Heart rate variability (HRV) is the variation in the time between two consecutive heartbeats over a specific period. Doctors may use HRV as an indicator for certain aspects of a person’s health ...
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What Heart Rate Variability Means on Your Fitness Tracker—and Whether It's Worth Paying Attention ToWhat Is Heart Rate Variability? Heart rate variability is the variance in the timing between each heartbeat, says Dr. Mo. She explains it this way: When you are at rest, your hear ...
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