Oura reports that heart rate variability (HRV) measures the variation in heartbeat timing, reflecting stress levels and recovery. Higher HRV indicates well-being, while lower HRV signals stress.

Why the wild freakish heart rate and HRV scores Van der Poel discussed in a recent podcast mean everything and nothing, all at once.

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 ...

Heart rate variability can tell you whether to take it easy or aim for maximum intensity to achieve optimal results – but only if you measure and interpret it properly.

This American Heart Month, cardiologist Dr. Nidal Ganim explains how smartwatches and rings can track your heart health and ...

When one partner is stressed, the other feels it too—not just emotionally, but on a biological level. New research on heart rate synchronization helps explain how.

A recent study showed that the heart rate variability of a dog and its owner adapt to each other during interaction. High heart rate variability is associated with relaxation, while low heart rate ...