Anorexia athletica in pre-professional ballet dancers

Competitive sport has been under increasing discussion as a possible favourable factor in the development of eating disorders among children and adolescents. The aim of this study was to determine the frequency of sport-specific eating disorders, in line with the concept of anorexia athletica. This prospective field study included one experimental group and two control groups (disease and healthy). Fifty-two pre-professional ballet dancers aged 13-20 years were tested for clinical eating disorders, anorexia athletica criteria, eating disorder related psychopathology and self-concept, and were compared with 52 patients with anorexia nervosa and 44 non-athletic controls of the same age. The study was conducted using semi-structured interviews as well as self-report questionnaires. A clinical eating disorder diagnosis was made in 1.9% of the ballet dancers versus 0% of the high school students; anorexia athletica was diagnosed in 5.8% of the dancers versus 2.3% of the students. Ballet dancers scored lower than patients with anorexia nervosa with regard to eating disorder related psychopathology and higher than the patients with regard to self-concept. We conclude that more sensitive tools to differentiate between sport-specific (eating) patterns, anorexia athletica and clinically relevant eating disorders are needed, especially for aesthetic sports such as ballet. It remains an important goal to identify athletes with symptoms of anorexia athletica irrespective of their physique and/or sport.     

3. Alfred K. Treml: Allgemeine Pädagogik. Grundlagen, Handlungsfelder und Perspektiven der Erziehung

Ohne Zusammenfassung     

Father Absence in Pregnancy or During Childhood and Pubertal Development in Girls and Boys: A Population-Based Cohort Study

This cohort study, including 15,810 children born 2000–2003 in Denmark, aimed to investigate the association between father absence in pregnancy or during childhood and pubertal development in girls and boys. The children were followed from 11 years of age and throughout pubertal development. Mean age differences according to exposure groups were estimated for each pubertal marker separately and for a combined pubertal marker. The results suggested that father absence in pregnancy and during childhood was associated with earlier pubertal development in girls, and father absence from late childhood was associated with earlier pubertal development in boys. The paternal investment theory, the psychosocial acceleration theory and the energetics theory were explored, and did not seem to explain the observed associations.     

Global production networks, knowledge diffusion, and local capability formation

This paper develops a conceptual framework that explores the linkage between the evolution of global production networks (GPN), the role of network flagships in transferring knowledge, and the formation of capabilities by local suppliers. GPN are a major innovation in the organization of international business. These networks combine concentrated dispersion of the value chain across the boundaries of the firm and national borders, with a parallel process of integrating hierarchical layers of network participants. The network flagships transfer both explicit and tacit knowledge to local suppliers through formal and informal mechanisms. This is necessary to upgrade the local suppliers’ technical and managerial skills, so that they can meet the flagships’ specifications. We also examine how GPN can act as mediators in the capability formation of local suppliers.     

Effectiveness of interventions adopting a whole school approach to enhancing social and emotional development: a meta-analysis

This article presents findings from a meta-analysis which sought to determine the effectiveness of interventions adopting a whole school approach to enhancing children and young people’s social and emotional development. Whole school interventions were included if they involved a coordinated set of activities across curriculum teaching, school ethos and environment, and family and community partnerships. A total of 45 studies (30 interventions) involving 496,299 participants were included in the analysis. Post-intervention outcomes demonstrated significant but small improvements in participants’ social and emotional adjustment (d = 0.220), behavioural adjustment (d = 0.134), and internalising symptoms (d = 0.109). Interventions were not shown to impact on academic achievement. Origin of study and the inclusion of a community component as part of a whole school approach were found to be significant moderators for social and emotional outcomes. Further research is required to determine the active ingredients of whole school interventions that we can better understand the components necessary to achieve successful outcomes.

     

Motivation and learning in an online, unmoderated, mathematics workshop for teachers

As hypermedia, online teacher professional development (TPD) should ideally support diverse learners to work with online content effectively because it involves multiple representations and a nonlinear format. Differences among participants in motivation and learning provide challenges for design. The present study is a use-inspired, mixed-method study of 164 teachers’ motivation and learning in an unmoderated online workshop. It addresses participants’ demographic and motivational profiles, participation in this type of workshop (e.g., the frequency, duration, and focus, as well as their work with technology-enhanced, nonroutine challenge problems and journal assignments), the predictive value of the initial questionnaire, and implications for design. Findings indicate that while three clusters of motivational profiles could be identified (low interest, low self-efficacy, and less math; low interest, high self-efficacy, and more math; high interest, high self-efficacy, and more math), whether the teachers continue to participate appears to be related to the structure and content of the workshop, not just these profiles. Findings are interpreted as suggesting that the potential of hypermedia lies in its designers’ abilities to support participant stake by providing for multiple ways into thinking and working with disciplinary content—design that both accommodates and supports those with differing strengths and needs. Implications for studying motivation and learning online are also discussed.