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Dynamic ensemble prediction of cognitive performance in spaceflight. Sci Rep 2022; 12:11032. [PMID: 35773291 PMCID: PMC9246897 DOI: 10.1038/s41598-022-14456-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Accepted: 06/07/2022] [Indexed: 11/08/2022] Open
Abstract
During spaceflight, astronauts face a unique set of stressors, including microgravity, isolation, and confinement, as well as environmental and operational hazards. These factors can negatively impact sleep, alertness, and neurobehavioral performance, all of which are critical to mission success. In this paper, we predict neurobehavioral performance over the course of a 6-month mission aboard the International Space Station (ISS), using ISS environmental data as well as self-reported and cognitive data collected longitudinally from 24 astronauts. Neurobehavioral performance was repeatedly assessed via a 3-min Psychomotor Vigilance Test (PVT-B) that is highly sensitive to the effects of sleep deprivation. To relate PVT-B performance to time-varying and discordantly-measured environmental, operational, and psychological covariates, we propose an ensemble prediction model comprising of linear mixed effects, random forest, and functional concurrent models. An extensive cross-validation procedure reveals that this ensemble outperforms any one of its components alone. We also identify the most important predictors of PVT-B performance, which include an individual's previous PVT-B performance, reported fatigue and stress, and temperature and radiation dose. This method is broadly applicable to settings where the main goal is accurate, individualized prediction of human behavior involving a mixture of person-level traits and irregularly measured time series.
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Quiquempoix M, Sauvet F, Erblang M, Van Beers P, Guillard M, Drogou C, Trignol A, Vergez A, Léger D, Chennaoui M, Gomez-Merino D, Rabat A. Effects of Caffeine Intake on Cognitive Performance Related to Total Sleep Deprivation and Time on Task: A Randomized Cross-Over Double-Blind Study. Nat Sci Sleep 2022; 14:457-473. [PMID: 35321359 PMCID: PMC8935086 DOI: 10.2147/nss.s342922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 12/07/2021] [Indexed: 11/23/2022] Open
Abstract
INTRODUCTION It is widely admitted that both total sleep deprivation (TSD) and extended task engagement (Time-On-Task, TOT) induce a cognitive fatigue state in healthy subjects. Even if EEG theta activity and adenosine both increase with cognitive fatigue, it remains unclear if these modifications are common mechanisms for both sustained attention and executive processes. METHODS We performed a double-blind counter-balanced (placebo (PCBO) and caffeine (CAF) - 2×2.5 mg/kg/24 h)) study on 24 healthy subjects (33.7 ± 5.9 y). Subjects participated in an experimental protocol including an habituation/training day followed by a baseline day (D0 and D1) and a total sleep deprivation (TSD) day beginning on D1 at 23:00 until D2 at 21:00. Subjects performed the psychomotor vigilance test (PVT) assessing sustained attention, followed by the executive Go-NoGo inhibition task and the 2-NBack working memory task at 09:15 on D1 and D2. RESULTS We showed differential contributions of TSD and TOT on deficits in sustained attention and both executive processes. An alleviating effect of caffeine intake is only observed on sustained attention deficits related to TSD and not at all on TOT effect. The caffeine dose slows down the triggering of sustained attention deficits related to TOT effect. DISCUSSION These results suggest that sustained attention deficits induced by TSD rely on the adenosinergic mechanism whereas TOT effect observed for both sustained attention and executive would not.
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Affiliation(s)
- Michael Quiquempoix
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France
| | - Fabien Sauvet
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France
| | - Mégane Erblang
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France.,LBEPS, Univ Evry, IRBA, University of Paris-Saclay, Paris, France
| | - Pascal Van Beers
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France
| | - Mathias Guillard
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France
| | - Catherine Drogou
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France
| | - Aurélie Trignol
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France
| | - Anita Vergez
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France
| | - Damien Léger
- VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France.,Centre du sommeil et de la vigilance, Hôpital Hôtel Dieu AP-HP, Paris, 75004, France
| | - Mounir Chennaoui
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France
| | - Danielle Gomez-Merino
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France
| | - Arnaud Rabat
- Department of Operational Environments, Fatigue and Vigilance Team, French Armed Forces Biomedical Research Institute (IRBA), Paris, France.,VIFASOM Team (EA 7330), University of Paris - Hôtel Dieu AP-HP Hospital, Paris, France
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