Volume 7 Supplement 1

International Society on Brain and Behaviour: 3rd International Congress on Brain and Behaviour

Open Access

Ethnicity, steroid hormones, and pain perception

  • Beth Mechlin1, 2 and
  • Susan Girdler2
Annals of General Psychiatry20087(Suppl 1):S260

https://doi.org/10.1186/1744-859X-7-S1-S260

Published: 17 April 2008

Background

The purpose of this study was to examine the relationship of steroid hormones to pain sensitivity in African Americans (AAs) and non-Hispanic Whites (nHWs).

Materials and methods

Ninety-one medically healthy men (24 AAs, 21 nHWs) and women in the late follicular phase of their menstrual cycles (26 AAs, 20 nHWs) were tested for voluntary threshold and tolerance to ischemic (IS), thermal heat (TH), and cold pressor (CP) pain. Blood was sampled after a rest period for serum testosterone and progesterone (females).

Results

In nHW men testosterone was directly related to IS threshold and TH tolerance (rs = +.61 and +.56, ps <.05). In nHW women testosterone was inversely related to IS threshold (r = −.45, p <.05). In nHW women progesterone was also inversely associated with IS tolerance and TH threshold and tolerance (rs = −.44 to −.56, ps <.05), and IS threshold (r = −.41, p <.06). There were no relationships between pain sensitivity and testosterone or progesterone in AAs.

Conclusions

This is the first study in humans to document a relationship between testosterone and pain sensitivity, which may be mediated by neuroactive metabolites of testosterone [1]. The relationship between progesterone and pain sensitivity in nHW women may explain findings on menstrual cycle and pain sensitivity [2, 3], and also fits with our previous report that increased allopregnanalone, a neuroactive metabolite of progesterone, is associated with increased pain sensitivity [4]. The results suggest ethnic and gender differences in putative steroid hormone regulation of pain perception.

Authors’ Affiliations

(1)
Department of Psychology, University of North Carolina at Chapel Hill
(2)
Department of Psychiatry, University of North Carolina at Chapel Hill

References

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  4. Mechlin B, Morrow AL, Maixner W, Girdler SS: The Relationship of Allopregnanolone Immunoreactivity and HPA-Axis Measures to Experimental Pain Sensitivity: Evidence for Ethnic Differences. Pain. 2007, 131: 142-152. 10.1016/j.pain.2006.12.027.PubMed CentralView ArticlePubMedGoogle Scholar

Copyright

© Mechlin and Girdler; licensee BioMed Central Ltd. 2008

This article is published under license to BioMed Central Ltd.

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