title: 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.
  
  
  METHODS
  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%.
  
  
  CONCLUSIONS
  Electroencephalographic assessment through an Enobio device during balance tasks has an excellent reliability. However, its utility was not demonstrated because responsiveness was not assessed.
authors.affiliation: a University of Extremadura , Cáceres , Spain .|b San Pedro de Alcántara Hospital, Clinical Neurophysiology, Avda. Universidad s/n , Cáceres , Spain , and.
authors.forename: Daniel
authors.initials: D
authors.lastname: Collado-Mateo
authors.affiliation: a University of Extremadura , Cáceres , Spain .
authors.forename: Jose C
authors.initials: JC
authors.lastname: Adsuar
authors.affiliation: c Facultad de Educación , Universidad Autonoma de Chile , Talca , Chile.
authors.forename: Pedro R
authors.initials: PR
authors.lastname: Olivares
authors.affiliation: b San Pedro de Alcántara Hospital, Clinical Neurophysiology, Avda. Universidad s/n , Cáceres , Spain , and.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Cano-Plasencia
authors.affiliation: a University of Extremadura , Cáceres , Spain .
authors.forename: Narcis
authors.initials: N
authors.lastname: Gusi
mesh_terms: D000328:Adult; D000513:Alpha Rhythm / Q000502:physiology*; D002540:Cerebral Cortex / Q000502:physiology*; D004566:Electrodes; D004569:Electroencephalography; D064368:Healthy Volunteers; D006801:Humans; D008297:Male; D004856:Postural Balance / Q000502:physiology*; D015203:Reproducibility of Results; D013057:Spectrum Analysis; D059015:Wireless Technology; D055815:Young Adult
keywords: Balance; EEG; motor control; power spectrum; reliability