Using a dry electrode EEG device during balance tasks in healthy young-adult males: Test–retest reliability analysis

Abstract

Background: The analysis of brain activity during balance is an important topic in different fields of science. Given that all measurements involve an error that is caused by different agents, like the instrument, the researcher, or the natural human variability, a test–retest reliability evaluation of the electroencephalographic assessment is a needed starting point. However, there is a lack of information about the reliability of electroencephalographic measurements, especially in a new wireless device with dry electrodes.

Objective: The current study aims to analyze the reliability of electroencephalographic measurements from a wireless device using dry electrodes during two different balance tests.

Method: Seventeen healthy male volunteers performed two different static balance tasks on a Biodex Balance Platform: (a) with two feet on the platform and (b) with one foot on the platform. Electroencephalographic data was recorded using Enobio (Neuroelectrics). The mean power spectrum of the alpha band of the central and frontal channels was calculated. Relative and absolute indices of reliability were also calculated.

Results: In general terms, the intraclass correlation coefficient (ICC) values of all the assessed channels can be classified as excellent (>0.90). The percentage standard error of measurement oscillated from 0.54% to 1.02% and the percentage smallest real difference ranged from 1.50% to 2.82%.

Conclusion: Electroencephalographic assessment through an Enobio device during balance tasks has an excellent reliability. However, its utility was not demonstrated because responsiveness was not assessed.

• Balance
• EEG
• motor control
• power spectrum
• reliability

Acknowledgments

In the framework of the Spanish National R + D + i Plan, the current study has been co-funded by the Spanish Ministry of Economy and Competitiveness (ref. DEP2012-39828). This study has been also co-funded by the Government of Extremadura and European Union Regional Development Funds (FEDER), a way of making Europe (ref. GR10127). Daniel Collado-Mateo was supported by a Predoctoral Fellowship from the Fundación Tatiana Pérez de Guzmán el Bueno.

Declaration of interest

The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.