Garner, Richard S, Rayhan, Rakib U, Baraniuk, James N · American journal of translational research · 2018
Researchers found that about one-fourth of Gulf War Illness patients developed an unusual heart rate response after exercise: their heart raced when they stood up, even though this didn't happen before exercise. This temporary condition, called the START phenotype, appeared around 2 hours after exercise and was different from a similar condition called POTS that some patients had continuously. This discovery suggests that exercise can trigger a specific cardiovascular problem in some Gulf War Illness patients.
This study identifies a novel exercise-induced cardiovascular abnormality in a subset of Gulf War Illness patients, potentially explaining post-exertional symptoms in this population. Understanding this START phenotype may provide insights into post-exertional malaise mechanisms relevant to ME/CFS and help identify patients who need modified exercise protocols.
This study does not establish the cause of the START phenotype or whether it represents a primary cardiac dysfunction versus autonomic dysregulation. The observational design cannot prove that the START phenotype directly causes patient symptoms or functional decline, and findings in Gulf War Illness may not directly apply to ME/CFS without further research. The study also does not characterize the long-term clinical consequences of developing this response.
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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