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Study of the Effects of Acute Exposure to Moderate Altitude Hypoxia on Prospective Memory. (HYPRO)

Etude Des Effets d'Une Exposition aiguë à l'Hypoxie d'Altitude modérée Sur la mémoire Prospective (HYPRO)

The goal of this study is to investigate whether prospective memory, i.e., memory for delayed intentions, is impaired at moderate altitude (4,000m).

It will also allow to study the effect of air and oxygen administration during hypoxia exposure.

The main questions it aims to answer are:

  • Does moderate acute hypoxia impair prospective memory ?
  • If so, does air or oxygen adminsitration induce a restoration of prospective memory? Researchers will compare cognitive performance during normobaric hypoxia exposure to cognitive performance during normoxia (control situation).

Participants will:

  • Session S0. Perform a battery of neuropsychological tests and questionnaires). EEG will be recorded during tests. A cheek swab will be performed.
  • Sessions S1 and S2. Perform several cognitive tasks while exposed to hypoxia and to normoxia (2 different sessions, randomized order) in a normobaric chamber. These are standardized cognitive tests administered on a computer and cognitive tests embedded in a flight simulator scenario. Various questionnaires will be performed on a regular basis. Several physiological measurements will be performed continuously: EEG, ECG, SpO2 and breathing rate. Blood pressure will be measured at the beginning and at the end of hypoxia/normoxia exposure. A blood sample will also be performed. At last, participants will inhale air or oxygen through a mask while making a cognitive task in the chamber.

Aperçu de l'étude

Description détaillée

Flight crew operate in a dynamic, complex, and uncertain environment that requires them to process a large amount of information from multiple sources under time pressure. To successfully carry out their mission, flight crews must therefore constantly sort, prioritize, and analyze relevant information based on the situation, which requires them to manage their cognitive resources simultaneously-at the risk of experiencing a decline in performance that could significantly compromise aviation safety.

With recent changes in the geostrategic context, the flight profiles of operational missions expose military aircraft crews and onboard operators to a greater risk of in-flight hypoxia. During an acute hypoxic episode, physiological cardiac and respiratory responses are triggered to protect the body-and particularly the brain-from oxygen deprivation. However, these mechanisms are effective only for a limited time. If normoxia is not restored, symptoms will manifest as hypoxemia worsens.

Among flight crew members, impairments in cognitive functions-particularly prospective memory-such as failing to report one's position to other aircraft or failing to retract the flaps before takeoff, are common and can lead to serious accidents. To our knowledge, the effects of hypoxic exposure on this form of memory have not yet been investigated.

Type d'étude

Interventionnel

Inscription (Estimé)

50

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.

Coordonnées de l'étude

Sauvegarde des contacts de l'étude

Lieux d'étude

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

  • Adulte

Accepte les volontaires sains

Oui

La description

Inclusion Criteria:

  • Healthy volunteer
  • Has provided informed consent

Exclusion Criteria:

  • Individuals who do not understand French
  • Pregnant or breastfeeding women
  • Cardiovascular risk factor
  • Infectious disease within the last 4 weeks
  • Chronic cardiovascular, respiratory, hematological, neurological, psychiatric, or metabolic disease
  • History of epileptic seizures, convulsions, or loss of consciousness
  • Individuals with migraines
  • History of a bleeding disorder
  • History of high blood pressure
  • Current medication use (excluding contraception)
  • History of episodes of altitude intolerance
  • Stay at high altitude (> 3,500 m) within the last 3 months
  • Anxiety score on the Hospital Anxiety and Depression (HAD) scale > 7
  • Depression score on the HAD scale > 7
  • Uncontrollable claustrophobia or a history of panic attacks

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: Autre
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation croisée
  • Masquage: Double

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Expérimental: Normoxia-Air + Hypoxia-Air
S1 = Normoxia exposure + air administration S2 = Hypoxia exposure + air administration
Normobaric hypoxia exposure (FiO2 = 12,6%, equivalent to 4,000m) during 4h
Air administration (Fi02 = 21%) through a mask during 10 minutes
Auditory oddball, visual oddball, event-based prospective memory, time-based prospective memory, n-back.
EEG, ECG, SpO2, breathing rate, eyetracking, blood pressure
A blood sample is collected for mitochondrial breathing analyses
Event-based prospective memory and time-based prospective memory. Prepar3D flight simulator.
Expérimental: Hypoxia-Air + Normoxia-Air
S1 = Hypoxia exposure + air administration S2 = Normoxia exposure + air administration
Normobaric hypoxia exposure (FiO2 = 12,6%, equivalent to 4,000m) during 4h
Air administration (Fi02 = 21%) through a mask during 10 minutes
Auditory oddball, visual oddball, event-based prospective memory, time-based prospective memory, n-back.
EEG, ECG, SpO2, breathing rate, eyetracking, blood pressure
A blood sample is collected for mitochondrial breathing analyses
Event-based prospective memory and time-based prospective memory. Prepar3D flight simulator.
Expérimental: Normoxia-O2 + Hypoxia-O2
S1 = Normoxia exposure + oxygen administration S2 = Hypoxia exposure + oxygen administration
Normobaric hypoxia exposure (FiO2 = 12,6%, equivalent to 4,000m) during 4h
Auditory oddball, visual oddball, event-based prospective memory, time-based prospective memory, n-back.
EEG, ECG, SpO2, breathing rate, eyetracking, blood pressure
A blood sample is collected for mitochondrial breathing analyses
Event-based prospective memory and time-based prospective memory. Prepar3D flight simulator.
Oxygen administration (FiO2 = 100%) through a mask during 10 minutes
Expérimental: Hypoxia-O2 + Normoxia-O2
S1 = Hypoxia exposure + oxygen administration S2 = Normoxia exposure + oxygen administration
Normobaric hypoxia exposure (FiO2 = 12,6%, equivalent to 4,000m) during 4h
Auditory oddball, visual oddball, event-based prospective memory, time-based prospective memory, n-back.
EEG, ECG, SpO2, breathing rate, eyetracking, blood pressure
A blood sample is collected for mitochondrial breathing analyses
Event-based prospective memory and time-based prospective memory. Prepar3D flight simulator.
Oxygen administration (FiO2 = 100%) through a mask during 10 minutes

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Change in event-based prospective memory accuracy between hypoxia and normoxia conditions
Délai: Through study completion, an average of 1 month
Accuracy (%) = Prospective memory target detection rate (number of targets correctly responded to / total number of targets presented × 100)
Through study completion, an average of 1 month

Collaborateurs et enquêteurs

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

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 (Estimé)

6 mai 2026

Achèvement primaire (Estimé)

31 décembre 2026

Achèvement de l'étude (Estimé)

31 décembre 2026

Dates d'inscription aux études

Première soumission

30 avril 2026

Première soumission répondant aux critères de contrôle qualité

9 mai 2026

Première publication (Réel)

13 mai 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

13 mai 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

9 mai 2026

Dernière vérification

1 avril 2026

Plus d'information

Termes liés à cette étude

Plan pour les données individuelles des participants (IPD)

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

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Étudie un produit d'appareil réglementé par la FDA américaine

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