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12. RMSSD |
An important measure of the Heart Rate Variability. RMSSD is the root mean square of successive RR interval differences. It reflects the beat-tobeat variance in the heart rate. RMSSD can help identify a general level of fatigue.
In addition, a higher RMSSD is linked to parasympathetic control, a sign that you are in the “rest and digest” mode. A lower RMSSD is linked to elevated sympathetic activity, an indication of a Stress Response.
RMSSD is one of the parameters used to calculate the PNS Index, along with Mean RRi and SD1.
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