The aims of the present study were: (i) describe patterns of sedentary behavior in Spanish adolescents; and (ii)
IntroductionIn today's postmodern society, most people spend the majority of their waking hours engaging in sedentary behavior 1 . Emerging evidence shows that prolonged sedentary behavior may have a deleterious effect on health 2 . For example, excessive sedentary behavior has been associated with premature all-cause and cardiovascular disease mortality, obesity and an unfavorable cardiometabolic risk factor profile in adults 2 . Regarding this behavior in youth, although evidence is more limited, excessive sedentary behavior appears to have a harmful effect on health 3,4 . Consequently, educational and public health organizations have focused efforts on promoting a decrease in sedentary behavior from an early age 5 .Sedentary behavior includes activities that involve low levels of energy expenditure, consisting mainly of sitting time in different contexts 2 . Since several sedentary activities are part of young people's daily routine (e.g.: classes at school, studying), sedentary activities during leisure time are the target of preventive strategies 4 . Among youth, the most common leisure-time sedentary behavior is watching television (TV). Furthermore, new media technologies such as computers and games consoles have provided new opportunities for sedentary activity among this age group and while parents tend to limit the use of different kinds of media during child-ARTIGO ARTICLE