Fiedler, N, Kipen, H M · Annals of the New York Academy of Sciences · 2001 · DOI
This review looked at studies where people with chemical sensitivities were exposed to different odors and chemical mixtures in controlled lab settings. Researchers found that people with chemical sensitivities did have real symptoms when exposed to certain chemicals, even at low levels, but these symptoms weren't always linked to measurable changes in heart rate, breathing, or other body functions that usually indicate stress.
Understanding whether chemical sensitivities involve true biological changes or psychophysiologic mechanisms is crucial for ME/CFS patients, particularly Gulf War veterans with concurrent CFS. This review demonstrates that real symptom responses occur in controlled settings, validating patient experiences while also suggesting that the physiologic mechanisms may be more complex than simple sensitization.
This review does not establish whether chemical sensitivities cause or exacerbate ME/CFS, nor does it prove that symptom absence of measurable physiologic changes means symptoms are non-biological. The findings suggest mechanisms vary by sensitivity type, but do not definitively explain the underlying cause of symptoms in any group. Correlation between exposure and symptoms does not establish causation of long-term disease.
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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