ABSTRACT
Sedentary behaviour refers to sitting, lying or reclining during waking hours, with low levels of energy expenditure. We recognise that physical activity and sedentary behaviour are distinct behaviours. Consequently, they are likely to be influenced by different factors (correlates), and therefore may require different behaviour change theories, frameworks and intervention approaches to facilitate change. In this chapter we focus on the psychology of sedentary behaviour. Specifically, we explore the issues defining sedentary behaviour, the mental health outcomes of sedentary behaviour in young people and adults, and, briefly, how sedentary behaviour is measured. The chapter also summarises the factors that appear to influence sedentary behaviour (correlates of behaviour), key theories and models that might explain sedentary behaviour, and interventions help to change sedentary behaviour.
