5 million rings in 2025 but does the device actually make you healthier?

If you wear a fitness tracker, you've likely seen a stat labeled "HRV" pop up on your screen. But what does it mean, and does it matter? Short for heart rate variability, HRV has become a popular ...

Heart rate variability during sleep can predict stroke, depression or cognitive dysfunction years in advance, according to new research presented at the European Academy of Neurology Congress. The ...

The rhythm of a healthy heart may seem steady, but underneath that regular thump lies a rich, ever-changing pattern. These beat-to-beat changes, known as heart rate variability, or HRV, reveal much ...

We spoke to Dr Cailbhe Doherty from the Cerberus project at University College Dubin, a initiative aimed at maximising the capabilities of wearable technologies for public good ...