While screen-based SB is common among young people, recent studies suggest that it is not a good proxy of the total sedentary time (ST) for a given day. 9 reported a small but significant reduction (Cohen d = −0.29) in screen time among 2- to 18-year-old across 14 randomized controlled trials. 8 did not find a significant decrease in screen time (−0.91 h week − 1 ) among participants under 18 years old across nine randomized controlled trials. 7 Meta-analyses of the effectiveness of interventions to reduce children’s and adolescents’ screen time have produced mixed results. 5 Intervention studies to reduce SB in children and adolescents have focused almost exclusively on screen-based media use, 6 because it is the most prevalent SB reported by young people. In recent years, the amount of time adolescents spend in sedentary activities has increased largely. 3 The health risks associated with a sedentary lifestyle were thought to be a result of insufficient PA, leading many to inaccurately assume that SB and PA were opposite ends of the same continuum. Over the last decade, SB has emerged as a distinctive behavioral paradigm associated with detrimental effects on chronic disease risk, independent of PA. 1 SB is defined as time engaged in activities, during the waking day, such as sitting or lying down while expending very little energy (approximately 1.0–1.5 metabolic equivalents). Sedentary behavior (SB) is conceptualized as being distinct from the absence of physical activity (PA). Whereas in cohort 2 the intervention prevented increases in ST, in cohort 3 the intervention reduced considerably the increase in ST noted in the control group. Conclusions : Sigue la Huella had mainly a protective effect in two of the three study cohorts. While in cohort 1 there were no significant differences in rate of linear change of ST between the experimental and the control group ( P = 0.148), in cohorts 2 and 3 significant differences were observed in favor of the experimental group ( β = −13.88, 95% CI = −25.00 to −2.76, P = 0.015 β = −76.73, 95% CI = −110.68 to −42.78, P < 0.001), independent of type of school (public vs.

Results : In the model with all participants, a significant interaction indicated that the effect of the intervention was dependent on the study cohort considered. Growth curve models were used to analyze the data. ST was measured for 7 days on four occasions using accelerometers. Sigue la Huella adopted a whole school approach and used both curricular and non-curricular intervention channels to empower students to make better decisions. Two schools were assigned to the experimental condition ( n = 368) and two schools to the control condition ( n = 314).

Methods : This quasi-experimental, cohort study took place in four secondary schools in Huesca (Spain) during the 2009–2010, 2010–20–2012 academic years (students aged 12–15 years). Background : To examine the effects of the Sigue la Huella (Follow the Footstep) intervention on adolescents’ daily sedentary time (ST).

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