A study of 17,000 U.S. adolescents finds that black and Hispanic girls are less physically active than white girls, but that this difference is attributable to the schools they attend: black, white and Hispanic girls attending the same school have no difference in physical activity.
In contrast, among boys, blacks and Hispanics were more physically active than whites attending the same schools.
The researchers, led by Tracy Richmond, MD, in the Division of Adolescent Medicine at Children's Hospital Boston, report and discuss their findings in the June issue of Pediatrics.
Richmond and colleagues carefully analyzed data from the National Longitudinal Study of Adolescent Health, a school-based study of 7th-to-12th graders.
"Obesity is a growing problem in all adolescents, but it affects racial and ethnic minorities disproportionately," Richmond says. "Since physical activity is one protective factor against obesity that we can influence, we wanted to know whether schools might help determine physical activity levels."
Their key findings are as follows: