HRV — Myths and Overmarketed Claims
TL;DR
HRV is widely misrepresented in consumer wellness content. Many popular claims about HRV are either mechanistically unfounded, oversimplified, or actively misleading. This note collects the most common ones.
Known Myths
Myth 3: LF/HF as Autonomic Balance Score
Claim: “High LF/HF ratio means sympathetic dominance; low means parasympathetic dominance.”
Reality: LF (low-frequency) power contains contributions from both sympathetic and parasympathetic nervous system activity. Mayer Waves — slow arterial pressure oscillations at ~0.1 Hz — are a major LF component that has nothing to do with cardiac autonomic balance. Using LF/HF as a “sympathovagal balance” metric is rejected by most contemporary HRV researchers.
Key reference: Berntson GG, et al. Heart rate variability. Psychophysiology. 1997.
Myth 6: Post-Breathwork HRV as Vagal Activation Proof
Claim: “Doing box breathing or holotropic breathing raises HRV, proving vagal activation.”
Reality: Many breathwork practices cause large HR oscillations that look like “high HRV” on short-term measurements. These respiratory sinus arrhythmias (RSA) are a mechanical HR pattern, not a training effect on autonomic tone. Measured over minutes post-breathwork, HRV often returns to baseline. Long-term vagal training effects are real but much smaller and slower than breathwork demos suggest.
Relevant: See Respiratory Sinus Arrhythmia — RSA is a confound on HRV interpretation, not proof of vagal adaptation.
Why These Matter for Vitals
The Vitals pipeline interprets HRV signals for recovery and readiness coaching. If users arrive with inflated expectations from popular HRV myths, coaching precision suffers. Accurate HRV framing improves trust and protocol adherence.
Related
- HRV — primary HRV note
- Respiratory Sinus Arrhythmia — RSA as HRV confound
- Mayer Waves — LF component source