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Activity mediates conscientiousness' relationship to diurnal cortisol slope in a national sample.

ABSTRACT: OBJECTIVE:The present study explored pathways from the personality traits of neuroticism and conscientiousness through health-related behaviors to diurnal patterns of the stress hormone cortisol using data from a large national study. METHOD:Using prospective data from the Midlife in the United States (MIDUS II) study and the National Study of Daily Experiences (NSDE II, a MIDUS substudy), hierarchical linear modeling (HLM) and Monte Carlo estimation for multilevel model mediation were used to test direct and indirect effects (via general activity level, moderate and vigorous physical activity, lifetime history of regular smoking, and alcohol consumption) of neuroticism and conscientiousness on cortisol at wakeup, diurnal cortisol slope, and cortisol awakening response (N = 960). RESULTS:Initial HLM models showed greater levels of conscientiousness were associated with steeper (i.e., healthier) diurnal cortisol slope. Consistent with a hypothesized indirect biobehavioral pathway, when controlling for demographic factors, cortisol-related medications, daily stressors, and positive affect, HLM models showed the relationship between conscientiousness and diurnal cortisol slope was mediated by general activity levels. Lifetime history of smoking was associated with flatter diurnal cortisol slope, but did not mediate the effect of conscientiousness on diurnal cortisol slope. No effects were found for neuroticism. CONCLUSIONS:The results support a psychophysiological model of resilience--one that provides a more complete rendering of the health-protective mechanisms of conscientiousness via hypothalamic-pituitary-adrenal axis functioning. Specifically, the mediated pathway suggests greater engagement in the activities of day-to-day life are an instrumental means by which conscientious individuals experience healthier patterns of stress hormone secretion.

SUBMITTER: Bogg T

PROVIDER: S-EPMC4666824 | biostudies-literature | 2015 Dec

REPOSITORIES: biostudies-literature

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Project description:Inter-individual variability in metrics of hypothalamic-pituitary-adrenocortical (HPA) activity, such as the slope of the diurnal decline in cortisol, cortisol awakening response (CAR), and total cortisol output, have been found to associate inversely with trait ratings of extraversion and positive affect (E/PA) and positively with neuroticism and negative affect (N/NA) in some, but not all, investigations. These inconsistencies may partly reflect varied intensity of cortisol sampling among studies and reliance on self-rated traits, which are subject to reporting biases and limitations of introspection. Here, we further examined dispositional correlates of HPA activity in 490 healthy, employed midlife volunteers (M age=43 years; 54% Female; 86% white). Trait ratings were requested from participants and 2 participant-elected informants using the Positive and Negative Affect Schedule (PANAS) and Extraversion and Neuroticism dimensions of NEO personality inventories. CAR was assessed as percent increase in cortisol levels from awakening to 30min after awakening; and the diurnal slope and total output of cortisol [Area Under the Curve (AUC)] were determined from cortisol measurements taken at awakening, +4 and +9h later, and bedtime, across 3 workdays. Structural equation modeling was used to estimate multi-informant E/PA and N/NA factors. We used 3days of measurement as indicators to model each of the three latent cortisol factors (slope, CAR, and AUC). With the two latent emotionality and three latent cortisol indices included there was good fit to the data (?(2)(200)=278.38, p=0.0002; RMSEA=0.028, 90% CI=0.02-0.04; CFI/TLI=0.97/0.96; SRMR=0.04). After controlling for covariates (age, sex, race), results showed higher latent E/PA associated with a steeper diurnal slope (Standardized ?=-0.19, p=0.02) and smaller CAR (Standardized ?=-0.26, p=0.004), whereas N/NA did not associate with any cortisol metric (Standardized ?'s=-0.12 to 0.13, p's=0.10 to 0.53). These findings suggest that positive emotionality may be more closely associated with indices of diurnal cortisol release than negative emotionality.

Project description:Abnormal hypothalamic-pituitary-adrenal (HPA) axis function, as indexed by elevated diurnal cortisol levels and/or a blunted cortisol awakening response (CAR), has been observed among patients with first episode psychosis and associated with neurocognitive deficits in this population. However, the extent to which these features precede illness onset is unclear. The current study aimed to determine whether children who are at putatively elevated risk for psychosis because they present multiple antecedents of schizophrenia (ASz), and high-risk children with a family history of illness (FHx), are characterized by abnormal cortisol levels when compared with their typically developing (TD) peers. A further aim was to investigate the extent to which cortisol levels are associated with psychosocial stress and neurocognitive function. Thirty-three ASz children, 22 FHx children, and 40 TD children were identified at age 9-12 years using a novel community-based screening procedure or as relatives of individuals with schizophrenia. All participants were antipsychotic-naive and not currently seeking treatment for their symptoms. At age 11-14 years, participants provided salivary cortisol samples and completed psychosocial stress measures and tests of memory and executive function. Results indicated that FHx children, but not ASz children, were characterized by a blunted CAR relative to their TD peers (effect size=-0.73, p=0.01) that was not explained by psychosocial stress exposure or by distress relating to these experiences. Neither FHx nor ASz children were characterized by elevated diurnal cortisol. Among both FHx and ASz children, more pronounced HPA axis function abnormalities (i.e., higher diurnal cortisol levels and greater blunting of the CAR) were associated with poorer performance on tests of verbal memory and executive function. These findings support the notion that at least some HPA axis abnormalities described in psychosis precede illness onset, rather than being a subsequent epiphenomenon. We speculate that the blunted CAR may constitute an early (potentially genetically mediated) marker of psychosis vulnerability, whilst elevated diurnal cortisol levels may emerge only proximally to disease onset.

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Activity mediates conscientiousness' relationship to diurnal cortisol slope in a national sample.

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