Originally Posted by
Seattle Forrest
Is this RMSSD or something else?
Like if somebody told you they got a power meter, said 150, and then asked you for advice. You would want to know if 150 is their FTP, the average power from their last ride, a number they saw for a second while riding, the number of kJ they burned, or what? That's what I'm asking about your HRV.
It's like watts. You know that's power. RMSSD is measured in ms. RMSSD is a standard HRV measurement, only one of several possible measurements, but the most used because it best reflects parasympathetic activity, the thing that's most important to the athlete as a measure of recovery. Almost all HRV gadgets and software show RMSSD. One could also watch SDNN, also measured in ms, if your device supported that.