Laura R. Stroud

Smoking, Stress, and Negative Affect: Correlation, Causation, and Context Across Stages of Smoking

This transdisciplinary review of the literature addresses the questions, Do stress and negative affect (NA) promote smoking? and Does smoking genuinely relieve stress and NA? Drawing on both human and animal literatures, the authors examine these questions across three developmental stages of smoking--initiation, maintenance, and relapse. Methodological and conceptual distinctions relating to within- and between-subjects levels of analyses are emphasized throughout the review. Potential mechanisms underlying links between stress and NA and smoking are also reviewed. Relative to direct-effect explanations, the authors argue that contextual mediator-moderator approaches hold greater potential for elucidating complex associations between NA and stress and smoking. The authors conclude with recommendations for research initiatives that draw on more sophisticated theories and methodologies.

Sex differences in stress responses: Social rejection versus achievement stress

BACKGROUND Sex differences in stress responses may be one mechanism underlying gender differences in depression. We hypothesized that men and women would show different adrenocortical responses to different stressors. In particular, we predicted that women would show greater responses to social rejection stressors, whereas men would demonstrate greater responses to achievement stressors. METHODS Following a rest session in which they habituated to the laboratory, 50 healthy volunteers (24 men and 26 women, mean age 19.1, SD = 1.13) were randomly assigned to achievement or rejection stress conditions. The achievement condition involved a mathematical and a verbal challenge; the rejection condition involved two social interaction challenges. Self-reported affect and salivary cortisol were measured throughout each stress session (baseline, stress, and poststress periods). RESULTS There were no sex differences in mood ratings following the stressors; however, cortisol responses showed the predicted gender by condition by time interaction. Men showed significantly greater cortisol responses to the achievement challenges, but women showed greater cortisol responses to the social rejection challenges. CONCLUSIONS Women appear more physiologically reactive to social rejection challenges, but men react more to achievement challenges. Womens greater reactivity to rejection stress may contribute to the increased rates of affective disorders in women.

PERCEIVED EMOTIONAL INTELLIGENCE, STRESS REACTIVITY, AND SYMPTOM REPORTS: FURTHER EXPLORATIONS USING THE TRAIT META-MOOD SCALE*

We examined the relationship between perceived emotional intelligence (PEI), measured by the Trait Meta-Mood Scale (TMMS), and psychophysiological measures of adaptive coping. The TMMS assesses perceived ability to (a) attend to moods (Attention), (b) discriminate clearly among moods (Clarity), and (c) regulate moods (Repair). Study 1 showed significant positive associations between PEI and psychological and interpersonal functioning. In Study 2, skill at mood Repair was associated with less passive coping and perceptions of repeated laboratory stressors as less threatening; Clarity was related to greater increases in negative mood, but lower cortisol release during repeated stress. In Study 3, Repair was associated with active coping and lower levels of rumination; Attention was associated with lowered cortisol and blood pressure responses to acute laboratory challenges. These findings suggest that psychophysiological responses to stress may be one potential mechanism underlying the relationship between emotional functioning and health.

Salivary α‐Amylase in Biobehavioral Research

Abstract:  In the history of science, technical advances often precede periods of rapid accumulation of knowledge. Within the past three decades, discoveries that enabled the noninvasive measurement of the psychobiology of stress (in saliva) have added new dimensions to the study of health and human development. This widespread enthusiasm has led to somewhat of a renaissance in behavioral science. At the cutting edge, the focus is on testing innovative theoretical models of individual differences in behavior as a function of multilevel biosocial processes in the context of everyday life. Several new studies have generated renewed interest in salivary α‐amylase (sAA) as a surrogate marker of the autonomic/sympathetic nervous system component of the psychobiology of stress. This article reviews sAAs properties and functions; presents illustrative findings relating sAA to stress and the physiology of stress, behavior, cognitive function, and health; and provides practical information regarding specimen collection and assay. The overarching intent is to accelerate the learning curve such that investigators avoid potential pitfalls associated with integrating this unique salivary analyte into the next generation of biobehavioral research.

Stress response and the adolescent transition: Performance versus peer rejection stressors

Little is known about normative variation in stress response over the adolescent transition. This study examined neuroendocrine and cardiovascular responses to performance and peer rejection stressors over the adolescent transition in a normative sample. Participants were 82 healthy children (ages 7-12 years, n = 39, 22 females) and adolescents (ages 13-17, n = 43, 20 females) recruited through community postings. Following a habituation session, participants completed a performance (public speaking, mental arithmetic, mirror tracing) or peer rejection (exclusion challenges) stress session. Salivary cortisol, salivary alpha amylase (sAA), systolic and diastolic blood pressure (SBP, DBP), and heart rate were measured throughout. Adolescents showed significantly greater cortisol, sAA, SBP, and DBP stress response relative to children. Developmental differences were most pronounced in the performance stress session for cortisol and DBP and in the peer rejection session for sAA and SBP. Heightened physiological stress responses in typical adolescents may facilitate adaptation to new challenges of adolescence and adulthood. In high-risk adolescents, this normative shift may tip the balance toward stress response dysregulation associated with depression and other psychopathology. Specificity of physiological response by stressor type highlights the importance of a multisystem approach to the psychobiology of stress and may also have implications for understanding trajectories to psychopathology.

Early Life Stress and Morphometry of the Adult Anterior Cingulate Cortex and Caudate Nuclei

BACKGROUND Early life stress (ELS) is linked to adult psychopathology and may contribute to long-term brain alterations, as suggested by studies of women who suffered childhood sexual abuse. We examine whether reported adverse ELS defined as stressful and/or traumatic adverse childhood events (ACEs) is associated with smaller limbic and basal ganglia volumes. METHOD 265 healthy Australian men and women without psychopathology or brain disorders were studied. ACEs were assessed by the ELSQ and current emotional state by the DASS. Anterior cingulate cortex (ACC), hippocampus, amygdala, and caudate nucleus volumes were measured from T1-weighted MRI. Analyses examined ROI volumetric associations with reported ACEs and DASS scores. RESULTS Participants with greater than two ACEs had smaller ACC and caudate nuclei than those without ACEs. A significant association between total ACEs and ROI volumes for these structures was observed. Regression analysis also revealed that ELS was more strongly associated than current emotional state (DASS) with these ROI volumes. CONCLUSIONS Reported ELS is associated with smaller ACC and caudate volumes, but not the hippocampal or amygdala volumes. The reasons for these brain effects are not entirely clear, but may reflect the influence of early stress and traumatic events on the developing brain.

Are Stress Eaters at Risk for the Metabolic Syndrome

Abstract: Stress eating is a health behavior that has been overlooked in much of health psychology research. It is largely unknown why some tend to eat during or after stressful periods, whereas others tend to lose their appetite and lose weight. Furthermore, it is unknown if such transient changes in food intake or macronutrient composition during stress have clinically significant consequences in terms of weight and metabolic health. The Brown University Medical Student Study examined students during a baseline control period as well as during two examination periods. This design enabled an examination of weight changes in self‐proclaimed stress eaters vs stress‐less eaters over time. Stress eaters tended to gain more weight and demonstrated increases in nocturnal levels of insulin, cortisol, and blood levels of total/HDL cholesterol ratio, during exam periods, controlling for the baseline control period. These data show prospectively that stress eating may indeed have short‐term consequences on metabolic health. Future research will need to determine whether this confers a greater risk of disease over time.

The Yale Interpersonal Stressor (YIPS): Affective, physiological, and behavioral responses to a novel interpersonal rejection paradigm

Given links between interpersonal functioning and health as well as the dearth of truly interpersonal laboratory stressors, we present a live rejection paradigm, the Yale Interpersonal Stressor (YIPS), and examine its effects on mood, eating behavior, blood pressure, and cortisol in two experiments. The YIPS involves one or more interaction(s) between the participant and two same-sex confederates in which the participant is made to feel excluded and isolated. In Experiment 1, 50 female undergraduates were randomly assigned to the YIPS or a control condition. Participants in the YIPS condition experienced greater negative affect and less positive affect than did those in the control condition. Further, restrained eaters ate more following the YIPS than did nonrestrained eaters. In Experiment 2, 25 male and female undergraduates completed the YIPS. The YIPS induced significant increases in tension, systolic blood pressure (SBP), and diastolic blood pressure (DBP) from baseline, while significantly decreasing positive affect. The YIPS appeared particularly relevant for women, resulting in significantly greater increases in cortisol and SBP for women compared to men. The YIPS, then, provides an alternative to traditional, achievement-oriented laboratory stressors and may allow for the identification of individuals most vulnerable to interpersonal stress.

Integrating the measurement of salivary α-amylase into studies of child health, development, and social relationships

To advance our understanding of how biological and behavioral processes interact to determine risk or resilience, theorists suggest that social developmental models will need to include multiple measurements of stress-related biological processes. Identified in the early 1990s as a surrogate marker of the sympathetic nervous system component of the stress response, salivary-amylase has not been employed to test biosocial models of stress vulnerability in the context of child development until now. In this report, we describe a standard assay that behavioral scientists can use to improve the next generation of studies and specific recommendations about sample collection, preparation, and storage are presented. More importantly, four studies are presented with mother–infant dyads (N= 86), preschoolers (N= 54), children (N = 54), and adolescents (N = 29) to illustrate individual differences in stress-related change in α-amylase levels, that patterns of α-amylase stress reactivity distinctly differ from those measured by salivary cortisol, and associations between individual differences in α-amylase and social relationships, health, negative affectivity, cognitive/academic/behavior problems, and cardiovascular reactivity. We conclude that the integration of measurements of the adrenergic component of the locus ceruleus/autonomic (sympathetic) nervous system, as indexed by salivary α-amylase, into the study of biosocial relationships may extend our understanding of child health and development to new limits.

Links between physical fitness and cardiovascular reactivity and recovery to psychological stressors : A meta-analysis

A meta-analysis of published studies with adult human participants was conducted to evaluate whether physical fitness attenuates cardiovascular reactivity and improves recovery from acute psychological stressors. Thirty-three studies met selection criteria; 18 were included in recovery analyses. Effect sizes and moderator influences were calculated by using meta-analysis software. A fixed effects model was fit initially; however, between-studies heterogeneity could not be explained even after inclusion of moderators. Therefore, to account for residual heterogeneity, a random effects model was estimated. Under this model, fit individuals showed significantly attenuated heart rate and systolic blood pressure reactivity and a trend toward attenuated diastolic blood pressure reactivity. Fit individuals also showed faster heart rate recovery, but there were no significant differences in systolic blood pressure or diastolic blood pressure recovery. No significant moderators emerged. Results have important implications for elucidating mechanisms underlying effects of fitness on cardiovascular disease and suggest that fitness may be an important confound in studies of stress reactivity.