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عمومی::
تغییرپذیری ضربان قلب
is called heart rate variability (HRV) and offers a sensitive record of relaxation
We usually measure HRV using a device that senses pulse waves in the blood
_is is an easy way to record HRV as
Heart rate variability is a much more useful method
Device to measure heart rate and HRV, recording autonomic nervous activity
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