Snell, Christopher R, Vanness, J Mark, Strayer, David R et al. · In vivo (Athens, Greece) · 2002
This study looked at whether exercise test results could predict high levels of RNase L, an enzyme that may be involved in ME/CFS. Researchers asked 73 patients to exercise until they were exhausted, and found that those with elevated RNase L had lower exercise capacity than those with normal levels. The findings suggest that simple exercise tests might help doctors identify which ME/CFS patients have this particular biological abnormality.
Identifying biological subgroups within the ME/CFS population is crucial for developing targeted treatments and understanding disease heterogeneity. If exercise performance can reliably predict RNase L abnormalities, it could provide clinicians with a non-invasive screening tool to stratify patients and guide therapeutic decisions. This bridges the gap between clinical symptoms and measurable biological markers.
This study does not prove that elevated RNase L causes reduced exercise tolerance—the relationship could be reversed or both could result from a third factor. It does not establish that RNase L is the only biological abnormality in ME/CFS, nor does it prove these findings apply to all ME/CFS populations or different geographic regions. The cross-sectional design cannot determine whether RNase L elevation precedes or follows reduced physical capacity.
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
Snell, Christopher R, Vanness, J Mark, Strayer, David R, & Stevens, Staci R (2002). Physical performance and prediction of 2-5A synthetase/RNase L antiviral pathway activity in patients with chronic fatigue syndrome.. In vivo (Athens, Greece). https://pubmed.ncbi.nlm.nih.gov/12073768/
BibTeX
@article{mecfsatlas-snell-2002-physical-performance,
author = {Snell, Christopher R and Vanness, J Mark and Strayer, David R and Stevens, Staci R},
title = {Physical performance and prediction of 2-5A synthetase/RNase L antiviral pathway activity in patients with chronic fatigue syndrome.},
journal = {In vivo (Athens, Greece)},
year = {2002},
note = {PubMed: 12073768},
url = {https://www.mecfsatlas.com/evidence/snell-2002-physical-performance},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/snell-2002-physical-performance
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