00:00After 10 weeks of aerobic training, rats had roughly four times more neurons in the right-side
00:05cardiovascular nerve cluster than untrained animals. Scientists say exercise does not just
00:11strengthen the heart. It rewires it. Researchers at the University of Bristol found the change
00:17was strikingly lopsided. Neurons on the left side nearly doubled in size. Neurons on the
00:23right became slightly smaller. The team used advanced three-dimensional imaging, called
00:28stereology, to examine how exercise altered the nerve clusters that control heart function.
00:34Those clusters are the stellate ganglia. The discovery points to a previously hidden left-right
00:39pattern in the body's autopilot system that helps run the heart. These nerve clusters act
00:45like the heart's dimmer switch. And regular, moderate exercise remodels that switch in a
00:50side-specific way. The findings were published in the journal Autonomic Neuroscience. Under
00:56the title Asymmetric Neuroplasticity in Stellate Ganglia, side-specific adaptations to aerobic
01:03exercise. Understanding these left-right differences could help doctors personalize treatments for
01:09heart rhythm disorders and angina. Next, the team plans to investigate how these structural
01:15changes affect heart performance during exercise and at rest. They also want to test whether similar
01:22patterns appear in larger animals and in humans. Disclosure. This video contains stock footage
01:28and content created or enhanced using AI-assisted tools.
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