Week beginning 27th July 2026
Part 2 of 2 parts
Research
ME/CFS research
Skeletal muscle properties in long COVID and ME/CFS differ from those induced by bed rest — Charlton et al
"Long-term (60 days) bed rest induced severe muscle atrophy, which was not observed in patients" "Instead, both patient groups displayed a lower proportion of type I fibers, whereas only patients with ME/CFS exhibited lower capillary-to-fiber ratios and type I specific atrophy." "the lower oxidative phosphorylation capacity in both patient groups did not correlate with 2, in contrast to bed rest participants, suggesting that physiological impairments distinct from inactivity drive reduced exercise capacity in patients."
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ME/CFS and Long COVID Demonstrate Similar Bioenergetic Impairment and Recovery Failure on Two-Day Cardiopulmonary Exercise Testing — Davenport et al
"In both males and females, VO2 and workload were significantly different between patients and non-disabled controls, and with larger effect sizes at [Ventilatory Anaerobic Threshold] than at maximal exertion."
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Central origin of fatigability in Myalgic encephalomyelitis/chronic fatigue syndrome revealed by multimodal neuroimaging — Bedard et al
"Our most novel results relate to the lack of neuromuscular adaptation in ME/CFS compared to the [Healthy Volunteers]." "ME/CFS did not change their muscular and brain activity as measured via DI, EEG, BOLD, and CMC, and as a result, they demonstrated fatigue earlier than HV"
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Guidance on Home-Based Care for People with Severe ME/CFS: A Transdisciplinary Expert Statement — Hermisson et al
"The guide is based on a compilation of practice-oriented measures that have proven effective from the perspective of patients and family caregivers." "These were professionally categorized and further developed by experts in nursing science, physical therapy, general medicine and public health." "Palliative care specialists from various professional fields have expertise that can support people with severe ME/CFS."
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Circulating extracellular vesicles-microRNAs as potential biomarkers for the identification of ME/CFS: differentiating fatigue-related conditions — Eguchi et al
"Circulating EVs from ME/CFS (n = 6), ICF (n = 6), and depression (n = 8) patients were analyzed using flow cytometry, nano-tracking analysis, and comprehensive miRNA analysis."
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Sex- and menopause-related differences in immune and gastrointestinal symptom architecture in ME/CFS: evidence from factor analysis and structural equation modeling — Habermann-Horstmeier and Horstmeier
"Women demonstrate two partially separable but related symptom domains, whereas men show a more integrated immunegastrointestinal architecture." "menopausal status appears to selectively modulate immune-related symptom expression while leaving gastrointestinal symptom patterns comparatively stable."
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Long Covid research
Longitudinal immune profiling of Long COVID phenotypes reveals a shared persistent IL-17F-centered immune signature — Kumar-Singh et al
"Importantly, the persistence of these highly coordinated immune alterations occurred in parallel with the normalization of conventional acute-phase inflammatory markers." "This divergence indicates a fundamental pathophysiological transition: chronic symptom persistence in fatigue-like LC is likely driven by a self-sustaining, maladaptive tissue-repair program rather than an unresolved acute inflammatory state."
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Beneficial Effect of COVID-19 Vaccination on Decreased Pulmonary Vascular and Airway Volumes of Patients with Long-COVID Syndrome — Samaha et al
"findings indicate that patients with long COVID exhibit persistent reductions in pulmonary blood and airway volumes despite normal conventional imaging and pulmonary function tests, suggesting the presence of subtle microvascular and small-airway abnormalities"
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Persistent cytolytic CD8+ T cells recognize SARS-CoV-2 and herpesvirus epitopes in long COVID — Ma et al
"Our findings support the hypothesis that LC entails a prolonged cytolytic CD8+ T cell response against SARS-CoV-2 and resident herpesviruses."
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Associations Between Pre-Quarantine Exercise and Persistent Symptoms After SARS-CoV-2 Infection — Schmidt et al
"In our study, neither [Physical Activity] intensity nor duration showed an association with the presence or absence of long-term symptoms."
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Baroreflex sensitivity impairment in Long-COVID patients: a diagnostic tool for classifying the autonomic dysfunction spectrum — Sáinz-Jiménez et al
"We identified a significant decrease in the BRS function in patients with Long-COVID, which was more pronounced during the orthostatic position and was accompanied by a higher heart rate and lower heart rate variability."
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Wearable Heart Rate Variability Monitoring, Autonomic Dysfunction and Post-exertional Malaise in Long COVID: An Observational Study — Ruijgt et al
"Our findings provide further evidence of physiological alterations during and after physical exercise in patients with long COVID that are distinct from healthy controls." "Autonomic dysfunction and impaired recovery in HRV in patients with long COVID contribute to our understanding of abnormal exercise responses in long COVID, and likely also patients with […] ME/ CFS)"
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Integrated care pathway in individuals with Long COVID: STIMULATE-ICP, a cluster-randomized, phase 3 trial
"we report an overall decrease in reported fatigue with specialist LC care. Additional diagnostic information from multi-organ MRI did not impact fatigue or quality of life at 12 or 24 weeks." "There was no additional improvement in fatigue with digital rehabilitation versus usual care at 12 weeks, but a small subsequent improvement in the secondary outcome of fatigue and quality of life at 24 weeks was seen, which is of uncertain clinical significance."
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Neuroretinal Alterations in Persistent COVID-19: A Two-Year OCT Follow-Up — Artiaga et al
"The results of this study suggest the presence of region-specific inner retinal changes in PC patients when compared with control subjects."
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Long COVID symptom profiles, workforce participation, and working hours among adults in England: a population-based cohort study — Gravio et al
"participants with unresolved Long COVID had 38% lower odds of being in paid work at follow-up" "These results suggest potential long-term disruptions to employment in people with Long COVID contributing to productivity losses and workforce changes."
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Long COVID affects working memory: assessment using a single rapid online test — Asghar et al
"Our results link working memory deficits to “brain fog,” a hallmark of long COVID" "Objective memory scores negatively correlated with brain fog severity, which was highest in the diagnosed group, followed by self-reported and non-long COVID groups."
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The Burden of Long-COVID-19 Among Pediatric Subjects: A Systematic Review and Meta-Analysis — Cioni et al
"52 cohort studies and 960,089 subjects were included. The pooled rate of LC was 18.1% […] ranging from 16.2% to 21.6%, according to NIH or WHO diagnostic criteria, respectively." "Fatigue, respiratory and neurological symptoms were most commonly reported by LC patients."
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Characterization and Validation of EHR Computable Phenotypes for Long COVID Using Patient-Reported Symptoms: Insights from the Nationwide RECOVER Program — Castro et al
"Despite the undercoding of Long COVID diagnoses, a computable phenotype algorithm integrating demographics, symptoms, diagnoses, medications, procedures, laboratory results, and vital signs demonstrated high discrimination and calibration."
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Immunotherapies for postural orthostatic tachycardia syndrome, other common autonomic disorders, and Long COVID: current state and future direction — Blitshteyn et al
"In this narrative review, we summarize the literature available on the topic of immunotherapies for POTS, other common autonomic disorders, and Long COVID." "We also highlight the need for large, multicenter, placebo-controlled trials of immunoglobulin, plasmapheresis, intermittent corticosteroids, and other repurposed immunotherapies in patients with common autonomic disorders who have significant functional impairment."
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The Use of a Handheld Non-Invasive Vagal Nerve Stimulation (nVNS) Device for the Treatment of Long COVID: A Pilot Randomized Controlled Trial — Ganesh et al
"neither primary or secondary outcomes reached statistical significance"
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Related research
The genetic architecture of fibromyalgia across 2.5 million individuals — Kerrebijn et al
"we identified 26 genetic risk loci for fibromyalgia, providing robust characterization of its genetic architecture. These findings establish a firm biological basis for a long-debated condition." "Despite several-fold-higher prevalence in females, we found no sex difference in the genetic architecture of fibromyalgia."
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