00:00Exercise made heart-controlling nerve cells grow on one side, but shrink on the other.
00:04A new study suggests that physical activity may reshape more than the heart muscle itself.
00:10Researchers examined rats after 10 weeks of moderate aerobic exercise,
00:14studying nerve clusters that help regulate heartbeat.
00:18The results revealed a striking left-right difference.
00:21In trained rats, nerve cells on the left nearly doubled in size,
00:24while cells on the right became slightly smaller.
00:27The researchers also reported roughly four times as many neurons in the right-side cluster as in the left.
00:33These nerve clusters help send signals that influence how the heart works.
00:38Understanding their differences could eventually help researchers develop more precise treatments
00:43for certain heart rhythm problems and chest pain.
00:45But there is an important limitation.
00:48The experiment involved rats, not people.
00:51Scientists still need to establish how these structural changes affect heart function,
00:56and whether similar patterns occur in humans.
00:59Disclosure.
00:59This video contains stock footage and content created or enhanced using AI-assisted tools.
