Plain-English translation of NCT07491315 on ClinicalTrials.gov ↗ · Source last updated · Translation generated · How we translate trials
This study doesn't follow the usual testing phases — it may be an observational study or a different type of research.
Researchers want to understand a hallmark feature of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS): a significant worsening of symptoms after even small amounts of physical activity. This study will compare symptom changes after an exercise test in two groups—people diagnosed with ME/CFS and people with heart disease—to see if this symptom flare-up pattern is truly unique to chronic fatigue syndrome. The research team will also measure oxygen use in muscles during and after exercise using a special infrared imaging technique.
People with ME/CFS often experience severe symptom flare-ups after exercise, but it's unclear whether this is unique to their condition or also happens in other illnesses like heart disease. Understanding what sets chronic fatigue syndrome apart could help doctors diagnose it more accurately and understand what's happening in the body.
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You will complete a standardized exercise test as part of your regular medical care, either in a cardiology clinic or as part of this study. Before, during, and after the exercise test, researchers will measure your muscle oxygen levels using a non-invasive infrared imaging device. You will also complete online questionnaires about your symptoms before the exercise test and again afterward to track any changes. The study compares how your symptoms respond to exercise compared to the other group.
AI-generated summary from trial data · Jul 7, 2026 · Not medical advice
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