The LF/HF ratio does not accurately measure cardiac sympatho-vagal balance
George E. Billman
Frontiers in Physiology · 2013
What the research tells us
Billman challenges the assumptions behind interpreting LF/HF as cardiac sympathetic–vagal balance. Both frequency components have mixed influences, and different physiological changes can produce similar ratios.
What to keep in mind
The critique concerns a specific interpretation of LF/HF. It does not make every HRV measure useless, nor does it validate a replacement stress or recovery score.
Study at a glance
- POPULATION & SAMPLE
- Methodological opinion drawing on physiological experiments and mathematical examples; no new trial sample.
- EXPOSURE / INTERVENTION / SUBJECT
- Assumptions connecting low- and high-frequency HRV components with autonomic activity.
- OUTCOMES
- Validity of LF/HF interpretation, including non-linear autonomic interactions and respiratory influences.
- TIME FRAME
- Methodological discussion published in 2013; examples span several experimental contexts.
Cited on this site
Editorial & review record
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Scope of this reading note
Based on the publication’s text, including Main text: assumptions, physiological examples and ratio interpretation. This reading note has not undergone independent scientific review.
- STUDY FUNDING
- Not yet checked against the full publication.
- STUDY CONFLICTS OF INTEREST
- Not yet checked against the full publication.
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Founded and supported by Resilio.
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