Age-related change and context of sedentary and screen behaviour in young people

Kontostoli, Elli (2022) Age-related change and context of sedentary and screen behaviour in young people. Doctoral thesis, University of East Anglia.

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Evidence shows that sedentary and screen behaviour may be associated with physical and mental health. Further evidence suggests that time spent in sedentary and screen behaviours increases from childhood to adolescence. Health behaviours in childhood and adolescence may persist into adulthood; therefore, there is a need to further our understanding of the factors that influence sedentary and screen behaviour and the social contexts in which the behaviours occur. This information is required to support planning for effective interventions to reduce excessive screen time and associated adverse health outcomes. This thesis presents four linked studies that examine age-related change and context of sedentary and screen behaviours, and associations with health behaviours. Chapter 2 is a systematic review and meta-analysis which describes age-related changes in sedentary and screen behaviour during childhood and adolescence and examines whether the magnitude of change varies across social or demographic population groups. Using data from the Study of Cognition, Adolescents and Mobile Phones cohort, Chapter 3 describes changes in time spent in contemporary screen-based behaviours and examines sociodemographic differences in these changes over approximately 2 years in adolescents aged 11 – 15 years. Chapter 4 describes diurnal patterns in adolescents’ screen-based behaviours and examines their association with social context on weekdays and weekend days. Chapter 5 examines the association of diary-assessed screen behaviours with physical activity, sedentary behaviour and sleep in adolescents, and explores whether associations vary by sex. Findings suggest sedentary and screen behaviour increase as children and adolescents age, suggesting that interventions may be appropriate to limit these behaviours. However, there is a change in device use as adolescents age and the distribution of time differs across the day, and with particular members of the social context, depending on the behaviour of interest. Screen behaviours may displace time spent in physical activity, sedentary behaviour and sleep, suggesting that targeted strategies to reduce time spent in specific screen-behaviours may be valuable as part of a package of measures to promote physical activity in adolescents.

Item Type: Thesis (Doctoral)
Faculty \ School: Faculty of Medicine and Health Sciences > School of Health Sciences
Depositing User: Chris White
Date Deposited: 01 Dec 2022 14:10
Last Modified: 01 Dec 2022 14:10

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