Children who sit too much may face adult-sized health consequences, according to a sobering new study of healthy young girls. The study found that after a single session of prolonged inactivity, the children developed changes in their blood flow and arteries that, in grown-ups, would signal the start of serious cardiovascular problems.
There is plenty of evidence, of course, that uninterrupted sitting dents the health of adults. For the new study , Ali McManus, an asso ciate professor of pediatric exercise physiology at the University of British Columbia in Kelowna, and her colleagues decided to ask children to sit still.
In general, today's children are doing plenty of that. One recent large-scale epidemiological study reported that children across the globe sit for about 8.5 hours every day . Another recent study found that activity levels among children drop precipitously after about age 8 and continue to fall through adolescence, with young people trading movement for sitting.