Physical exercise changes the structure of the nerves that control the heart

• Physical exercise changes the structure of the nerves that control the heart
• The changes differ between the left and right sides of the body
• This may help in the treatment of cardiovascular diseases

Physical exercise and its impact on the heart's nervous system

Recent studies conducted by scientists from the University of Bristol have shown that physical exercise not only strengthens the heart but also alters the structure of nerve cells that control its function. These changes, researchers found, differ between the left and right sides of the body. In particular, moderate aerobic exercise leads to noticeable changes in the nerve cells involved in regulating heart activity, opening new horizons for understanding the impact of physical activity on the nervous system.

In a study published in the journal Autonomic Neuroscience, scientists examined the effects of a 10-week moderate aerobic training program on rats. Aerobic exercises, such as brisk walking, swimming, or cycling, increase heart rate and breathing. Using modern three-dimensional analysis methods, researchers discovered that the nerve clusters responsible for heart activity change differently on both sides of the body, which had not been observed before.

The results showed that the right nerve cluster in trained rats contains four times more neurons than the left. This finding suggests that physical activity does not affect all nerve cells equally, but produces specific structural changes that may provide clues about how the nervous system adapts to regular physical activity.

Study of changes in nerve cells

Changes in nerve cells also relate to their size: neurons on the left side increased in size by almost twice, while on the right side they slightly decreased. These differences may have significant implications for treating conditions related to abnormal nerve activity around the heart, such as arrhythmia and angina.

Arrhythmia is a condition where the heart beats too fast, too slow, or irregularly. Angina, in turn, causes chest pain, usually due to insufficient blood supply to the heart muscle. Understanding the differences between the left and right nerve clusters may help doctors determine which side should be targeted for maximum benefit in treating these conditions.

Dr. Augusto Coppi, the lead author of the study, noted that understanding these differences could help personalize treatment for patients with arrhythmias and angina. For example, procedures such as stellate ganglion block may be more effective if targeted to the correct side, depending on individual changes caused by physical activity.

Practical implications for medicine

Despite significant structural changes, researchers emphasize the need to establish how exactly they affect heart function. The research team plans to study how differences between left and right nerve clusters influence heart behavior at rest and during physical activity.

In the future, researchers intend to look for similar patterns in other animals and ultimately in humans. For human studies, non-invasive markers are planned to be used, which can provide information about nerve activity without the need for surgical intervention or tissue removal.

If similar differences between the left and right sides are found in humans, this discovery could aid in the development of more personalized treatment methods for arrhythmias, hard-to-treat angina, and stress-induced 'broken heart' syndrome.

Future research directions

Dr. Coppi added that understanding these differences could significantly improve approaches to treating cardiovascular diseases. The next step is to examine how structural changes relate to heart function and whether similar patterns exist in humans.

Thus, the study's results open new horizons for understanding the connection between physical activity and the nervous system that controls the heart. This could lead to more effective treatment methods and improved quality of life for patients with cardiovascular diseases.

In conclusion, although the study is in its early stages and was conducted on rats, it highlights the importance of further research in this area. Understanding how physical exercise affects nerve cells could lead to significant breakthroughs in cardiology and neurology.

Source: ScienceDaily