Nagelkirk, Paul R, Cook, Dane B, Peckerman, Arnold et al. · Military medicine · 2003
This study tested whether Gulf War veterans with ME/CFS had reduced exercise capacity compared to healthy Gulf War veterans. Researchers measured how well the heart and lungs worked during maximum exercise on a stationary bike. Surprisingly, the two groups performed similarly—those with ME/CFS were able to exercise just as hard and achieve similar fitness levels as the healthy veterans.
This study challenges the assumption that all ME/CFS patients have reduced aerobic capacity, suggesting that exercise intolerance in ME/CFS may involve mechanisms beyond simple cardiopulmonary limitation. Understanding whether exercise impairment is metabolic, neurological, or related to post-exertional malaise rather than maximal capacity is important for developing appropriate treatment and activity recommendations.
This study does not establish that ME/CFS involves no physiological abnormalities—it only shows that maximal aerobic capacity measured at one time point is similar to controls. It cannot determine whether patients experience post-exertional malaise or delayed symptom worsening after exercise. The findings may not generalize to all ME/CFS populations, as they are specific to Gulf War veterans.
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
Nagelkirk, Paul R, Cook, Dane B, Peckerman, Arnold, Kesil, William, Sakowski, Tracy, Natelson, Benjamin H, et al. (2003). Aerobic capacity of Gulf War veterans with chronic fatigue syndrome.. Military medicine. https://pubmed.ncbi.nlm.nih.gov/14529252/
BibTeX
@article{mecfsatlas-nagelkirk-2003-aerobic-capacity,
author = {Nagelkirk, Paul R and Cook, Dane B and Peckerman, Arnold and Kesil, William and Sakowski, Tracy and Natelson, Benjamin H and LaManca, John J},
title = {Aerobic capacity of Gulf War veterans with chronic fatigue syndrome.},
journal = {Military medicine},
year = {2003},
note = {PubMed: 14529252},
url = {https://www.mecfsatlas.com/evidence/nagelkirk-2003-aerobic-capacity},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/nagelkirk-2003-aerobic-capacity
Contribute
Private, reviewed by a human. Not a public comment thread.