Does immobilization of dependent hand promote adaptative changes in cerebral cortex? An analysis through qEEG asymmetry

et al. 2016

Medical Express

Self Cite

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.

Section: ■ Discussionmentioning

confidence: 97%

“…In the parietal region, we chose the derivations P3, Pz and P4, and in the occipital regions, the O1, Oz and O2 derivations were also used. [32][33][34]…”

Section: Selected Derivations and Frequency Bandmentioning

confidence: 99%

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

Machado¹,

França²,

et al. 2016

Medical Express

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“…19 Derivations C3, Cz and C4, were also selected because of their relationship with the motor cortex. 20,21 The gamma band was chosen due to its relation with motor tasks and because it is the most specific EEG band to investigate movements patterns. It may reflect the efficiency of sensory-motor integration and indicates levels of coupling between cortical areas.…”

Section: Selected Derivations and Frequency Bandmentioning

confidence: 99%

Gamma absolute power reveals activation of motor areas after hand immobilization

Machado¹,

França²,

et al. 2016

Medical Express

Self Cite

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.

“…In this way, hand movements appear to be an interesting source of study due to motor and sensorial representations in the cerebral cortex [4]. Moreover, studies found changes in neural networks in primary somatosensory cortex and primary motor areas (M1) when individuals were subjected limited movements [2,5,6].…”

Section: Introductionmentioning

confidence: 99%

Hand immobilization causes changes in cortical areas: qEEG alfa band absolute power study

Machado

Bastos²,

et al. 2015

Int Arch Med

Hand immobilization has been associated with changes in neural networks of primary somatosensory cortex and primary motor areas. Electrophysiologically, alpha band absolute power may indicate how cerebral cortex processes information. This study aimed to analyze changes in alpha band absolute power on frontal, central, parietal and occipital derivations when hand-movement of subjects was restricted for 48 hours. Fifteen healthy volunteers (20 to 30 years old), were recorded using electroencephalography (qEEG), while exposition to visual stimulus linked to a motor task before and after hand immobilization. Statistical analysis revealed that hand immobilization caused changes in frontal, central and parietal areas of cerebral cortex. In summary, after hand immobilization alpha band absolute power increased in these areas, revealing a lower activation. Contrarily, at C4 there was a decreased alpha band absolute power correlated to more activation. These findings can be due adaptive plasticity to supply less activation at C3, considering the inactivity of right hand due to the immobilization. Further studies are needed to better understand the complex processes involved in this type of task.