title: Changes in the theta band coherence during motor task after hand immobilization.
abstract: Many different factors can temporarily or permanently impair movement and impairs cortical organization, e.g. hand immobilization. Such changes have been widely studied using electroencephalography. Within this context, we have investigated the immobilization effects through the theta band coherence analysis, in order to find out whether the immobilization period causes any changes in the inter and intra-hemispheric coherence within the cerebral cortex, as well as to observe whether the theta band provides any information about the neural mechanisms involved during the motor act. We analyzed the cortical changes that occurred after 48 hours of hand immobilization. The theta band coherence was study through electroencephalography in 30 healthy subjects, divided into two groups (control and experimental). Within both groups, the subjects executed a task involving flexion and extension of the index finger, before and after 48 hours. The experimental group, however, was actually submitted to hand immobilization. We were able to observe an increase in the coupling within the experimental group in the frontal, parietal and temporal regions, and a decrease in the motor area. In order to execute manual tasks after some time of movement restriction, greater coherence is present in areas related to attention, movement preparation and sensorimotor integration processes. These results may contribute to a detailed assessment of involved neurophysiological mechanism in motor act execution.
authors.affiliation: Brain Mapping and Sensory Motor Integration, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ), Rio de Janeiro, Brazil.
authors.forename: Igor
authors.initials: I
authors.lastname: Brauns
authors.affiliation: Brain Mapping and Sensory Motor Integration, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ), Rio de Janeiro, Brazil ; Unidad de Trastornos del Movimiento y Sueño (TMS), Hospital General Dr. Manuel Gea González/IFC-UNAM, Mexico City, Mexico ; Unidad de Trastornos del Movimiento y Sueño (TMS), Hospital General Ajusco Medio, Secretaria de Salud Mexico City, Mexico.
authors.forename: Silmar
authors.initials: S
authors.lastname: Teixeira
authors.affiliation: Brain Mapping and Sensory Motor Integration, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ), Rio de Janeiro, Brazil ; Institute of Applied Neuroscience (INA), Rio de Janeiro, Brazil ; National Institute of Traumatology and Orthopaedics (INTO), Neuromuscular Research Laboratory, Rio de Janeiro, Brazil.
authors.forename: Bruna
authors.initials: B
authors.lastname: Velasques
authors.affiliation: Brain Mapping and Sensory Motor Integration, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ), Rio de Janeiro, Brazil.
authors.forename: Juliana
authors.initials: J
authors.lastname: Bittencourt
authors.affiliation: Institute of Psychiatry of Federal University of Rio de Janeiro, Panic and Respiration, Rio de Janeiro, Brazil ; National Institute for Translational Medicine (INCT-TM), Rio de Janeiro, Brazil ; Physical Activity Neuroscience, Physical Activity Sciences Postgraduate Program, Salgado de Oliveira University, Niterói, Brazil.
authors.forename: Sergio
authors.initials: S
authors.lastname: Machado
authors.affiliation: Biomedical Engineering Program, COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Mauricio
authors.initials: M
authors.lastname: Cagy
authors.affiliation: Brain Mapping and Sensory Motor Integration, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ), Rio de Janeiro, Brazil.
authors.forename: Mariana
authors.initials: M
authors.lastname: Gongora
authors.affiliation: Brain Mapping and Functionality Laboratory, Federal University of Piauí, UFPI, Parnaiba, Brazil ; Brain Mapping and Plasticity Laboratory, Federal University of Piauí, UFPI, Parnaiba, Brazil.
authors.forename: Victor Hugo
authors.initials: VH
authors.lastname: Bastos
authors.affiliation: Brain Mapping and Functionality Laboratory, Federal University of Piauí, UFPI, Parnaiba, Brazil ; Brain Mapping and Plasticity Laboratory, Federal University of Piauí, UFPI, Parnaiba, Brazil.
authors.forename: Dionis
authors.initials: D
authors.lastname: Machado
authors.affiliation: Instituto de Investigación Científica, Universidad Juárez del Estado de Durango, Durango, Durango, México.
authors.forename: Ada
authors.initials: A
authors.lastname: Sandoval-Carrillo
authors.affiliation: Instituto de Investigación Científica, Universidad Juárez del Estado de Durango, Durango, Durango, México.
authors.forename: Jose
authors.initials: J
authors.lastname: Salas-Pacheco
authors.affiliation: Brain Mapping and Sensory Motor Integration, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ), Rio de Janeiro, Brazil.
authors.forename: Roberto
authors.initials: R
authors.lastname: Piedade
authors.affiliation: Brain Mapping and Sensory Motor Integration, Institute of Psychiatry of Federal University of Rio de Janeiro (IPUB/UFRJ), Rio de Janeiro, Brazil ; School of Physical Education, Bioscience Department (EEFD/UFRJ), Rio de Janeiro, Brazil ; Institute of Applied Neuroscience (INA), Rio de Janeiro, Brazil.
authors.forename: Pedro
authors.initials: P
authors.lastname: Ribeiro
authors.affiliation: Unidad de Trastornos del Movimiento y Sueño (TMS), Hospital General Dr. Manuel Gea González/IFC-UNAM, Mexico City, Mexico ; Unidad de Trastornos del Movimiento y Sueño (TMS), Hospital General Ajusco Medio, Secretaria de Salud Mexico City, Mexico.
authors.forename: Oscar
authors.initials: O
authors.lastname: Arias-Carrión
keywords: Hand immobilization; Sensorimotor integration; Theta band; qEEG coherence
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