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Annals of Behavioral Medicine

, Volume 31, Issue 3, pp 254–260 | Cite as

The relation of free plasma tryptophan to anger, hostility, and aggression in a nonpatient sample of adult men and women

  • Edward Suarez
  • K. Ranga R. Krishnan
Article

Abstract

Background: Dysregulation of central nervous system serotonergic (5-HT) activity is implicated in behavioral states and psychological traits associated with depression and aggression, with some studies suggesting possible gender-related differences.Purpose: This study examined the relation of free plasma tryptophan (TRP) to aggression and depression in a sample of 138 nonsmoking adults recruited from the general community. It was hypothesized that TRP would be associated with anger, hostility, and aggression.Methods: To minimize effects of diurnal variation and menstrual cycle, fasting blood samples were collected in the morning, and, for women, during the follicular phase of the menstrual cycle. Participants were administered questionnaires following blood draw. Plasma TRP was determined by high performance liquid chromatography.Results: In women, but not men, higher levels of TRP were associated with trait hostility, propensity for anger, a tendency to express anger outwardly, and an antagonistic interpersonal style. For men and women, greater severity of depressive symptoms, anger, and the verbal expression of anger were associated with higher TRP. These associations were independent of age, body mass index, fasting albumin, and race and ethnicity.Conclusions: These data suggest that in women, but not men, higher plasma levels of TRP, the precursor to 5-HT, are associated with anger-hostility-aggression and that these associations are independent of various potential confounds. Implications of these observations to studies employing acute TRP depletion studies are discussed.

Keywords

Beck Depression Inventory Behavioral Medicine Anger Expression Acute Tryptophan Depletion Tryptophan Depletion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Society of Behavioral Medicine 2006

Authors and Affiliations

  1. 1.Department of Psychiatry and Behavioral SciencesDuke University Medical CenterUSA

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