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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 ...
A smart watch may be under your Christmas tree this week. The nifty gadgets are advertised as a tool to help you stay healthy. But can smart watches be trusted to look out for your heart? A Maryland ...
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