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BRS6-FM3-PM7 — Vagal Tone / HRV Regulation​

Stage 2B draft — not approved. Independent Stage 2A/2B preview. Canonical science, mappings, ratings and review status are unchanged.

1. Mission & Overview​

Mission​

Sustain vagal tone so heart-rate-variability-linked recovery signalling remains robust under repeated stress exposure.

Intervention Dominance: Lifestyle-Dominant — System Optimisation Practices

Inherited qualification requires final scientific approval. Biological requirements alone do not establish responsiveness or comparative dominance. No head-to-head comparative supremacy is established. Other admitted routes remain in section 3; absence of an admission is not inferiority.

Overview​

The vagus nerve helps regulate the heart’s response to demand. Heart-rate variability, the changing interval between beats, provides one window onto cardiac regulation when breathing and measurement conditions are considered. Paced breathing can change this signal during a session. An omega-3 trial also found changes in adults with elevated triglycerides. These findings make cardiac regulation addressable, while requiring a clear distinction between measured HRV and the wider functions of the vagus. Sauder et al. (2013) [1]; You et al. (2021) [5]

  • Benefits: Responsive cardiac regulation contributes to recovery physiology, with HRV used as a context-dependent measure. You et al. (2021) [5]
  • Implementation Notes: Slow-paced breathing at six cycles per minute was studied for five to twenty minutes; longer was not consistently better. Sauder et al. (2013) [1]; You et al. (2021) [5]
  • Biological Relevance: Higher session HRV does not establish stronger whole-body vagal function or lasting recovery.

2. Primary Biological Effects​

  • Slow-paced breathing increased RMSSD during the session relative to control. You et al. (2021) [5]
  • The higher-dose EPA+DHA condition increased RMSSD and total power relative to placebo. Sauder et al. (2013) [1]

3. Intervention Levers​

4. Mechanistic Basis​

Summary​

Slow-paced breathing increased RMSSD during the session relative to control. You et al. (2021) [5]

Biological process​

The cardiac proxy was responsive; post-session persistence and general vagal function remain different questions. You et al. (2021) [5]

Mechanism Boundary​

Higher session HRV does not establish stronger whole-body vagal function or lasting recovery. The draft preserves each source’s measured endpoint; the Mission describes the biological job and does not assert that every tested lever achieved the entire Mission.

Integration​

This PM contributes its specified process to BRS6(FM3). Shared fuels, nutrient lists and correlated markers do not merge distinct biological jobs or establish the integrated outcome.

4.1 Scientific Findings​

Summary​

Slow breathing produced a during-session HRV effect without a duration gradient or established persistent change. EPA+DHA altered HRV in a specific metabolic population. The student anxiety/inflammation trial did not measure vagal tone. Sauder et al. (2013) [1]; You et al. (2021) [5]

5. BRS Pathways and Connections​

5.1 BRS Pathways​

No newly adjudicated BRS pathway is added by this preview.

5.2 Cross-BRS Mechanism Relationships​

No downstream mapping is inherited from a shared nutrient or KC candidate.

5.3 Local BRS Mechanism Relationships​

PM6 addresses recovery after activation; a respiration-sensitive HRV rise does not prove recovery of all autonomic branches.

7. Phenome Connections​

No new phenome rating is admitted by this unapproved preview. Inherited candidates are retained in the structured assessment history; biomarker or neural changes do not automatically demonstrate a cognitive outcome.

8. References​