Could the secret to improving your sleep, spotting the early signs of illness and staying slim and happy lie in monitoring your pulse constantly — using just a shop-bought fitness tracker?That’s the promise being made for an increasingly popular health strategy that focuses on the fact that our pulses can vary from heartbeat to heartbeat by a matter of milliseconds.This subtle shift in pulse timing is called heart rate variability (HRV). HRV is something that’s long been measured in medical settings with an electrocardiogram — using sensors attached to your chest to check the heart’s electrical activity.
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