What is RMSSD?
RMSSD (root mean square of successive differences) is the primary HRV metric reflecting short-term autonomic nervous system activity. It is the most widely used HRV measure in wearable fitness devices, sports science, and cardiac health monitoring.
What is normalized HRV score (x10)?
Normalized HRV score (×10) is a scaled HRV metric that maps raw HRV values onto a standardized reference range, multiplied by 10 for resolution. It is used by consumer health platforms to present HRV data in a user-friendly numerical format.