Exercise has long been recommended as one of the best ways to keep the heart healthy.
It strengthens the heart muscle, improves blood circulation, and lowers the risk of many diseases. A new study suggests it may also reshape the nerves that control the heart in ways scientists never realized before.
The research was carried out by the University of Bristol together with researchers from University College London and two universities in Brazil. The findings were published in Autonomic Neuroscience.
The heart is controlled by an automatic network of nerves known as the autonomic nervous system.
These nerves constantly adjust heart rate and blood flow as the body’s needs change. Problems in this system can contribute to abnormal heart rhythms, chest pain, and other cardiovascular conditions.
The scientists examined tiny nerve hubs called stellate ganglia, which send important signals from the nervous system to the heart. Doctors sometimes reduce the activity of these nerves to treat serious heart rhythm problems when medicines do not work well.
Using advanced imaging methods, the researchers compared rats that completed 10 weeks of moderate aerobic exercise with rats that did not exercise. They found clear structural differences between the two groups.
In the exercising animals, the right-sided nerve cluster contained about four times more nerve cells than before, while nerve cells on the left side became much larger. These changes suggest that exercise reorganizes the heart’s nerve control system instead of simply making the heart stronger.
This discovery may eventually help doctors design more accurate treatments. Instead of treating both sides of the nervous system in the same way, future therapies might target the left or right side depending on the patient’s condition.
The findings could be especially relevant for people with arrhythmias, angina, and stress-induced broken-heart syndrome. These conditions are sometimes linked to excessive nerve activity, and more precise treatments could improve outcomes while reducing unwanted side effects.
Even though the results are exciting, the research is still at an early stage. The study was performed only in rats, and scientists do not yet know whether the same changes happen in humans. Clinical studies will be needed before any new treatments are developed.
The research team plans to continue studying how these nerve changes influence heart function during exercise and rest. They will also investigate whether the same left-right pattern exists in humans using non-invasive methods.
Review and analysis: The study opens an interesting new field by linking exercise with structural changes in the nervous system rather than only changes in the heart muscle itself. The results may help explain why exercise provides broad cardiovascular benefits. However, much more work is required before these discoveries can be translated into everyday patient care.
If you care about heart disease, please read studies that herbal supplements could harm your heart rhythm, and how eating eggs can help reduce heart disease risk.
For more health information, please see recent studies that apple juice could benefit your heart health, and results showing yogurt may help lower the death risks in heart disease.
Source: University of Bristol.
