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Life stress and cortisol reactivity: An exploratory analysis of the effects of stress exposure across life on HPA-axis functioning
Stressful experiences affect biological stress systems, such as the hypothalamic–pituitary–adrenal (HPA) axis. Life stress can potentially alter regulation of the HPA axis and has been associated with poorer physical and mental health. Little, however, is known about the relative influence of stressors that are encountered at different developmental periods on acute stress reactions in adulthood. In this study, we explored three models of the influence of stress exposure on cortisol reactivity to a modified version of the Trier Social Stress Test (TSST) by leveraging 37 years of longitudinal data in a high-risk birth cohort (N = 112). The cumulative stress model suggests that accumulated stress across the lifespan leads to dysregulated reactivity, whereas the biological embedding model implicates early childhood as a critical period. The sensitization model assumes that dysregulation should only occur when stress is high in both early childhood and concurrently. All of the models predicted altered reactivity, but do not anticipate its exact form. We found support for both cumulative and biological embedding effects. However, when pitted against each other, early life stress predicted more blunted cortisol responses at age 37 over and above cumulative life stress. Additional analyses revealed that stress exposure in middle childhood also predicted more blunted cortisol reactivity.
Journal Article
Race and SES Differences in Psychosocial Resources: Implications for Social Stress Theory
Social stress theory predicts that psychosocial resources shape health inequalities but is less clear about the ways in which the availability of resources differs across racial and socioeconomic groups. Using data from the Nashville Stress and Health Study (N = 1,214), the present study assessed racial and socioeconomic status (SES) differences in mastery, self-esteem, and social support; evaluated the extent to which SES accounts for racial differences in resources; and considered the interactive roles of race and SES in shaping resources among Black and White adults. Results show Blacks have greater access to resources, but SES yields greater psychosocial benefits among Whites. Findings demonstrate that SES and race may jointly and independently shape access to resources. This study contributes to the broader literature on status distinctions in psychosocial resources, providing new insights into the ways in which race and SES shape access to these health-protective resources while also raising several questions for future research.
Journal Article
The positive social worker
\"Developed from the author's own experiences in social work and social work education, this book considers alternative approaches for social workers in dealing with the extensive demands, persistent pressures, and stress that they may face in their daily working lives. The Positive Social Worker is firmly located in an individual, group, organisational, cultural and socio-political context. It considers and celebrates concepts linked to the importance, and sources, of work-related well-being. Individual chapters describe and critically analyse the social work context, the role of hope, optimism, commitment, resilience, support, appraisals, positive emotions and coping, self-efficacy, control and agency. Throughout clear links are made with social work practice. While the book concentrates on a UK context, it draws on literature from social work, social, organisational, work and positive psychology and sociology, from the UK, the USA, Europe, Australasia and other countries. This book should be considered essential reading for social workers, graduate and post graduate social work students, practice educators and lecturers. It will also be of relevance to professionals and professionals in training in the criminal justice and health and social care fields\"-- Provided by publisher.
Book
Effects of a 12-week endurance training program on the physiological response to psychosocial stress in men: a randomized controlled trial
The present study experimentally tested the cross-stressor adaptation hypothesis by examining whether endurance exercise training leads to reductions in the physiological stress response to a psychosocial stressor. We randomly assigned 149 healthy men to a 12-week exercise training, relaxation training, or a wait list control group. Before and after intervention we assessed the groups’ physical fitness (lactate testing) and compared their physiological stress responses to the Trier Social Stress Test for Groups in terms of salivary free cortisol, heart rate (HR) and heart rate variability (HRV); the final sample consisted of 96 subjects. As hypothesized, the exercise training significantly improved fitness and reduced stress reactivity in all three parameters; however, it only improved stress recovery in terms of HR. The relaxation program reduced only cortisol, but not HR or HRV reactivity; no changes emerged for the control group. The findings suggest that the cross-stressor adaptation hypothesis is valid for cardiovascular as well as endocrine stress reactivity.
Journal Article
The stressed prefrontal cortex and goal-directed behaviour: acute psychosocial stress impairs the flexible implementation of task goals
Goals are often at the basis of human actions. As an essential mechanism of behavioural adaptation, individuals need to be able to flexibly implement new task goals so as to alter their actions (switch tasks) in response to contextual changes. The present study investigated the effect of acute psychosocial stress on cognitive control processes of flexible task-goal implementation with temporal focus on the occurrence interval of the hypothalamus–pituitary–adrenal (HPA) stress response. For this, forty-eight healthy volunteers were either challenged with a standardised stress-induction protocol (the Trier Social Stress Test) or underwent a standardised control situation. Subsequently, they were exposed to a task-switching procedure with two tasks alternating in random order. Participants of the stress group displayed increased salivary α-amylase activity immediately after stress exposure as well as elevations of salivary cortisol from 10 min after stress cessation, reflecting the typical stress-related activity increases in the sympathetic nervous system and the HPA axis, respectively. At the time interval of elevated cortisol levels, stressed individuals persistently showed larger performance differences between task switches and task repetitions (switch costs) than controls. This effect was reliably evident when tested 5–20 min as well as 25–40 min following treatment cessation. These results indicate that acute psychosocial stress impairs cognitive control processes of flexible task-goal implementation essential for voluntary goal-directed behaviour.
Journal Article
Childhood maltreatment disrupts HPA-axis activity under basal and stress conditions in a dose–response relationship in children and adolescents
Abstract Background. This study investigates the impact of childhood maltreatment (CM) on hypothalamic- pituitary-adrenal (HPA)-axis functioning and on anxiety perception. Moreover, the influence of CM severity and frequency was also explored. Methods. In total, 187 participants aged 7-17 were assessed for CM history using validated questionnaires and ad hoc interviews to be classified according to the criteria of the Tool for Assessing the Severity of Situations in which Children are Vulnerable (TASSCV). Psychopathology was ascertained using the K-SADS-PL5. To assess HPA-axis functioning, salivary cortisol samples were collected throughout a normal day and during an acute psychosocial stressor, the Trier Social Stress Test for children (TSST-C). Subjective anxiety was evaluated using STAI/-C. Results. Youth with a CM history had higher overall diurnal cortisol levels ( p = 0.001), blunted cortisol response to acute psychosocial stress ( p = 0.002) and greater perceived anxiety ( p = 0.003), than those without CM. Specifically, participants exposed to moderate/severe or often/frequent CM showed the greater diurnal cortisol output ( pseverity = 0.002; pfrequency = 0.003), and blunted cortisol response during the TSST-C ( pseverity = 0.006; pfrequency = 0.008). Meanwhile, youth with low CM severity/frequency exhibited a similar cortisol response to those without CM. However, perceived anxiety was higher in those exposed to CM ( p < 0.001), regardless of its severity/frequency. Conclusions. Disturbances in HPA-axis functioning are already evident early after CM exposure, while psychological and physiological responses to an acute stressor are dissociated in youth exposed to CM. The dose-response relationship described in this paper highlights the need to comprehensively evaluate CM so that vulnerable children can be identified and assigned to proper interventions.
Journal Article