Could just be dehydration: >> [they] used water trapped between layers of myelin as a proxy for myelin content. More of this water indicates more myelin. But y

Could just be dehydration: >> [they] used water trapped between layers of myelin as a proxy for myelin content. More of this water indicates more myelin. But you can’t rule out the effects of dehydration, Bouhrara says. If runners are dehydrated after their race, their brain tissues may just be dried out.