• Military medicine · Nov 2023

    Observational Study

    Pre-task Intrinsic Cortical Activity in Novice and Experienced Military Specialists: A Cross-sectional Study.

    • R B Silva, Pedro Ribeiro, Siqueira Grace Silva, and Cx Lilian Martins.
    • Military Operations Support Division, Brazilian Army Research Institute of Physical Training, João Luiz Alves Street (without number), Rio de Janeiro 22291090, Brazil.
    • Mil Med. 2023 Nov 3; 188 (11-12): e3514e3521e3514-e3521.

    IntroductionNeuroscience studies brain dynamics through the analysis of electrical signals. Cortical activity estimated by electroencephalography brings accurate information about perceptions of human behavior. The examination of resting states in relation to subsequent behaviors indicates that intrinsic cortical activity (ICA) has implications for decision-making processes, especially when inserted in the context of military activities and associated with stress. The objective of this study was to compare the absolute alpha power (AAP) in the ICA in the pre-task moment of novice specialized military (NG) with experienced (ExpG), associating with the level of stress.Materials And MethodsThis was a cross-sectional, observational study with 19 military personnel (32.1 years old), divided into NG (10) and ExpG (9). The ICA was the outcome variable, with the level of stress and the time of specialization in military tasks as the exposure variables. ICA analysis were carried out based on the cortical areas to compare the ICA of the NG with that of the ExpG. The association of stress level with ICA was estimated by linear regression via linear models.ResultsThere was a significant difference in almost all cortical areas, and the averages were always higher in Exp. The high stress level was associated with greater AAP both for the NG and for the ExpG, and at the medium level, the AAP was obtained, varying according to each cortical area.ConclusionThe AAP in ExpG was significantly higher than that in NG, indicating a lower level of cortical activity and greater efficiency in sensory, motor, and visual tasks.© The Association of Military Surgeons of the United States 2023. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

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