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Methods: A total of 4779 participants from the Medical Research Council's National Survey of Health and Development were prospectively followed for the first 53 years of their life with more than 20 separate data collections. Information was collected on childhood and parental health, atopic illness [e.g., allergies, eczema, asthma], levels of physical activity, fatigue, and participant's weight and height at multiple time points. CFS was identified through self-report during a semistructured interview at age 53 years with additional case notes review.

Results: Of 2983 participants assessed at age 53 years, 34 (1.1%, 95% Confidence Interval 0.8-1.5) reported a diagnosis of CFS. Those who reported CFS were no more likely to have suffered from childhood illness or atopy. Increased levels of exercise throughout childhood and early adult life and a lower body mass index were associated with an increased risk of later CFS. Participants who later reported CFS continued to exercise more frequently even after they began to experience early symptoms of fatigue.

Conclusions: Individuals who exercise frequently are more likely to report a diagnosis of CFS in later life. This may be due to the direct effects of this behavior or associated personality factors. Continuing to be active despite increasing fatigue may be a crucial step in the development of CFS.

[Note: to read more about this study's details, implications, and limitations, see the commentary by CFIDS Association Research Director Suzanne Vernon, PhD - "Etiology, Exercise, and CFS."]

Source: Psychosomatic Medicine, Mar 31 2008. [E-pub ahead of print] PMID: 18378866. Harvey SB, Wadsworth M, Wessely S, Hotopf M. Institute of Psychiatry, King's College London, London, UK; Medical Research Council's National Survey of Health and Development (M.W.), Department of Epidemiology and Public Health, Royal Free and UCL Medical School, London, UK.