Abstract
Introduction: The decline in physical activity (PA) from childhood to adolescence is stark and often accompanied by an increase in sedentary behaviours. Preventing or attenuating this decline represents a potential public health intervention strategy. While an overall decline is well-documented, little is known of how different elements of PA change. Using individually-validated items from a standard questionnaire (Physical Activity Questionnaire for Adolescents: PAQ-A) and self-reported screen-time we investigated changes in different elements of PA and sedentary behaviour over two years in participants aged eleven at baseline.
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