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Heart rate variability (HRV) is the physiological phenomenon of the variation in the time interval between consecutive heartbeats in milliseconds. A normal, healthy heart will have a higher HRV than an unhealthy heart. A good HRV score is relative for each person. HRV is a highly sensitive metric and responds uniquely for everyone. As a rule of thumb, values below 50 ms are classified as unhealthy, 50–100 ms signal compromised health, and above 100 ms are healthy.
