Researchers at the University of Bristol have uncovered that aerobic activity alters the nerve clusters responsible for heart function, exhibiting an uneven effect. Following a 10-week regimen of aerobic exercise, rats displayed approximately four times as many neurons in the right-side cardiovascular nerve cluster compared to their untrained counterparts, while the neurons on the left side nearly doubled in volume. This finding reveals a previously unrecognized left-right dynamic within the body's autonomic system that regulates cardiac function. The researchers liken these clusters to a dimmer switch for the heart, suggesting that these insights could lead to more tailored treatments for heart rhythm issues and angina.
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