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 ...

These days, it may seem like there’s a million different data points that you’re supposed to keep track of—hello, steps, sleep, and recovery scores!—and it’s difficult to know which ones are worth ...

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 ...

To live is to have a heartbeat, which is why it makes sense for us living things to have a good understanding of our ticker. It’s well-known science that our hearts beat faster when we exercise and ...