Introduction
Physical activity has been associated with numerous health benefits during childhood and adolescence.1 Sport is one of the most popular forms of physical activity worldwide,2 it contributes 55–65% of daily moderate to vigorous energy expenditure in youth,3 ,4 and conveys a range of psychosocial health benefits that are over and above those attributable to physical activity.5 ,6 However, as 20–30% of children in the UK, the USA and Australia do not participate in sport,7–9 and participation rates decline dramatically as children age, it is essential to investigate the barriers preventing participation in youth sport.10 ,11 Much of the current research focuses on reasons for participation and dropout.11–13 However, the understanding of barriers preventing participation from the child or adolescent's perspective is important. The ecological model of health behaviour was developed to ‘emphasize the environmental and policy concepts of behaviour, while incorporating social and psychological influences’.14 The social–ecological model of physical activity (EMPA) was developed from this, and ‘portrays physical activity behaviour as being influenced by interplay between environmental settings and biological and psychological factors’,15 providing a framework for designing and evaluating physical activity and other health-related behavioural interventions. The model comprises four main domains: intrapersonal (individual beliefs, knowledge, skills, age), social environment (relationships, culture, society), physical environmental (natural or man-made environments) and policy (legislation). Barriers to sports participation may fall into any of these domains. A review of the relatively small amount of research in the area found that adolescents perceived social and intrapersonal factors to be the most prominent barriers to sports participation.16 However, these studies involved cross-sectional research designs, and there is no research into how perceived barriers to participation change over time in the same children, and data on children's barriers (rather than adolescents’) is lacking.16 Barriers would be expected to change as children develop both physically and socially; what they gain in motor skills and sports knowledge17 may be tempered by a new awareness of social standing and peer influence.18
In our recent prospective study in an English birth cohort,19 continued participation in sports clubs between the ages of 9 and 12 years was associated with decreased adiposity. This finding is particularly important given the high prevalence of obesity and associated negative outcomes among youth.9 Additionally, this finding suggests that individuals with increased adiposity may be less likely to participate in sports, and body-related or social barriers may be particularly prominent in this group.20 Similar barriers may be more evident among females,21 as girls and young women are less physically active and take part in less sport than their male peers.22 ,23
The novel aim of this study was to investigate how perceived barriers to participation in school and outside-school sports clubs change in the same cohort over 3 years. This information would allow interventions to be tailored to the specific needs of children and adolescents at a time of high risk of dropout. Three main hypotheses were tested: (1) perceived barriers will change from 9 to 12 years; (2) overweight children will perceive different barriers to children of healthy weight and (3) girls will perceive different barriers than boys.