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Objective: The socio-ecological milieu of children's physical activity is changing, perhaps causing perturbations within the causal 'web' that explains physical activity behaviours. It is unclear if the relative importance of parental role modelling is changing. Accordingly, this study examined associations of child-perceived parent physical activity and children's sport participation in 1985 and 2004. Methods: In 1985 (179 girls, 211 boys) and 2004 (210 girls, 218 boys), Australian schoolchildren (9-15 years) in the same eight schools were surveyed on sport participation and perceptions of parents' physical activity. Results: In the 1985 sample, girls with active fathers played more sport. In 2004, boys and girls with active fathers or active mothers reported higher sport participation. In 1985, there were no differences in sport participation between those with both, either or neither parent active. In 2004, sport participation was highest among boys and girls with both parents active. Conclusions: These results underscore the current role of parents as socialising agents for physical activity. Implications: Intervention design should be founded on the most recent evidence of children's physical activity correlates. Key words: children, physical activity, sport, role modelling, parents. doi: 10.1111/j.1753-6405.2010.00617.x

Objective: This study aimed to explore sleep duration in young Australians on different types of days across weight classes. Methods: Use of time and anthropometric data were collected on 8,866 nights from 3,884 9-18 year old Australians. The association between sleep duration and weight status was examined using factorial ANOVA for four day types: S-S (to bed and waking on school days); S-NS (to bed on school day and waking on non-school day); NS-NS (to bed and waking on non-school days); NS-S (to bed on non-school day and waking on school day). Results: Sleep duration varied with weight status when all day types were considered together (p=0.0-012). Obese adolescents slept less than normal and underweight adolescents. However, the relationship varied for different day types; with the strongest relationship for NS-S days (on which obese children slept 65 min less than very underweight children, p Conclusions: The association between weight status and sleep duration showed consistent gradients across weight categories, but only for certain day types. Implications: These patterns cast light on the direction of causation in the obesity-sleep duration relationship. Findings suggest that short sleep duration contributes to obesity, or that a third unidentified factor has an impact on both. Key words: sleep, adolescent, overweight, obese, children. Aust NZ J Public Health. 201 O; 34:165-71 doi: 10.1111/j.1753-6405.2010.00502.x

Objective: To describe trends in health attitudes and self-perceptions among school-age South Australians between 1985 and 2004. Methods: The questionnaire from the 1985 Australian Schools Health and Fitness Survey was administered during 2004 in those South Australian schools that participated in the 1985 survey. Using chi square, responses were compared for 10-15 year-olds (1985, n=398; 2004, n=467) on attitudes to: visiting the doctor and dentist, smoking, sleep, diet, exercise, stress, having friends, and knowledge about fitness and health. Additionally, self-perceptions of health and fitness were compared. Results: Among boys and girls between 1985 and 2004, there were significant declines in the perceived importance of regularly visiting the dentist and doctor, but improved attitudes to being a non-smoker. Among boys, the perceived importance of sleep and diet declined between surveys. A smaller percentage of boys and girls in the latter survey perceived their current health status as 'good'. In the lower SES sample, the percentage of girls rating healthy diet as 'very important' was lower in 2004. Conclusions: There have been general declines in perceived importance of many health-related behaviours among South Australian youth between 1985-2004. In contrast, the perceived importance of not smoking was higher in 2004 than 1985. Implications: The relative success of anti-smoking campaigns targeting youth suggests that health education must be accompanied by broader environmental support in order to effect positive behavioural change. Key words: children; health; health attitudes; trends.

Objective: To compare rates of change in South Australian children's body composition between 1997 and 2002 in subsamples based on location of residence and socioeconomic status. Methods: Year 6 children from randomly selected South Australian schools in 1997 (32 schools, n=1,423) and 2002 (29 schools, n=992) were compared on: body mass index (BMI), sum of triceps and abdominal skinfolds (skinfold sum) and waist girth. Samples were partitioned into urban (population >20,000) and rural ( Results: Between surveys, there were significant increases in boys' waist girth (p=0.004) and skinfold sum (p=0.007), and girls' BMI (p=0.0005) and skinfold sum (p Conclusions: Secular trends in Australian children's body fatness are continuing. Further, the rates of change in girls are affected by the socio-demographic milieu. Implications: The development of targeted interventions to combat child obesity will depend on a clearer understanding of how environmental influences on weight status are distributed across the socio-demographic landscape.