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Besides measuring heart rate and other metrics like steps, pretty much every fitness tracker and smartwatch measures heart rate variability, abbreviated as HRV. This measurement is the basis for recovery scores and stress readings, and you can usually find it as a standalone measurement in the “vitals” section of your chosen app. So let’s break down what this number actually measures, and how to interpret yours.

HRV is heart rate variability

HRV stands for heart rate variability, but that doesn’t mean what you might think. HRV is not related to your heart rate changing throughout the day or during exercise. (Your heart bea

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