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Summary: The hypothalamic–pituitary–adrenal (HPA)-axis is a central component of the body''s neuroendocrine response to stress. Its major end-product cortisol has profound effects on mood and behavior. Although it has often been suggested, it remains unknown whether differences in HPA-axis physiology are part of an individual''s vulnerability to psychopathology, and constitute a causal factor in its development. In order to study the contribution of HPA-axis physiology to the development of psychopathology, we measured HPA-axis physiology in a community-cohort of 1768 10–12 year-old children. The aims of the here presented study were twofold: (1) to obtain data on HPA-axis function in a large cohort of pre- and early-adolescent children, both in terms of total hormonal output and in terms of the dynamics of cortisol secretion (by means of the cortisol awakening response); and (2) to study potential confounders of the cortisol-psychopathology relationship in this age group, such as season of sampling, age, gender, pubertal development, perinatal variables and BMI. We found a wide interindividual variability in HPA-axis function. An increase in cortisol in the first 30min after awakening was present in 70.7% of children, but the increase appears lower in children than in adults. In addition, this study suggests that season of sampling and gender may act as potential confounders in the cortisol-psychopathology relationship. We will follow these children longitudinally for the development of psychopathology in the period from childhood into adulthood. This period covers adolescence, which is a critical time for the appearance and development of psychiatric disorders. [Copyright &y& Elsevier]

Background: Episode duration in non-psychotic mental illness is associated with personal characteristics of patients, like age or personality. Part of these links may be mediated by life change, a predictor of episode duration in its own right. Methods: In 170 primary care patients who suffered 4171 person-months of non-psychotic mental illness diagnosed according to Bedford College Criteria, we examined to what extent associations with episode duration of nine person-linked variables including personal vulnerability, coping styles and social support, are mediated by their effects on the occurrence, during episodes, of positive life changes (PLC) assessed using the Life Events and Difficulties Schedule. Cox regression for competing endpoints was used to analyse the simultaneous effects of baseline variables on PLC and on remission, whether spontaneous or not. Results: Irrespective of diagnosis and symptom intensity, PLC during episodes increases remission rates 2.9-fold (P<0.001). Remission rates are higher in patients with larger social networks and who seek more help but this is partly because such persons experience more PLC earlier during episodes. Lower neuroticism is also linked with shorter episode duration but this effect is unmediated by PLC. Limitations: Mental state may bias dating and reporting of life change. Treatment aspects were not recorded. Elderly subjects were not included. Conclusion: PLC occurrence during common mental illness is associated with psychosocial variables which are also overall predictors of episode remission. Thus, PLC mediates between patients’ psychosocial make-up and their chances of speedy recovery. This has implications for the management of non-psychotic mental illness. [Copyright &y& Elsevier]

Longitudinal data from multiple cohorts may be analyzed by Bayesian research synthesis. Here, we illustrate this approach by investigating the development of self-control between age 13 and 19 and the role of sex therein in a multi-cohort, longitudinal design. Three Dutch cohorts supplied data: the Netherlands Twin Register (NTR; N = 21,079), Research on Adolescent Development and Relationships-Young (RADAR-Y; N = 497), and Tracking Adolescents' Individual Lives Survey (TRAILS; N = 2229). Self-control was assessed by one measure in NTR and RADAR-Y, and three measures in TRAILS. In each cohort, we evaluated evidence for competing informative hypotheses regarding the development of self-control. Subsequently, we aggregated this evidence over cohorts and measures to arrive at a robust conclusion that was supported by all cohorts and measures. We found robust evidence for the hypothesis that on average self-control increases during adolescence (i.e., maturation) and that individuals with lower initial self-control often experience a steeper increase in self-control (i.e., a pattern of recovery). From self-report, boys have higher initial self-control levels at age 13 than girls, whereas parents report higher self-control for girls. [ABSTRACT FROM AUTHOR]

Abstract: Although it has often been suggested that physical activity and depression are intertwined, only few studies have investigated whether specific aspects of physical activity predict the incidence of major depression in adolescents from the general population. Therefore the aim of this study was to investigate the effects of nature, frequency, duration and intensity of physical activity during early adolescence on the onset of a major depressive episode in early adulthood. In a population sample of adolescents (N = 1396), various aspects of physical activity were assessed at early adolescence (mean age 13.02, SD = 0.61). Major depressive episode onset was assessed using the Composite International Diagnostic Interview. A Cox regression model was performed to investigate whether physical activity characteristics and their interactions with gender predicted a major depressive episode onset up until mean age 18.5 (SD = 0.61). The individual characteristics of physical activity (nature, frequency, duration and intensity) or their interactions with gender did not predict a major depressive episode onset (p values >0.05). So far, there is no prospective evidence that physical activity protects against the development of adolescent depressive episodes in either boys or girls. [Copyright &y& Elsevier]