Exercise doesn't just strengthen muscles—it also helps the brain by making nerves grow faster and heal better, according to recent research from MIT. When muscles contract, they release specific molecules and physical forces that encourage neurons (the cells that allow the brain and body to communicate) to grow up to four times farther than they would without exercise.
Scientists at MIT found that exercising muscles release biochemical messengers called myokines, which travel to neurons and signal them to grow. These molecules act like a "growth boost" for nerves, helping them repair and form new connections—good news for anyone hoping to recover from injuries or slow down the effects of neurological diseases.
Surprisingly, the benefits aren't just biochemical. When the researchers mimicked the stretching and squeezing that happens in real muscles during exercise, they found that neurons thrived just as much from these physical movements as from the chemical messengers. This suggests that both moving muscles and the messengers they release work together to support nerve health and regrowth.
Why Is This Important?
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Just 30 minutes of exercise can boost neuron growth by as much as 400%.
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The findings could lead to new therapies that help people recover from nerve injuries or diseases like ALS and multiple sclerosis—by encouraging nerve growth through exercise or related treatments.
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Scientists now think that physical activity should be part of rehabilitation for nervous system injuries, since it gives nerves the best chance to recover.
Moving muscles are not just "receivers" of brain signals, but they also "talk back," sending powerful signals that help the nervous system heal and adapt. As one of the MIT study leaders, Dr. Ritu Raman, explained, "Now that we know this muscle-nerve crosstalk exists, it can be useful for treating things like nerve injury, where communication between nerve and muscle is cut off. If we stimulate the muscle, we could encourage the nerve to heal and restore mobility to those who have lost it due to traumatic injury or neurodegenerative diseases."
Exercise is more powerful than many people realize. The MIT research shows that even moderate physical activity benefits the body in ways that extend beyond the muscles alone, opening doors to new kinds of therapies and offering hope for many individuals living with nerve-related conditions. So every time muscles are moving, they're not just getting stronger—they're helping the brain and nerves heal too.
Sources:
https://advanced.onlinelibrary.wiley.com/doi/10.1002/adhm.202403712
https://psychiatryonline.org/doi/full/10.1176/appi.neuropsych.20240173
https://brinksreport.com/30-minutes-of-exercise-daily-could-quadruple-brain-cell-growth-mit-find
https://www.webmd.com/multiple-sclerosis/ms-or-als
https://www.verywellmind.com/what-are-neurodegenerative-diseases-5524683
