Physical inactivity, TV-watching hours and body composition in children and adolescents.

Background: Physical inactivity is a predisposing factor to the onset/worsening of other cardiovascular risk factors, particularly obesity.

Objective: To determine physical activity level (PAL) and daily number of hours of TV (HTV) and the association and/or correlation of these variables with age, gender, economic class, public/private school, overweight and obesity in children and adolescents.

Methods: Cross sectional study, school-based population, public and private education, primary and secondary education.