Cleare, A J, Sookdeo, S S, Jones, J et al. · The Journal of clinical endocrinology and metabolism · 2000 · DOI
This study investigated whether people with ME/CFS have problems with growth hormone (GH), a chemical in the body that affects energy and metabolism. Researchers compared 37 ME/CFS patients to 37 healthy controls by measuring various growth hormone-related substances in their blood and urine, and tested how their bodies responded to specific hormone challenges. They found no significant differences between the two groups, suggesting that ME/CFS is not caused by growth hormone deficiency.
Since GH deficiency shares some clinical features with ME/CFS (fatigue, muscle weakness), clarifying whether GH dysfunction contributes to ME/CFS pathophysiology is important for understanding disease mechanisms and identifying appropriate treatments. This negative finding helps rule out GH axis dysfunction as a primary cause, redirecting research toward other biological pathways.
This study does not prove that GH has no role in ME/CFS symptoms; it only shows that standard GH markers and dynamic responses are normal at group level. It does not exclude GH dysfunction in ME/CFS subgroups or at tissue-level sensitivity issues. The finding that hydrocortisone didn't affect GH parameters does not explain how it may reduce fatigue through other mechanisms.
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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