The LF/HF ratio does not accurately measure cardiac sympatho-vagal balance

What this work gives Aellic

“Parasympathetic nerve activation contributes to at least 50 % of the LF variability while sympathetic activity, at best, only contributes 25 % to this variability.” That makes the LF/HF ratio unusable as a sympathovagal index — which is why Aellic deliberately does not use it.

Where this sits in the engine

1 declared site: constants and thresholds in the code that point at this entry.

• Recovery HRV baselines and deviations 1 site