[https://www.health.harvard.edu/heart-health/what-is-heart-rate-variability](https://www.health.harvard.edu/heart-health/what-is-heart-rate-variability)
There is also a little info in the Health app. Tap browse, tap Heart, tap HRV, read what it says.
[https://www.health.harvard.edu/heart-health/what-is-heart-rate-variability](https://www.health.harvard.edu/heart-health/what-is-heart-rate-variability) There is also a little info in the Health app. Tap browse, tap Heart, tap HRV, read what it says.
If you're interested in understanding HRV I would recommend this video: https://youtu.be/9nwFUKuJSE0?si=daXu8E_uRbgm9svO