Abstract
Background
The etiology of chronic fatigue syndrome (CFS) remains unknown. Personality traits influence well-being and may play a role in CFS and unexplained chronic fatigue.
Purpose
This study aimed to examine the association of emotional instability and extraversion with chronic fatigue and CFS in a genetically informative sample.
Methods
We evaluated 245 twin pairs for two definitions of chronic fatigue. They completed the Neuroticism and Extraversion subscales of the NEO Five Factor Inventory. Using a co-twin control design, we examined the association between personality and chronic fatigue.
Results
Higher emotional instability was associated with both definitions of chronic fatigue and was confounded by shared genetics. Lower extraversion was also associated with both definitions of fatigue, but was not confounded by familial factors.
Conclusions
Both emotional instability and extraversion are related to chronic fatigue and CFS. Whereas emotional instability and chronic fatigue are linked by shared genetic mechanisms, the relationship with extraversion may be causal and bidirectional.
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Acknowledgments
This research was supported by National Institutes of Health awards U19AI38429 (Buchwald) and R01AR51524 (Afari). Drs. Strachan, Buchwald, and Afari are supported in part by award RC2HL103416 (Buchwald). Dr. Strachan is supported in part by R21AI81347. Dr. Afari is also supported by the VA Center of Excellence for Stress and Mental Health.
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The authors have no conflict of interest to disclose.
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Brian Poeschla and Eric Strachan contributed equally to this work.
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Poeschla, B., Strachan, E., Dansie, E. et al. Chronic Fatigue and Personality: A Twin Study of Causal Pathways and Shared Liabilities. ann. behav. med. 45, 289–298 (2013). https://doi.org/10.1007/s12160-012-9463-5
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DOI: https://doi.org/10.1007/s12160-012-9463-5