Abstract
Psychosocial stress plays a major role in the etiology and the course of mental disorders that often show an altered activation of the hypothalamus–pituitary–adrenal (HPA) axis. The Trier Social Stress Test (TSST) reliably activates the HPA axis and reflects real life stress exposure. However, habituation may confound the results of clinical trials that apply TSST. The present study investigates the cortisol response after repeated psychosocial stress induction with short-term and long-term intervals between repeated testing sessions. Forty-one healthy subjects were exposed to the TSST four times with an interval of 24 h between the first and the second testing session (t1 and t2). The 3rd and the 4th testing session (t3 and t4) were also separated by a 24-hour interval whereas there were 10 weeks between t2 and t3. A significant decrease in the salivary cortisol responses was noticed from testing session t1 to t2 as well as from testing session t3 to t4. By contrast, there were no differences in the HPA axis reactivity between testing session t2 and t3. Our results demonstrated the habituation of the HPA axis to a standardized psychosocial stress test when testing was repeated after 24 h. By contrast, a renewed challenge with a ten-week-interval in-between activated the HPA axis in a similar manner as before. It is suggested that studies designed to investigate the HPA axis activity under repeated psychosocial stress conditions should apply the TSST three times in order to separate habituation from intervention effects.
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Acknowledgments
The authors’ sincere appreciation goes to Clemens Kirschbaum for analyzing the cortisol saliva probes and providing assistance with the TSST. The authors are most grateful to the Medical Faculty of the Technical University Dresden for supporting this study with a Young Researchers’ Grant (MedDrive).
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Petrowski, K., Wintermann, GB. & Siepmann, M. Cortisol Response to Repeated Psychosocial Stress. Appl Psychophysiol Biofeedback 37, 103–107 (2012). https://doi.org/10.1007/s10484-012-9183-4
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DOI: https://doi.org/10.1007/s10484-012-9183-4