Exercise is widely known for building stronger muscles, but new research suggests it also reshapes the brain in ways that improve endurance. A study published in the Cell Press journal Neuron found that repeated exercise changes brain activity linked to the body's ability to run farther and faster over time. These changes appear to help the heart and muscles adapt and become stronger with training.
"A lot of people say they feel sharper and their minds are clearer after exercise," says corresponding author J. Nicholas Betley of the University of Pennsylvania. "So we wanted to understand what happens in the brain after exercise and how those changes influence the effects of exercise."
Brain Activity Continues After Exercise
During experiments, Betley and his team observed increased brain activity in mice after treadmill running. The strongest changes appeared in nerve cells within a region called the ventromedial hypothalamus (VMH), which helps regulate how the body manages energy, body weight, and blood sugar.
The researchers tracked activity in a specific set of VMH nerve cells known as steroidogenic factor-1 (SF1) neurons. These neurons became active while the mice were running and continued firing for at least an hour after exercise ended.
