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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 ...

"Do not view HRV as a stress score, but rather as a nervous system resilience score." ...

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 ...

For HRV, you'll need a smartphone app or wearable device that can detect the subtle variations between heartbeats. Take ...