Question:
How does mechanical strain on the right ventricular wall during rowing at low heart rates (60–70 bpm) affect the Aveir VR’s pacing threshold or local myocardial excitability, potentially leading to transient discomfort sensations?
Part 1 — Mechanisms
Core mechanisms: mechano‑electric feedback, contact geometry & micro‑motion, stroke‑volume dominated regime, autonomic balance, and resonance bands.
- MEF: Stretch‑activated channels modulate excitability and capture threshold near the fixation site.
- Contact geometry: Preload‑driven deformation may alter current density and stimulate mechanosensitive afferents.
- Autonomics: Early parasympathetic predominance can heighten interoception; sympathetic rise blunts perception.
- Resonance: 1–1.2 Hz oscillations may couple to micro‑oscillation modes.