Having a hard time figuring out the implications of this. We know HRV is "good" as a general matter, as orderliness of heart-rate variation is predictive of mo

Having a hard time figuring out the implications of this. We know HRV is "good" as a general matter, as orderliness of heart-rate variation is predictive of mortality post-infarction [sorry no cite; read some papers in the 90's w/ convincing plots of instantaneous heart rate vs ihr 10 beats ago]. The linked research shows an increase in power of the middle part of the spectrum (fft of intrabeat heart rate), which is usually linked to respiratory sinus arrhythmia (RSA, or the change in chest cavity pressure while breathing changes your heart rate). Anyway, it's interesting, but maybe the value is in the pathway discussion rather than any specific end-effects on health. Would love to hear from people closer to this topic , or OP's specific interest in the matter.