Astrocyte contraction may explain how exercise spurs neuron growth

A study in mice suggests that physical activity causes star-shaped brain cells called astrocytes to contract, which may promote the formation of new neurons in the hippocampus. Researchers observed contraction markers within minutes of running and found that substances released by contracting muscle cells could induce astrocyte contraction in the lab. This mechanism could help clarify how exercise supports brain health and protects against cognitive decline.