Explaining the effects of a 1-year intervention promoting physical activity in middle schools: a mediation analysis

Objective : The aim of the present study was to examine the mediation effects of changes in psychosocial determinants of physical activity (attitude, social support, self-efficacy, perceived benefits and barriers) on changes in physical activity.

Design : One-year intervention study with baseline and 1-year post measures of physical activity habits and psychosocial correlates.

Setting : Fifteen middle schools. Subjects : Boys and girls (n = 2840) aged 11–15 years completed the validated questionnaires during class hours.

Results : The product-of-coefficients test was used to asses the mediating effects. Self-efficacy for physical activity at school was found to be the only significant mediator of physical activity change. Specifically, self-efficacy for physical activity at school partly mediated the effect of the intervention on total and school-related physical activity change in the intervention group with parental support (P < 0.05). None of the other potential mediators, attitudes, social support, perceived benefits and perceived barriers, seemed to have had a positive effect. Even a suppressor effect was found for attitudes. Given that the effects of self-efficacy and attitudes were of opposite direction, the total mediated/suppressed effects of the intervention were not statistically significant.

Conclusions : Positive changes in total and school-related physical activity in adolescents could be partly explained by increases in self-efficacy for physical activity at school through a physical activity intervention in middle schools with parental support. However, the suppressor effect of attitudes decreased this effect. As this is one of the first true mediation analyses in this age group, further research is needed to replicate the importance of these mediators.

Investigating the media power of a population health monitoring survey: case study of the NSW Schools Physical Activity and Nutrition Survey (SPANS)

Objective
To examine the extent and nature of news coverage of a government-funded population monitoring survey of children and the potential implications of this coverage for public health advocacy.

Methods
Case study of the NSW Schools Physical Activity and Nutrition Survey (SPANS), a population monitoring survey of school-aged children's weight and weight-related behaviours, conducted in 1997, 2004 and 2010. Printed news items from all Australian newspapers between January 1997 and December 2011 mentioning the survey findings were identified from the Factiva database and a descriptive analysis of the content conducted.

Results
Overall, 144 news items were identified. The news angles focused mainly on physical activity/sedentary behaviour; overweight/obesity and nutrition; however these angles changed between 1997 and 2011, with angles focused on physical activity/sedentary behaviour increasing, compared with overweight/obesity and nutrition angles (p=0.001). Responsibility for obesity and weight-related behaviours was most frequently assigned to parents and food marketing, and the most common solutions were policy strategies and parental/child education and support.

Conclusions
Population health surveys are newsworthy and when coupled with strategic dissemination, media can contribute to communicating health issues and interpreting findings in ways that are relevant for consumers, policy makers and stakeholders.

Implications
This case study emphasises the news value of government-funded population surveys, while providing a cautionary note about media focus on individual studies rather than a larger body of research evidence.

Protecting and promoting mental health in the workplace : developing a systems approach to job stress

Issue addressed: Job stress has been linked to a wide range of adverse effects on mental, physical, and organisational health. Despite the evidence that systems approaches are most effective in reducing the adverse impact of job stress, prevalent practice is dominated by worker- or individual-focused strategies in the absence of commensurate intervention on working conditions. Methods: A literature review and cross-disciplinary conceptual synthesis were combined in the articulation of a systems approach to job stress. Results: An outline of the job stress process is followed by explanation of how a systems approach addresses the various steps in the stress process. Systems approaches to job stress emphasise primary prevention or focusing on stressors as the upstream determinants of job stress. Additionally, systems approaches integrate primary with worker-directed secondary and illness-directed tertiary intervention, include the meaningful participation of groups targeted by intervention, and are context- sensitive. Systems approach intervention principles are illustrated by concrete examples of intervention strategies and activities. Conclusions: Further efforts are needed to promote, disseminate, implement, and evaluate systems approaches to job stress and to improve cross-disciplinary cooperation in this effort. (author abtract)

Protecting and promoting mental health in the workplace: developing a systems approach to job stress

Issue addressed: Job stress has been linked to a wide range of adverse effects on mental, physical, and organisational health. Despite the evidence that systems approaches are most effective in reducing the adverse impact of job stress, prevalent practice is dominated by worker- or individual-focused strategies in the absence of commensurate intervention on working conditions. Methods: A literature review and cross-disciplinary conceptual synthesis were combined in the articulation of a systems approach to job stress. Results: An outline of the job stress process is followed by explanation of how a systems approach addresses the various steps in the stress process. Systems approaches to job stress emphasise primary prevention or focusing on stressors as the upstream determinants of job stress. Additionally, systems approaches integrate primary with worker-directed secondary and illness-directed tertiary intervention, include the meaningful participation of groups targeted by intervention, and are context- sensitive. Systems approach intervention principles are illustrated by concrete examples of intervention strategies and activities. Conclusions: Further efforts are needed to promote, disseminate, implement, and evaluate systems approaches to job stress and to improve cross-disciplinary cooperation in this effort.

An empirical study on accountability for promoting healthy food environments in England through the public health responsibility deal food network

Objective: In 2011, the United Kingdom launched five Public Health Responsibility Deal Networks inspired by ‘nudge theory’ to facilitate healthy-lifestyle behaviors. This study used Q methodology to examine stakeholders’ views about responsibility and accountability for healthy food environments to reduce obesity and diet-related chronic diseases. Design: A purposive sample of policy elites (n=31) from government, academia, food industry and civil society sorted 48 statements grounded in three theoretical perspectives (i.e., legitimacy, nudge and public health law). Factor analysis identified intra-individual statement sorting differences. Results: A three-factor solution explained 64 percent of the variance across three distinct viewpoints: food environment protectors (n=17) underscored government responsibility to address unhealthy food environments; partnership pioneers (n=12) recognized government-industry partnerships as legitimate; and the commercial market defenders (n=1) emphasized individual responsibility for food choices and rejected any government intervention. Conclusions: Building trust and strengthening accountability structures may help stakeholders navigate differences to engage in constructive actions. This research may inform efforts in other countries where voluntary industry partnerships are pursued to address unhealthy food environments.