TAP reading note: The LF/HF ratio does not accurately measure cardiac sympatho-vagal balance
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.
Updated 2026-10-27 · Archived
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What the study found
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.
Scope & limitations
Methodological opinion drawing on physiological experiments and mathematical examples; no new trial sample.
The paper examines assumptions behind interpreting LF/HF as sympathovagal balance. Its critique concerns that specific interpretation; other HRV metrics require evaluation of their own physiological basis and measurement conditions.
Population & sample
Methodological opinion drawing on physiological experiments and mathematical examples; no new trial sample.
Exposure or intervention
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.
Research funding
Not yet checked against the full publication.
Research conflicts of interest
Not yet checked against the full publication.
Reading scope
Based on the publication’s text, including Main text: assumptions, physiological examples and ratio interpretation.
References
Publication record
TAP-RDN-0018 · v0.2 · English
The Allostasis Project is founded and supported by Resilio.
Record for v0.2 · Updated
Editorial responsibility: TAP Editorial Team
Editorial note
Under the editorial responsibility of the TAP Editorial Team, this publication used AI assistance for content organization and editing.
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