Involvement of beta absolute power in motor areas after hand immobilization: An EEG study

• Main Authors: Dionis Machado, Jadna Helena dos Santos França, Silmar Teixeira, Victor Hugo do Vale Bastos, Maurício Cagy, Alberto Souza de Sá Filho, Sérgio Machado, Bruna Velasques, Pedro Ribeiro
• Format: Article
• Language: English
• Published: Mavera, Edições Científicas e Técnicas Ltda
• Series: Medical Express
• Subjects: beta band; hand immobilization; neural plasticity; electroencephalography
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2358-04292016000500003&lng=en&tlng=en

OBJECTIVE: The purpose of this study was to analyze changes in beta band absolute power in cortical areas, before and after a condition of hand immobilization for 48 hours. METHOD: Fifteen healthy volunteers, aged between 20 and 30, were submitted to EEG assessment before and after immobilization, while performing a motor task triggered by a visual stimulus. RESULTS: Statistical analysis revealed that hand immobilization caused changes in cortical areas. Significant increases in beta band absolute power were found after hand immobilization at electrodes Fp2, C3 and P4. In contrast, at electrode C4 a decrease in beta band absolute power occurred after hand immobilization. CONCLUSION: Predominant hand immobilization, even for 48 hours, is sufficient to cause cortical changes that affect movement planning. Such changes may represent a cortical strategy to supply cortical changes in contralateral hemisphere due to immobilization. Further studies are necessary to understand cortical changes due to hand immobilization and movement planning, especially considering how much time of immobilization is necessary to promote such changes.