Exercise Rewires Heart Nerves in Side-Specific Pattern
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- University of Bristol researchers found that 10 weeks of aerobic exercise in rats produced about 4x more neurons in the right-side cardiac nerve cluster compared to the left, relative to untrained animals
- Dr. Augusto Coppi, Senior Lecturer in Veterinary Anatomy at Bristol and study lead, compared the stellate ganglia to a 'dimmer switch' that exercise remodels in a side-specific way
- Left-side neurons in the cardiovascular nerve cluster nearly doubled in size after training, while right-side neurons became slightly smaller
- The study, published in Autonomic Neuroscience, was conducted in collaboration with University College London, the University of São Paulo, and the Federal University of São Paulo
- Researchers used stereology, an advanced 3D imaging technique, to examine paired stellate ganglia — the nerve hubs in the lower neck/upper chest that send 'go faster' signals to the heart
- Researchers framed the findings as a basis for more targeted nerve blocks or denervation procedures for arrhythmias, angina, and stress-induced 'broken-heart' syndrome, while emphasizing the work remains early-stage and in rats
- The team plans next to test how the structural changes affect heart performance during exercise and at rest, and whether the same left-right pattern appears in larger animals and humans using non-invasive markers
Why it matters: Current denervation procedures for arrhythmias, angina, and broken-heart syndrome target the stellate ganglia without side-specific guidance. The Bristol study maps a 4x right-side neuron increase and doubled left-side neuron size after 10 weeks of aerobic training — the first structural detail pointing toward left- or right-targeted nerve blocks in future clinical use.
