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International audience; AbstractSedentary behaviour (SB) has emerged as a potential risk factor for metabolic health in youth. Knowledge on the determinants of SB in youth is necessary to inform future intervention development to reduce SB. A systematic review was conducted to identify predictors and determinants of SB in youth. Pubmed, Embase, CINAHL, PsycINFO and Web of Science were searched, limiting to articles in English, published between January 2000 and May 2014. The search strategy was based on four key elements and their synonyms: (a) sedentary behaviour, (b) determinants, (c) types of sedentary behaviours, (d) types of determinants. The full protocol is available from PROSPERO (PROSPERO 2014:CRD42014009823). Cross-sectional studies were excluded. The analysis was guided by the socio-ecological model. 37 studies were selected out of 2654 identified papers from the systematic literature search. Most studies were conducted in Europe (n = 13), USA (n = 11), and Australia (n = 10). The study quality, using the Qualsyst tool, was high with a median of 82 % (IQR: 74–91 %). Multiple potential determinants were studied in only one or two studies. Determinants were found at the individual, interpersonal, environmental and policy level but few studies examined a comprehensive set of factors at different levels of influences. Evidence was found for age being positively associated with total SB, and weight status and baseline assessment of screen time being positively associated with screen time (at follow-up). A higher playground density and a higher availability of play and sports equipment at school were consistently related to an increased total SB, although these consistent findings come from single studies. Evidence was also reported for the presence of safe places to cross roads and lengthening morning and lunch breaks being associated with less total SB. Future interventions to decrease SB levels should especially target children with overweight or obesity and should start at a young age. However, since the relationship of many determinants with SB remains inconsistent, there is still a need for more longitudinal research on determinants of SB in youth.

Televizyon bizi eğlendirir, bilgilendirir, dünya ve çevremizle bağlantı halinde olmamıza yardımcı olur. Ancak, aşırı ticarileşme, şiddet ve seksin eğlence olarak paketlenmesi, haberlerdeki önyargılar, cinsiyet ayrımcılığı ve diğer kurgulanmış mesajlar hem yetişkinlerin hem de çocukların medya okur yazarlığına niçin gereksinim duyduğunu açıklar ve nedenlerini ortaya koyar. Bu makale, ABD, AB ve Türkiye’den örneklerle, çocukların televizyonun zararlı etkilerinden nasıl korunması gerektiğini keşfetmek amacıyla pedagojik ve teknolojik yöntemlerin seferber edileceği yolları ve araçları ve medya okuryazarlığının ne anlama geldiğini açıklamaya çalışmaktadır. Television entertains, informs and helps us stay connected to our commununity and the World. But haper-commercialization, violence and sex packeged as entertaintment, news bias gender discrimination and other manipulated messages explain and provide many reasons why both children and adults need media literacy. This paper is dealing with explaining the ways and means through which how pedagogical and technologial methods are deployed in order to discover how children should be protected from television’s harmful effects and what media literacy means with examples from the USA, the EU and Turkey.