Fulcher, K Y, White, P D · Journal of neurology, neurosurgery, and psychiatry · 2000 · DOI
This study compared muscle strength and exercise capacity in people with ME/CFS to healthy sedentary people and people with depression. Researchers found that ME/CFS patients were weaker and could not exercise as long, even though they were as physically deconditioned as the sedentary controls. After exercise therapy, patients improved—mainly by having lower heart rate responses during activity—suggesting that rebuilding physical fitness can help restore function.
This study provides objective physiological evidence that ME/CFS patients experience real, measurable muscle weakness and exercise limitation—not merely psychological fatigue. Understanding that deconditioning contributes to disability and responds to graded exercise therapy has informed treatment approaches and validates the biological basis of functional impairment in ME/CFS.
This study does not establish that deconditioning is the primary cause of ME/CFS; it shows an association in a cross-sectional snapshot. The study also does not address whether graded exercise therapy is universally safe or effective for all ME/CFS patients, nor does it measure post-exertional malaise or longer-term outcomes. Correlation between reduced heart rate and improved capacity does not prove causation of the underlying pathophysiology.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Fulcher, K Y & White, P D (2000). Strength and physiological response to exercise in patients with chronic fatigue syndrome.. Journal of neurology, neurosurgery, and psychiatry. https://doi.org/10.1136/jnnp.69.3.302
BibTeX
@article{mecfsatlas-fulcher-2000-strength-physiological,
author = {Fulcher, K Y and White, P D},
title = {Strength and physiological response to exercise in patients with chronic fatigue syndrome.},
journal = {Journal of neurology, neurosurgery, and psychiatry},
year = {2000},
doi = {10.1136/jnnp.69.3.302},
note = {PubMed: 10945803},
url = {https://www.mecfsatlas.com/evidence/fulcher-2000-strength-physiological},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/fulcher-2000-strength-physiological
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