...all three of the studies that measured time spent in physical activity found it associated with academic performance, and the two rated highest in methodological quality confirmed a positive relationship between physical activity and school achievement.
The reasons for the connection are unknown, but the researchers suggest that exercise increases the flow of blood and oxygen to the brain and may lead to increased levels of norepinephrine and endorphins, important in stress reduction.
The lead author, Amika S. Singh, a senior researcher at VU University Medical Center in the Netherlands, said there was no evidence about exactly how much or what kind of exercise is beneficial. But, she added, "I think it's healthy to look for a good balance between time spent in academic work and in physical activity."
Image: Girl playing in the snow, via Shutterstock.