The researchers used magnetic resonance imaging scans to help document the process in mice -- and then used MRIs to look at the brains of people before and after exercise.

• 研究人员们使用了核磁共振成像扫描以帮助记录小鼠身上变化过程---然后用核磁共振成像扫描来观察锻炼前后的人脑情况。