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Subgrouping Patients With Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS): Linking the Powerhouses of Cells to the Autonomic Nervous System (MITAP)

4 novembre 2026 mis à jour par: Jente Van Campenhout, Vrije Universiteit Brussel

Mitochondrial Dysfunction in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS): Are Autonomic Phenotypes Necessary to Clear Conflicting Results?

The goal of this study is to investigate whether mitochondrial dysfunction is present in patients with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) by subgrouping them into autonomic phenotypes. The main questions it aims to answer are:

  • When patients with ME/CFS are exposed to situations stressing the mitochondria and autonomic nervous system, is the response of their mitochondria and autonomic nervous system dependent on to which autonomic profile the patients belong?
  • Is the presence of mitochondrial dysfunction dependent on to which autonomic profile a patient with ME/CFS belongs? Researchers will compare healthy control subjects because very little is known about the link between mitochondria and the autonomic nervous system. It is therefore important that this is also investigated in healthy control subjects to gain a better understanding of which biological changes are normal and which changes may be involved in the symptoms of patients with ME/CFS.

Participants will:

  • Undergo an exercise test (to stress the mitochondria) and an orthostatic test (to stress the autonomic nervous system)
  • Fill in questionnaires
  • Undergo blood collection

Aperçu de l'étude

Statut

Actif, ne recrute pas

Les conditions

Intervention / Traitement

Description détaillée

ME/CFS is a debilitating disease with unknown pathophysiology. Mitochondrial dysfunction has been proposed as a potential pathophysiological mechanism because the mitochondria are important for energy metabolism. Moreover, patients with mitochondrial diseases experience similar symptoms as patients with ME/CFS, including fatigue, pain and autonomic symptoms. However, literature reports conflicting results regarding mitochondrial dysfunction in patients with ME/CFS. As ME/CFS patients present with a broad range of symptoms, subgrouping them might provide new insights.

Next to mitochondrial dysfunction, the involvement of the autonomic nervous system (ANS) has been proposed as it can be linked to common symptoms such as autonomic symptoms, post-exertional malaise (PEM) and cognitive impairments. Recently, ME/CFS patients were subgrouped into autonomic phenotypes. The presence of autonomic symptoms in patients with mitochondrial diseases highlights that there is a link between the mitochondria and ANS. Although the nature of this link remains unclear, a recent animal study showed that activation of adrenergic receptors - the binding sites of catecholamines (i.e. messengers of the ANS) - increased the production of reactive oxidative species, which are in turn known to influence autonomic function, damage the mitochondria, and regulate mitochondrial DNA methyltransferase (DNMT) expression. Mitochondrial DNMTs are responsible for mtDNA methylation (mtDNAm), which directly affects mitochondrial gene expression and could thus have a major impact on mitochondrial function. Interestingly, Buyn et al. reported that heart rate variability, an important marker to subgroup patients with ME/CFS into autonomic phenotypes, was associated with mtDNAm in a study investigating air pollution in 48 healthy males.

This raises the question whether mitochondrial dysfunction in patients with ME/CFS depends on to which autonomic phenotype they belong and whether this relation can be explained by mtDNAm, which is influenced by reactive oxygen species production upon adrenergic receptor activation. Consequently, this relation may lead to autonomic phenotype-dependent mitochondrial dysfunction. Hence, this project entails a cross-over study designed to clear the conflicting results regarding mitochondrial dysfunction in patients with ME/CFS by subgrouping them into autonomic phenotypes.

The investigators will perform an experimental cross-over study, in which the autonomic phenotypes will be validated and linked to additional biological information (i.e., mitochondrial (dys)function and mitochondrial DNA methylation). Study participants will visit the hospital twice with two weeks in between the visits. During each visit, autonomic, clinical and biological outcomes will be assessed before and after the experimental procedure, which include a single bout of submaximal exercise (Aerobic Power Index) to create a high-energy demand situation and stress the mitochondria, and an orthostatic test (Active Standing test) to stress the autonomic nervous system (ANS). The order of these experimental procedures is defined by randomly dividing all participants into two groups. Additionally, this project will assess the presence and severity of post-exertional malaise (PEM) 24h and 7 days after the experimental procedure via online assessments allowing the investigators to determine whether autonomic phenotype and mitochondrial function can predict PEM severity.

Type d'étude

Interventionnel

Inscription (Estimé)

105

Phase

  • N'est pas applicable

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Lieux d'étude

      • Jette, Belgique, 1090
        • Universitair Ziekenhuis Brussel - Vrije Universiteit Brussel

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

18 ans à 70 ans (Adulte, Adulte plus âgé)

Accepte les volontaires sains

Oui

Sexes éligibles pour l'étude

Tout

La description

Inclusion Criteria:

  • Between the ages of 18 and 70
  • Speak Dutch
  • ME/CFS syndrome (confirmed by a medical diagnosis)
  • Healthy individuals wishing to participate must be currently pain-free and healthy (i.e., participants must not be ill during the period of study participation)

Exclusion Criteria:

  • Pregnant women or women who were pregnant in the past year
  • Persons with a chronic illness such as a rheumatological, endocrine, neurological or psychiatric condition
  • Persons with a history of cancer or heart disease
  • Persons taking medications that affect the autonomic nervous system such as beta blockers

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Science basique
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation croisée
  • Masquage: Double

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Expérimental: Healthy controls

Study participants will visit the hospital twice with two weeks in between the visits. During each visit, autonomic, clinical and biological outcomes will be assessed before and after the experimental procedure, which include a single bout of submaximal exercise (Aerobic Power Index) to create a high-energy demand situation and stress the mitochondria, and an orthostatic test (Active Standing test) to stress the autonomic nervous system (ANS). The order of these experimental procedures is defined by randomly dividing all participants into two groups. Additionally, this project will assess the presence and severity of post-exertional malaise (PEM) 24h and 7 days after the experimental procedure via online assessments allowing us to determine whether autonomic phenotype and mitochondrial function can predict PEM severity.

The Aerobic Power Index (API) will be used to create a high-energy demand situation and stress the mitochondria. Briefly, cycling starts at a constant rate of 70 cycles/min and workload of 25 Watt/min, increasing 25 Watt/min until the patient reaches 75% of the age-predicted maximal heart rate.

Autres noms:
  • Indice de puissance aérobie

The ANS will be stressed via an Active Standing (AS) test, an ecological valid orthostatic test. Subjects will start in a supine position followed by standing up within five seconds, these instructions will be explained to the subjects prior to the start of the AS test. After standing up, the subjects need to maintain an upright posture quietly for seven minutes, afterwards the patients will be returned to the supine position.

Autres noms:
  • orthostatic test
Expérimental: ME/CFS patients

Study participants will visit the hospital twice with two weeks in between the visits. During each visit, autonomic, clinical and biological outcomes will be assessed before and after the experimental procedure, which include a single bout of submaximal exercise (Aerobic Power Index) to create a high-energy demand situation and stress the mitochondria, and an orthostatic test (Active Standing test) to stress the autonomic nervous system (ANS). The order of these experimental procedures is defined by randomly dividing all participants into two groups. Additionally, this project will assess the presence and severity of post-exertional malaise (PEM) 24h and 7 days after the experimental procedure via online assessments allowing us to determine whether autonomic phenotype and mitochondrial function can predict PEM severity.

The Aerobic Power Index (API) will be used to create a high-energy demand situation and stress the mitochondria. Briefly, cycling starts at a constant rate of 70 cycles/min and workload of 25 Watt/min, increasing 25 Watt/min until the patient reaches 75% of the age-predicted maximal heart rate.

Autres noms:
  • Indice de puissance aérobie

The ANS will be stressed via an Active Standing (AS) test, an ecological valid orthostatic test. Subjects will start in a supine position followed by standing up within five seconds, these instructions will be explained to the subjects prior to the start of the AS test. After standing up, the subjects need to maintain an upright posture quietly for seven minutes, afterwards the patients will be returned to the supine position.

Autres noms:
  • orthostatic test

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Mitochondrial function will be investigated in patients with ME/CFS compaired to healthy controls at baseline and after a physical exercise test.
Délai: Blood collection immediatly before procedure and after

The primary objective is to examine the difference in mitochondrial function between 75 ME/CFS patients and 30 healthy controls. Mitochondrial function will be determined in isolated peripheral blood mononuclear cells (PBMCs). Following the manufacturer's instructions, the Seahorse XF Cell Mito Stress Test Kit (Agilent) will be used to determine the oxygen consumption rate (OCR).

Blood collection immediatly before procedure and after
Autonomic nervous system (ANS) function will be explored in patients with ME/CFS and healthy controls at baseline and after an orthostatic test.
Délai: During intervention (approximately 45 mins) in hospital

The investigators will explore autonomc nervous system (ANS) function, enabling clinical stratification of 75 patients with ME/CFS. During the othostatic test or active standing test, the ANS will be monitored with the SOMNOTouch NIBP device, providing a non-invasive continuous blood pressure monitoring.

During intervention (approximately 45 mins) in hospital
Autonomic nervous system (ANS) function will be explored in patients with ME/CFS and healthy controls at baseline and after an orthostatic test.
Délai: During intervention (approximately 45 mins) in hospital

The investigators will explore autonomc nervous system (ANS) function, enabling clinical stratification of 75 patients with ME/CFS. During the othostatic test or active standing test, the ANS will be monitored with the SOMNOTouch NIBP device, providing a non-invasive continuous heart rate monitoring.

During intervention (approximately 45 mins) in hospital
Autonomic nervous system (ANS) function will be explored in patients with ME/CFS and healthy controls at baseline and after an orthostatic test.
Délai: During intervention (approximately 45 mins) in hospital

The investigators will explore autonomc nervous system (ANS) function, enabling clinical stratification of 75 patients with ME/CFS. During the othostatic test or active standing test, the ANS will be monitored with the SOMNOTouch NIBP device, providing a non-invasive continuous arterial stiffness measurement.

During intervention (approximately 45 mins) in hospital

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Prediction of severity of post-exertional malaise in patients with ME/CFS.
Délai: 24hours after both study visits

Prediction of the severity of early- (24h) post-exertional malaise (PEM) in 75 patients with ME/CFS via online assessments including the Chronic Fatigue Syndrome Symptom List.

24hours after both study visits
Prediction of severity of post-exertional malaise in patients with ME/CFS.
Délai: 7 days after both study visits

Prediction of the severity of late-onset (7 days) PEM in 75 patients with ME/CFS via online assessments including the Quality of Life Scale (quality of life, health and other areas of life, min score = not at all, max score=absolutely), Fatigue Severity Scale (min score 0=strongly disagree, max score 6=strongly agree), International Physical Activity Questionnaire and Chronic Fatigue Syndrome Symptom List.

7 days after both study visits

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Réel)

21 octobre 2024

Achèvement primaire (Estimé)

30 novembre 2026

Achèvement de l'étude (Estimé)

1 mai 2027

Dates d'inscription aux études

Première soumission

18 juillet 2024

Première soumission répondant aux critères de contrôle qualité

4 novembre 2026

Première publication (Réel)

9 novembre 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

9 novembre 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

4 novembre 2026

Dernière vérification

1 novembre 2026

Plus d'information

Termes liés à cette étude

Autres numéros d'identification d'étude

  • EC-2023-391

Plan pour les données individuelles des participants (IPD)

Prévoyez-vous de partager les données individuelles des participants (DPI) ?

NON

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .