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Testosterone and Proactive-Reactive Aggression in Youth: the Moderating Role of Harsh Discipline.

March 27, 2018 by IISBR

Background:

This study tests a biosocial model of the link between testosterone and proactive-reactive aggression in youth at varying levels of harsh discipline. Given that proactive aggression is used to gain power and status and the importance of social learning in its formation, we hypothesized that testosterone would be associated with proactive aggression at higher levels of harsh discipline, and that this relationship would be more pronounced in boys than girls. Participants (n = 445; 50% male; M age = 11.92 years; 80% African-American) and their caregivers completed questionnaires including demographics, conflict tactics, and proactive-reactive aggression. Youth also provided a saliva sample for testosterone. Analyses revealed an interaction between testosterone and harsh discipline on proactive aggression in both boys and girls, and an interaction between testosterone and harsh discipline on reactive aggression in boys only. For those experiencing high levels of harsh discipline, testosterone was positively associated with proactive aggression, with the magnitude of the association increasing as harsh discipline increased. For below average levels of harsh discipline, there were protective effects of high testosterone for boy’s reactive aggression and for girl’s proactive aggression. The findings support basic tenets of the biosocial model which suggest that links between testosterone and aggressive behavior are dependent on contextual forces, highlighting the complex relationship between hormones, social context, and aggression. Novel findings include protective effects of high testosterone for those exposed to low levels of harsh discipline. Findings are discussed in light of the context-contingency effect and also within the differential susceptibility framework.

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Tagged With: Biosocial, Harsh discipline, Proactive aggression, Reactive aggression, testosterone

The “yin and yang” of the adrenal and gonadal systems in elite military men.

June 27, 2017 by IISBR

Background:

We recently established daily, free-living profiles of the adrenal hormone cortisol, the (primarily adrenal) anabolic precursor dehydroepiandrosterone (DHEA) and the (primarily gonadal) anabolic hormone testosterone in elite military men. A prevailing view is that adrenal and gonadal systems reciprocally modulate each other; however, recent paradigm shifts prompted the characterization of these systems as parallel, cooperative processes (i.e. the “positive coupling” hypothesis). In this study, we tested the positive coupling hypothesis in 57 elite military men by evaluating associations between adrenal and gonadal biomarkers across the day. Salivary DHEA was moderately and positively coupled with salivary cortisol, as was salivary testosterone. Anabolic processes (i.e. salivary DHEA and testosterone) were also positively and reliably coupled across the day. In multivariate models, salivary DHEA and cortisol combined to account for substantial variance in salivary testosterone concentrations across the day, but this was driven almost exclusively by DHEA. This may reflect choreographed adrenal release of DHEA with testicular and/or adrenal release of testosterone, systemic conversion of DHEA to testosterone, or both. DHEA and testosterone modestly and less robustly predicted cortisol concentrations; this was confined to the morning, and testosterone was the primary predictor. Altogether, top-down co-activation of adrenal and gonadal hormone secretion may complement bottom-up counter-regulatory functions to foster anabolic balance and neuronal survival; hence, the “yin and yang” of adrenal and gonadal systems. This may be an adaptive process that is amplified by stress, competition, and/or dominance hierarchy.

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Tagged With: Anabolic, cortisol, dehydroepiandrosterone, Endocrine, miliatry, positive coupling, salivary dhea, testosterone

Anabolic hormone profiles in elite military men: Robust associations with age, stress, and fatigue.

June 11, 2017 by IISBR

Background:

We recently established stable daily profiles of the anabolic hormones dehydroepiandrosterone (DHEA) and testosterone in 57 elite military men. In this follow-on study, we explored associations of salivary anabolic hormone profiles with demographic (i.e., age, body mass index [BMI]) and biobehavioral health indices (i.e., blood pressure, sleep, perceived stress, fatigue) via correlational models. Next, nuanced patterns were constructed using quartile splits followed by one-way analysis of variance and post hoc subgroup comparisons. Both DHEA (r range: -0.33 to -0.49) and testosterone (r range: -0.19 to -0.41) were inversely associated with age. Quartile comparisons revealed that age-related declines in DHEA were linear, curvilinear, or sigmoidal, depending on the summary parameter of interest. Anabolic hormone profiles did not associate with BMI, blood pressure, or sleep efficiency. Robust linear associations were observed between testosterone and perceived stress (r range: -0.29 to -0.36); concentration-dependent patterns were less discernible. Lower DHEA (r range: -0.22 to -0.30) and testosterone (r range: -0.22 to -0.36) concentrations associated with higher fatigue. Subsequent quartile comparisons suggested a concentration-dependent threshold with respect to evening testosterone. Specifically, those individuals within the lowest quartile (≤68.4pg/mL) endorsed the highest fatigue of the four groups (p=0.01), while the remaining three groups did not differ from each other. This study not only showed that anabolic hormone profiles have distinctive age trajectories, but are also valuable predictors of stress and fatigue in elite military men. This highlights the importance of routine monitoring of anabolic hormone profiles to sustain and optimize health and readiness in chronically stressed populations.

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Tagged With: Age, Anabolic, DHEA, Endocrine, Military, Performance, testosterone

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Recent Publications

  • Kimonis, E. R., et al. (2018). Dehydroepiandrosterone (DHEA) and its ratio to cortisol moderate associations between maltreatment and psychopathology in male juvenile offenders. Psychoneuroendocrinology.
  • Gatzke-Kopp, L. M., et al. (2018). Magnitude and Chronicity of Environmental Smoke Exposure Across Infancy and Early Childhood in a Sample of Low-Income Children. Nicotine Tob Res.
  • Pisanic, N., et al. (2018). Minimally Invasive Saliva Testing to Monitor Norovirus Infection in Community Settings. J Infect Dis.
  • Affifi, T. D., et al. (2018). Testing the theory of resilience and relational load (TRRL) in families with type I diabetes. Health Commun.
  • Wheelock, M.D., et al. (2018). Psychosocial stress reactivity is associated with decreased whole brain network efficiency and increased amygdala centrality. Behav Neurosci.
  • Kornienko, O., et al. (2018). Associations Between Secretory Immunoglobulin A and Social Network Structure. Int J Behav Med.
  • Kuhlman, K. R., et al. (2018). Interparental conflict and child HPA-axis responses to acute stress: Insights using intensive repeated measures. J Fam Psychol.
  • Kuhlman, K. R., et al. (2018). HPA-Axis Activation as a Key Moderator of Childhood Trauma Exposure and Adolescent Mental Health. Journal of abnormal child psychology.
  • Corey-Bloom, J., et al. (2018). Salivary levels of total huntingtin are elevated in Huntington’s disease patients. Sci Rep.
  • Martinez, A. D., et al. (2018). Household fear of deportation in Mexican-origin families: Relation to body mass index percentiles and salivary uric acid. Am J Hum Biol.
  • Lucas, T., et al. (2018). Justice for all? Beliefs about justice for self and others and telomere length in African Americans. Cultur Divers Ethnic Minor Psychol.
  • Woerner, J., et al. (2018). Salivary uric acid: Associations with resting and reactive blood pressure response to social evaluative stress in healthy African Americans. Psychoneuroendocrinology.
  • Riis J.L., et al. (2018). The validity, stability, and utility of measuring uric acid in saliva. Biomark Med.

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Social Ecology I
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