Shephard, R J · The Journal of sports medicine and physical fitness · 2005
This review examined what might cause ME/CFS and how to treat it. The authors found that many different factors have been suggested as causes—including overtraining, stress, hormonal problems, infections, and immune issues—but none consistently appears in all patients. They concluded that the best approach is to help patients gradually rebuild physical fitness through exercise, counseling, and encouragement, while avoiding the harmful cycle of doing less and becoming more deconditioned.
This review addresses a fundamental question for ME/CFS patients: what causes the condition and how should it be treated? Understanding proposed mechanisms and treatment approaches helps patients and clinicians develop informed management strategies. The emphasis on deconditioning as a reversible component offers potential for improvement through rehabilitation.
This review does not establish that any single factor definitively causes ME/CFS, as the authors acknowledge inconsistent findings across studies. It does not prove that graded exercise is effective for all ME/CFS patients—this remains a contentious recommendation, particularly for those with post-exertional malaise. The narrative review methodology cannot determine causation from correlation or account for potential publication bias.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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