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Learned helplessness and urinary MHPG levels in unipolar depression
J A Samson1, S M Mirin, S T Hauser
1Department of Psychiatry, Harvard Medical School, Boston, MA.
The American Journal of Psychiatry
|June 1, 1992
Summary
Depressed patients with higher urinary MHPG levels, a marker of noradrenergic activity, reported greater feelings of powerlessness. This suggests a link between biological stress markers and learned helplessness in depression.
Area of Science:
- Neuroscience
- Psychiatry
- Clinical Psychology
Background:
- Learned helplessness is linked to increased noradrenergic activity in animals exposed to uncontrollable stressors.
- Depressed patients often report heightened feelings of helplessness and powerlessness.
Purpose of the Study:
- To investigate the relationship between perceived powerlessness and central noradrenergic activity in patients diagnosed with major depressive disorder.
Main Methods:
- Twenty drug-free patients with major depressive disorder completed the Kobasa Hardiness Questionnaire, assessing powerlessness, security, and alienation.
- 24-hour urine samples were collected to measure 3-methoxy-4-hydroxyphenylglycol (MHPG) levels, an indicator of noradrenergic activity.
Main Results:
- A significant positive correlation was observed between urinary MHPG levels and total hardiness scores.
- Urinary MHPG levels also showed a significant positive correlation with total powerlessness scores.
- No significant correlations were found between MHPG levels and scores for security or alienation.
Conclusions:
- Elevated urinary MHPG levels in depressed patients are associated with increased perceptions of powerlessness.
- These findings suggest that depressed individuals with higher noradrenergic activity may exhibit cognitive features characteristic of learned helplessness.