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Hypothalamic pituitary adrenal axis functioning in reactive and proactive aggression in children.

Nestor L Lopez-Duran1, Sheryl L Olson, Nastassia J Hajal

  • 1Western Psychiatric Institute and Clinic, University of Pittsburgh, 3811 O'Hara Street, Pittsburgh, PA 15213, USA. NLOPEZD@pitt.edu

Journal of Abnormal Child Psychology
|August 13, 2008
PubMed
Summary

Children with reactive aggression show higher hypothalamic-pituitary-adrenal axis (HPA-axis) reactivity to stress. Proactive aggression in children is not linked to HPA-axis stress responses.

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Area of Science:

  • Child Psychology
  • Neuroendocrinology
  • Aggression Research

Background:

  • The hypothalamic-pituitary-adrenal (HPA) axis regulates stress response.
  • Aggression in children manifests as reactive or proactive types.
  • Understanding the link between HPA axis activity and aggression is crucial for developmental research.

Purpose of the Study:

  • To investigate the association between HPA axis reactivity and both proactive and reactive aggression in pre-pubertal children.
  • To determine if HPA axis response patterns differ based on aggression type.

Main Methods:

  • Seventy-three 7-year-old children underwent stress-inducing tasks (fear or frustration) or a control condition.
  • Seventeen saliva samples were collected for cortisol analysis, with 12 post-stress samples at 5-minute intervals.
  • Teacher-completed checklists assessed reactive and proactive aggression levels.

Main Results:

  • Reactive aggression significantly predicted total and peak post-stress cortisol levels.
  • Proactive aggression did not predict any measured cortisol index.
  • Children exhibiting reactive aggression demonstrated higher cortisol reactivity compared to proactive or non-aggressive children.

Conclusions:

  • An overactive HPA axis response to stress is associated with reactive aggression in children.
  • Stress-induced HPA axis variability does not appear to be related to proactive aggression.