Vagal Tone & HRV Regulation — References

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Parent Topic: Vagal Tone & HRV Regulation | References Hub: 01 - Foundations References MOC

Primary Literature & Landmark Studies

Citation: Shaffer, F., & Ginsberg, J. P. (2017). An overview of heart rate variability metrics and norms. Frontiers in Public Health, 5, 258.
Identifiers: DOI: 10.3389/fpubh.2017.00258 (DOI · SciDB · Scholar) | PMID: 29034226 (PubMed · Europe PMC)
Study Design: Comprehensive physiological and methodological synthesis of 24-hour, short-term (5-minute), and ultra-short-term (10–60 second) heart rate variability metrics and normative reference values.
Key Quantitative Outcomes:
- Confirmed that RMSSD (Root Mean Square of Successive Differences) and HF power ( $0.15-0.40 Hz$ ) reflect beat-to-beat vagal (parasympathetic) modulation mediated by sinoatrial $M_{2}$ muscarinic receptors, whereas the LF/HF ratio does not accurately measure “sympathovagal balance” because the LF band ( $0.04-0.15 Hz$ ) is heavily dominated by baroreflex-mediated vagal outflow during resting and slow-breathing states.

Citation: Tracey, K. J. (2002). The inflammatory reflex. Nature, 420(6917), 853–859.
Identifiers: DOI: 10.1038/nature01321 (DOI · SciDB · Scholar) | PMID: 12490958 (PubMed · Europe PMC) | Companion Receptor Discovery: Wang et al. (2003), Nature, 421(6921), 384–388, DOI: 10.1038/nature01339 (DOI · SciDB · Scholar) (PMID: 12508119 (PubMed · Europe PMC))
Study Design: Landmark neuroimmunology synthesis and experimental receptor-knockout validation of the vagal cholinergic anti-inflammatory pathway.
Key Quantitative Outcomes:
- Demonstrated that electrical or pharmacological activation of efferent vagus nerve signaling releases acetylcholine onto $α 7$ nicotinic acetylcholine receptors ( $α 7 nAChR$ ) on macrophages, inhibiting lipopolysaccharide-induced TNF- $α$ release by >75% ( $p < 0.001$ ) as well as IL-1 $β$ , IL-6, and IL-18 without suppressing anti-inflammatory IL-10.

Citation: Thayer, J. F., & Lane, R. D. (2009). Claude Bernard and the heart–brain connection: Further elaborations of a model of neurovisceral integration. Neuroscience & Biobehavioral Reviews, 33(2), 81–88.
Identifiers: DOI: 10.1016/j.neubiorev.2008.08.004 (DOI · SciDB · Scholar) | PMID: 18771686 (PubMed · Europe PMC)
Study Design: Neuroimaging, pharmacological blockade, and psychophysiological synthesis of the Central Autonomic Network (CAN).
Key Quantitative Outcomes:
- Established that resting vagally mediated HRV (RMSSD/HF-HRV) correlates directly ( $r = 0.40-0.65$ ) with prefrontal cortical thickness, regional cerebral blood flow in the ventromedial prefrontal cortex (vmPFC), and working memory / executive inhibitory control over subcortical amygdala threat circuits.

Citation: Pietilä, J., Helander, E., Korhonen, I., Myllymäki, T., Kujala, U. M., & Lindholm, H. (2018). Acute effect of alcohol intake on cardiovascular autonomic regulation during the first hours of sleep in a large real-world sample of Finnish employees: Observational study. JMIR Mental Health, 5(1), e23.
Identifiers: DOI: 10.2196/mental.9519 (DOI · SciDB · Scholar) | PMID: 29549064 (PubMed · Europe PMC)
Study Design: Large-scale observational within-subject study in free-living adults ( $N = 4, 098$ subjects recording $\geq 1$ night with alcohol and $\geq 1$ night without alcohol using beat-to-beat Firstbeat ECG sensors).
Key Quantitative Outcomes:
- During the first 3 hours of sleep, alcohol suppressed nocturnal RMSSD in a strict dose-dependent manner:
  - Low dose ( $\leq 0.25 g/kg$ , ~1–2 drinks): RMSSD decreased by $- 9.3%$ ( $- 3.1 ms, p < 0.001$ ); HR increased by $+ 1.4 bpm$ .
  - Moderate dose ( $0.25-0.75 g/kg$ , ~2–4 drinks): RMSSD decreased by $- 24.0%$ ( $- 8.0 ms, p < 0.001$ ); HR increased by $+ 4.0 bpm$ .
  - High dose ( $> 0.75 g/kg$ ): RMSSD decreased by $- 39.2%$ ( $- 13.0 ms, p < 0.001$ ); HR increased by $+ 8.7 bpm$ .