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May 29

Peer Pressure and Exercise: Could it Make Kids Healthier?

A new study found that the single biggest influence on kids' physical activity levels was the exercise habits of their six closest friends.

Martin Barraud / Getty Images

Peer pressure can be a powerful force, and sometimes a positive one. For example, hanging out with active peers may lead kids to exercise more, making a childs social network a potential vehicle for promoting healthy habits and reducing obesity.

Thats what researchers led by Sabina Gesell, a research assistant professor in pediatrics at Vanderbilt School of Medicine, and her colleagues are reporting in the journal Pediatrics. The scientists studied networks of friends in an after-school program involving students aged 5 to 12. Using a pedometer-like device that recorded minute muscle movements, the researchers tracked kids physical activity levels over a period of 12 weeks.

At the start of the program, none of the children knew one another well, so the researchers were able to track how the youngsters made and dropped friends, and what effect these changing relationships had on their physical activity level.

(MORE: Why Active Video Games Dont Make Kids Exercise More )

Turned out, it was a big one: during the time the children spent in the program, the strongest factor influencing how much time they spent engaged in moderate to vigorous physical activity was the activity level of their four to six closest friends. In fact, children changed their exercise level about 10% to better match those in their circle; children who hung out with more active students were more likely to increase their physical activity levels, while those who befriended more sedentary children became less active.

We see evidence that the children are mirroring, emulating or adjusting to be similar to their friends, says Gesell. And thats exciting because we saw meaningful changes in activity levels in 12 weeks.

The results are encouraging also because they suggest a potentially inexpensive and effective way to change childrens behavior. Rather than relying only on organized exercise programs or drowning kids in messages to get moving, perhaps a subtler approach introducing sedentary kids to more active ones might help more kids get off the couch. From a public health perspective, that would mean seeding groups like after-school programs or community groups with children who like to exercise, so that by emulating them, others may become more active by association.

Even kids in day care can stand to benefit: a recent study found that children in day care are active only about 2% to 3% of the time they are there. Gesell says the results could help in providing a much-needed new tool for confronting the obesity epidemic.

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Peer Pressure and Exercise: Could it Make Kids Healthier?

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