Shift work in teens linked to increased multiple sclerosis risk

Circadian disruption and sleep restriction contributing factors

2011-10-19

(Press-News.org) Researchers from Sweden have uncovered an association between shift work and increased risk of multiple sclerosis (MS). Those who engage in off-hour employment before the age of 20 may be at risk for MS due to a disruption in their circadian rhythm and sleep pattern. Findings of this novel study appear today in Annals of Neurology, a journal published by Wiley-Blackwell on behalf of the American Neurological Association and Child Neurology Society.

Previous research has determined that shift work—working during the night or rotating working hours—increases the risk of cardiovascular disease, thyroid disorders, and cancer. Circadian disruption and sleep restriction are associated with working night shifts; these factors are believed to disturb melatonin secretion and increase inflammatory responses, promoting disease states. MS is a central nervous system autoimmune inflammatory disorder that has an important environmental component, thus investigating lifestyle risk factors, such as sleep loss related to shift work, is an important objective and the focus of the current study.

Dr. Anna Karin Hedström and colleagues from the Karolinska Institutet in Stockholm analyzed data from two population-based studies—one with 1343 incident cases of MS and 2900 controls and another with 5129 prevalent MS cases and 4509 controls. The team compared the occurrence of MS among study subjects exposed to shift work at various ages against those who had never been exposed. All study subjects resided in Sweden and were between the ages of 16 and 70. Shift work was defined as permanent or alternating working hours between 9 p.m. and 7 a.m.

"Our analysis revealed a significant association between working shift at a young age and occurrence of MS," explains Dr. Hedström. "Given the association was observed in two independent studies strongly supports a true relationship between shift work and disease risk." Results showed that those in the incident MS cohort who had worked off-hour shifts for three years or longer before age 20 had a 2 fold-risk of developing MS compared with those who never worked shifts. Similarly, subjects in the prevalent cohort who engaged in shift work as teens had slightly more than a 2-fold risk of MS than subjects who never worked shifts.

The authors suggest that disruption of circadian rhythm and sleep loss may play a role in the development of MS; however the exact mechanisms behind this increased risk remain unclear and further study is needed.

### This study is published in Annals of Neurology. Media wishing to receive a PDF of this article may contact healthnews@wiley.com.

Full citation:"Shift Work at Young Age is Associated with Increased Risk for Multiple Sclerosis." Anna Karin Hedström, Torbjörn Åkerstedt, Jan Hillert, Tomas Olsson and Lars Alfredsson. Annals of Neurology; Published Online: October 18, 2011 (DOI:10.1002/ana.22597). http://doi.wiley.com/10.1002/ana.22597

Author Contact: To arrange an interview with Dr. Hedström, please contact Camilla Wernersson with the Karolinska Institutet at camilla.wernersson@ki.se.

About the Journal Annals of Neurology, the official journal of the American Neurological Association and the Child Neurology Society, publishes articles of broad interest with potential for high impact in understanding the mechanisms and treatment of diseases of the human nervous system. All areas of clinical and basic neuroscience, including new technologies, cellular and molecular neurobiology, population sciences, and studies of behavior, addiction, and psychiatric diseases are of interest to the journal.

About Wiley-Blackwell Wiley-Blackwell is the international scientific, technical, medical, and scholarly publishing business of John Wiley & Sons, with strengths in every major academic and professional field and partnerships with many of the world's leading societies. Wiley-Blackwell publishes nearly 1,500 peer-reviewed journals and 1,500+ new books annually in print and online, as well as databases, major reference works and laboratory protocols. For more information, please visit http://www.wileyblackwell.com or our new online platform, Wiley Online Library (http://www.wileyonlinelibrary.com), one of the world's most extensive multidisciplinary collections of online resources, covering life, health, social and physical sciences, and humanities.

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Shift work in teens linked to increased multiple sclerosis risk

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