22 Nov Forbes: What Does Heart Rate Variability Tell Me About My Health?
Unlike heart rate which measures the number of time the heart beats per second, HRV is the measure of the variation in time between each heartbeat aggregated over time. The first step of measuring HRV is computing a time series of beat to beat distance (NN), from either an electrocardiogram (ECG) or an optical photoplethysmograph (PPG).
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