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 ...

Oura reports that heart rate variability (HRV) measures the variation in heartbeat timing, reflecting stress levels and ...

Stress is an imprecise term and a difficult thing to measure. But technological advances mean it’s now simple to capture what is perhaps the best proxy for our response to it: heart rate variability, ...

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 ...