Friday, March 19, 2021

What Is Heart Rate Variability (HRV) on Apple Watch, and Why Does It Matter?


Heart rate variability (or HRV) is the latest hot health measurement. It’s being used by athletes to optimize their training, and as a predictor of health—including in a number of studies on COVID-19. Your Apple Watch tracks it automatically. Here’s what you need to know about it, and why it matters.

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