Heart-rate variability emerges as a key health indicator tracked by smartwatches
“Heart-rate variability” has been decades in the making
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Your resting heart rate could reveal more about your health than you think, doctors say
Here is what your resting heart rate reveals about cardiovascular health and when to see your doctor. Pulse checks and wearable devices can
Your resting heart rate could reveal more about your health than you think, doctors say
NEWYou can now listen to Fox News articles! The simple act of noting how fast your heart is beating while you’re at rest may be the key to m

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