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What heart rate variability means on your fitness tracker—and whether it's worth paying attention to
Here’s what this health metric really indicates, according to cardiologists. Fact checked by Isaac Winter Reviewed by Vivek Cherian, MD Heart rate variability (HRV) is the difference in the timing ...
Please provide your email address to receive an email when new articles are posted on . Adults with chronic insomnia had more variability in several measures, like sleep latency, vs. good sleepers.
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