Heart rate variability (HRV) is the variation in the time between two consecutive heartbeats over a specific period. Doctors may use HRV as an indicator for certain aspects of a person’s health, ...

What is heart rate variability (HRV)? As popular as the metaphor may be, a healthy heart doesn’t beat as regularly as a metronome. In fact, it changes its rhythm with each beat. Heart rate variability ...

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. As a ...

Smartwatches commonly use heart rate variability to monitor stress. Columnist Helen Thomson explores what this metric ...

This is the ultimate heart rate variability deep dive—nuanced, practical, and funny. I'll even share a story involving Andrew Huberman, Starbucks, and my girlfriend’s friend seeing my butt.

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 ...

Did you know there’s a number that might let you know how stressed you are, whether you have a cold coming on and how to get into the zone if you’re about to present at a big meeting? You can find ...

Ready to take your training to the next level? Here are the best heart rate monitors to track your fitness and health goals from WHOOP, Garmin, Oura, and more.