- Title
- Intervention to reduce recreational screen-time in adolescents: outcomes and mediators from the 'Switch-Off 4 Healthy Minds' (S4HM) cluster randomized controlled trial
- Creator
- Babic, Mark J.; Smith, Jordan J.; Morgan, Philip J.; Lonsdale, Chris; Plotnikoff, Ronald C.; Eather, Narelle; Skinner, Geoff; Baker, Amanda L.; Pollock, Emma; Lubans, David R.
- Relation
- ARC.FT140100399, NHMRC.1100138 & NHMRC.1200044 http://purl.org/au-research/grants/arc/FT140100399
- Relation
- Preventive Medicine Vol. 91, p. 50-57
- Publisher Link
- http://dx.doi.org/10.1016/j.ypmed.2016.07.014
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2016
- Description
- Introduction: The primary objective was to evaluate the impact of the ‘Switch-off 4 Healthy Minds’ (S4HM) intervention on recreational screen-time in adolescents. Methods: Cluster randomized controlled trial with study measures at baseline and 6-months (post-intervention). Eligible participants reported exceeding recreational screen-time recommendations (i.e., > 2 h/day). In total, 322 adolescents (mean age = 14.4 ± 0.6 years) from eight secondary schools in New South Wales, Australia were recruited. The S4HM intervention was guided by Self-Determination Theory and included: an interactive seminar, eHealth messaging, a behavioral contract and parental newsletters. The primary outcome was recreational screen-time. Secondary outcomes included mental health (i.e., well-being, psychological distress, self-perceptions), objectively measured physical activity, and body mass index (BMI). Outcome analyses were conducted using linear mixed models and mediation was examined using a product-of-coefficients test. Results: At post-intervention, significant reductions in screen-time were observed in both groups, with a greater reduction observed in the intervention group (− 50 min/day versus − 29 min, p < 0.05 for both). However, the adjusted difference in change between groups was not statistically significant (mean = − 21.3 min/day, p = 0.255). There were no significant intervention effects for mental health outcomes, physical activity or BMI. Significant mediation effects for autonomous motivation were found. Conclusions: Participants in both the S4HM intervention and control groups significantly reduced their screen-time, with no group-by-time effects. Enhancing autonomous motivation might be a useful intervention target for trials aimed at reducing adolescents' recreational screen-time.
- Subject
- screen; sedentary behavior; school; physical activity
- Identifier
- http://hdl.handle.net/1959.13/1333410
- Identifier
- uon:27083
- Identifier
- ISSN:0091-7435
- Language
- eng
- Full Text
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