Gamma absolute power reveals activation of motor areas after hand immobilization

OBJECTIVE: To analyze changes in gamma band absolute power in motor 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 48 hours of immobilization of the dominant hand, while performing a motor task triggered by a visual stimulus. A two-way repeated measures ANOVA with two within-group factors (moment x condition), each one with two levels (before vs. after visual stimuli; before vs. after 48-hour HI, respectively) was used to test for changes in beta band absolute power. RESULTS: Statistical analysis revealed that hand immobilization caused changes in cortical areas. A significant increase in gamma band absolute power was found after hand immobilization at electrodes F3 (p = 0.001) at F4 (p = 0.001) and at Fz (p = 0.001), at C3 (p = 0.001), C4 (p = 0.001) and Cz (p = 0.001). CONCLUSION: These results reveal that oscillations of the gamma band can be a cortical strategy to solve the effect of less activation due to movement restriction. Knowledge of the functioning of motor cortical areas after a condition of immobilization can lead to more effective strategies in rehabilitation.

Bibliographic Details

Main Authors:	Machado,Dionis, França,Jadna Helena dos Santos, Teixeira,Silmar, Bastos,Victor Hugo do Vale, Santos,Rayele Pricila Moreira dos, Cagy,Maurício, Machado,Sergio, Velasques,Bruna, Ribeiro,Pedro
Format:	Digital revista
Language:	English
Published:	Mavera Edições Técnicas e Científicas Ltda 2016
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2358-04292016000500004
Tags:	Add Tag No Tags, Be the first to tag this record!