- ICH GCP
- Registre américain des essais cliniques
- Essai clinique NCT07650903
Mental Fatigue Effects on Posture and Spinal Reflexes
Effects of Mental Fatigue on Posture and Spinal Reflexes Modulations
This randomized crossover study investigates the effects of mental fatigue on postural control and spinal reflex excitability in healthy physically active adults aged 18-35 years. Participants will complete two experimental conditions: a mentally fatiguing Stroop task and a control condition involving passive documentary watching, separated by at least 48 hours. Postural control will be assessed using force plate measures of center of pressure displacement during bipedal and unipedal stance, with and without concurrent cognitive dual-tasking. In parallel, spinal reflex excitability will be evaluated using H-reflex recordings from the triceps surae muscles across sitting and standing postures.
The primary aim is to determine whether mental fatigue increases postural sway, particularly in more challenging balance conditions such as single-leg stance. The secondary aim is to examine whether mental fatigue alters the normal modulation of spinal reflex excitability across progressively demanding postural tasks. Additional biomechanical and neuromuscular measures, including EMG activity and hip kinematics, will be recorded to provide insight into underlying control mechanisms.
The study will include approximately 26 participants, with each serving as their own control. Data will contribute to understanding how cognitive fatigue influences balance control and spinal-level neuromuscular regulation.
Aperçu de l'étude
Statut
Les conditions
Intervention / Traitement
Type d'étude
Inscription (Estimé)
Phase
- N'est pas applicable
Contacts et emplacements
Coordonnées de l'étude
- Nom: Sidney Grosprêtre, PhD
- Numéro de téléphone: +32 (0)2 629 22 22
- E-mail: sidney.grospretre@univ-fcomte.fr
Lieux d'étude
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Pleinlaan 2
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Brussels, Pleinlaan 2, Belgique, 1050
- Vrije Universiteit Brussel
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Contact:
- Sidney Grosprêtre, PhD
- Numéro de téléphone: +32 (0)2 629 22 22
- E-mail: sidney.grospretre@univ-fcomte.fr
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Critères de participation
Critère d'éligibilité
Âges éligibles pour étudier
- Adulte
Accepte les volontaires sains
La description
Inclusion Criteria:
- Healthy participants aged between 18 and 35 years
- Recreational active
Exclusion Criteria:
- Previous major lower limb injury (last 6 months)
- Present neurological or musculoskeletal disorders
- Involvement in another concurrent physical or cognitive intervention study
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
- Objectif principal: Science basique
- Répartition: Randomisé
- Modèle interventionnel: Affectation croisée
- Masquage: Seul
Armes et Interventions
Groupe de participants / Bras |
Intervention / Traitement |
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Expérimental: Control Condition
Participants watch a 60-minute neutral documentary of their choice.
This condition is designed to control for time, visual input, and arousal without inducing mental fatigue.
Postural control and spinal reflex excitability are assessed immediately before and after the task.
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Participants watch a 60-minute neutral documentary of their choice.
This condition is designed to match the mental fatigue intervention in duration and general sensory engagement without inducing cognitive fatigue.
No cognitive task performance is required.
Subjective mental fatigue is assessed at equivalent time points using a visual analogue scale.
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Expérimental: Mental Fatigue Condition
Participants complete a 60-minute computerized Stroop task designed to induce mental fatigue.
The task involves continuous performance of color-word interference trials adjusted to individual capacity.
Postural control and spinal reflex excitability are assessed immediately before and after the task.
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Participants complete a 60-minute computerized Stroop color-word task designed to induce mental fatigue.
The task consists of repeated incongruent stimuli requiring rapid and accurate responses, with difficulty individualized based on a prior maximal Stroop performance test.
Performance (reaction time and accuracy) is continuously recorded.
Subjective mental fatigue is assessed intermittently during the task using a visual analogue scale.
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Que mesure l'étude ?
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Center of Pressure (CoP) Displacement (Postural Sway)
Délai: Pre-intervention and immediately post-intervention (each experimental session)
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Postural sway will be assessed using center of pressure (CoP) displacement area and oscillation parameters measured during bipedal and unipedal stance on a force plate.
Higher values indicate greater postural instability.
Comparisons will be made between mental fatigue and control conditions, pre- and post-intervention.
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Pre-intervention and immediately post-intervention (each experimental session)
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Subjective Mental Fatigue
Délai: During intervention (every 15 minutes) and immediately post-intervention
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Subjective mental fatigue will be assessed using a visual analog scale (VAS) ranging from 0 (no fatigue) to 100 (extreme fatigue).
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During intervention (every 15 minutes) and immediately post-intervention
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Mesures de résultats secondaires
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Spinal Reflex Excitability (H-reflex Modulation)
Délai: Pre-intervention and immediately post-intervention across sitting, bipedal stance, and unipedal stance conditions
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Spinal reflex excitability will be assessed using H-reflex amplitude (H50 and Hmax), normalized to maximal M-wave (Mmax), recorded from the triceps surae muscles (soleus, medial gastrocnemius, lateral gastrocnemius) during sitting, bipedal stance, and unipedal stance.
Changes will be compared between mental fatigue and control conditions.
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Pre-intervention and immediately post-intervention across sitting, bipedal stance, and unipedal stance conditions
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Surface Electromyography (EMG) Activity of Postural Muscles
Délai: Continuous recording during postural tasks, pre-intervention and immediately post-intervention (each condition)
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Muscle activation will be assessed using root mean square (RMS) electromyography (EMG) activity recorded from the soleus, medial gastrocnemius, lateral gastrocnemius, tibialis anterior, vastus medialis, and multifidus muscles, normalized to maximal M-wave (MMAX).
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Continuous recording during postural tasks, pre-intervention and immediately post-intervention (each condition)
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Hip / Leg Movement (IMU Angular Velocity)
Délai: Pre-intervention and immediately post-intervention during bipedal and unipedal stance
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Hip and leg movements will be assessed using inertial measurement unit (IMU) sensors placed at the proximal femoral epicondyle.
Outcome is the resultant angular velocity across movement axes during postural tasks.
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Pre-intervention and immediately post-intervention during bipedal and unipedal stance
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Collaborateurs et enquêteurs
Parrainer
Les enquêteurs
- Directeur d'études: Bart Roelands, Professor, Vrije Universiteit Brussel
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude (Estimé)
Achèvement primaire (Estimé)
Achèvement de l'étude (Estimé)
Dates d'inscription aux études
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première publication (Réel)
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Réel)
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Plus d'information
Termes liés à cette étude
Mots clés
Termes MeSH pertinents supplémentaires
Autres numéros d'identification d'étude
- MFspinal
Plan pour les données individuelles des participants (IPD)
Prévoyez-vous de partager les données individuelles des participants (DPI) ?
Description du régime IPD
Informations sur les médicaments et les dispositifs, documents d'étude
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