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Proceedings: Sex Differences and Analgesics; London, UK, 11 November 2001: Research Abstract

Sex differences in cortisol response to noxious stress

Zimmer, C.*; Basler, H-D.; Vedder, H.; Lautenbacher, S.

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European Journal of Anaesthesiology: 2002 - Volume 19 - Issue - p 3-4

Background and objective

Evidence has accumulated that men and women show different responses to noxious stimuli, with women exhibiting greater sensitivity to pain than men [1]. Data concerning sex differences in cortisol response patterns have revealed inconsistent results so far. While some studies showed no differences in cortisol reaction to psychosocial stress others found marked sex differences showing higher cortisol levels in men [2,3]. The purpose of the present study was to examine sex differences in cortisol reaction to a noxious stressor.

Methods

Seventy-six subjects (39 male and 37 female) participated in a modification of cold-pressor stimulation that consisted of periodic exposure of the hand into ice water (plunge-test, PT) [4]. The whole PT consisted of two consecutive trials and at each trial tolerance time and pain ratings (VAS) were assessed. Eight saliva samples (c1-c8) were collected to determine cortisol levels at baseline (c1-c3), directly before (c4) and 20 min after noxious stress (c5), and during the recovery period (c6-c8).

Results

We found no significant sex differences in tolerance time for PT1 (F (1/74) = 3.04, P < 0.10) but highly significant differences in tolerance time for PT2 (F (1/74) = 7.59, P < 0.01), indicating higher tolerance times in men (Fig. 1). No significant sex differences were found for pain intensity and unpleasantness in the two trials. However, a significantly larger cortisol increase was observed in men compared to women (F (1/72) = 5.30, P < 0.05) (Fig. 2). MANCOVA revealed that this result could not be attributed to sex differences in tolerance time.

Figure 1
Figure 1:
Means and standard deviations in pain tolerance for plunge-test 1 (PT1) and plunge-test 2 (PT2) in women (▪) and men (JOURNAL/ejanet/04.02/00003643-200219261-00002/ENTITY_OV0071/v/2017-07-27T035916Z/r/image-png). **P < 0.01.
Figure 2
Figure 2:
Means and standard deviations of saliva cortisol during the experiment (c4: directly before the PT, c5: 20 min after the PT) in women (―●―) and men (―■―). *Interaction sex × cortisol c4 compared to c5:P < 0.05.

Conclusions

The present study demonstrates that men show a larger cortisol response to a noxious stressor than women that is not attributable to sex differences in subjective pain. Our findings corroborate results of earlier studies [1,2] showing stronger cortisol reactions in men to psychosocial stress. A causal relation between larger cortisol responses and higher pain tolerance thresholds in men is yet speculative but a putative analgesic action of cortisol could also be derived from endocrine studies in chronic pain patients.

Acknowledgements

This study was supported in part by a grant from the Deutsche Schmerzstiftung. We thank Conny Würz of the University of Marburg for conducting the salivary cortisol assays.

References

1. Berkley KJ. Sex differences in pain. Behav Brain Sci 1995; 20: 371-380.
2. Kirschbaum C, Wüst S, Hellhammer, D. Consistent sex differences in cortisol responses to psychological stress. Psychosom Med 1992; 54: 648-657.
3. Kirschbaum C, Kudielka, BM, Gaab J, Schommer N, Hellhammer DH. Impact of gender, menstrual cycle phase, and oral contraceptives on the activity of the hypothalamus-pituitary-adrenal axis. Psychosom Med 1999; 61: 154-162.
4. Worthington EL. Labor room and laboratory: clinical validation of the cold pressor as a means of testing preparation for childbirth strategies. J Psychosom Res 1982; 26: 223-230.
Keywords:

SEX DIFFERENCES; HPA-REACTION, cortisol; NOXIOUS STRESS, plunge test

© 2002 European Society of Anaesthesiology