Regular exercise does more than make you fit. New studies show that steady, moderate activity changes the tiny nerves that tell the heart how to work. These changes could help doctors create better heart treatments.
Scientists at the University of Bristol teamed up with researchers in London and Brazil. For the first time they discovered that regular aerobic training reshapes heart‑controlling nerves in a different way on the left side of the body compared with the right side. The discovery was published in Autonomic Neuroscience and may lead to improved care for irregular beats, chest pain, angina, and stress‑related “broken‑heart” syndrome.
Exercise changes heart‑control nerves
The team used a 3‑D imaging method called stereology to look at nerve clusters that regulate the heart. After ten weeks of exercise, rats showed four times more nerve cells on the right side of the cardiovascular nerve cluster than on the left, compared with rats that didn’t train. At the same time, the left‑side nerve cells grew almost twice as large, while the right‑side cells became a little smaller. This shows that exercise remodels the heart’s nerve network in two opposite ways.
Why this matters for treatment
Dr. Coppi explained that many heart problems – such as arrhythmias, stress‑induced “broken‑heart” syndrome, and certain chest pains – are treated by calming over‑active stellate ganglia, tiny nerve hubs in the lower neck and upper chest. By understanding how exercise reshapes these ganglia on each side, doctors might one day target nerve‑blocking procedures to the side that will help the most.
Although the work was done in rats, the findings suggest future therapies could be tailored to one side of the nervous system, potentially improving outcomes for irregular heart rhythms and hard‑to‑treat angina.
What comes next
The researchers plan to study how these structural changes affect heart performance while exercising and at rest. They also want to see if the same left‑right pattern appears in other animal models and, eventually, in humans using non‑invasive measures.
Understanding the side‑specific wiring of the heart could lead to more personalized treatments for heart rhythm disorders and chest‑pain conditions.