Comparison between an automatic and a visual scoring method of the chin muscle tone during rapid eye movement sleep

Raffaele Ferri, Jean François Gagnon, Ronald B. Postuma, Francesco Rundo, Jacques Y. Montplaisir

Research output: Contribution to journalArticle


Objective: To compare two different methods, one visual and the other automatic, for the quantification of rapid eye movement (REM) sleep without atonia (RSWA) in the diagnosis of REM sleep behavior disorder (RBD). Methods: Seventy-four RBD patients (mean age, 62.14. ±. 9.67. years) and 75 normal controls (mean age, 61.04. ±. 12.13. years) underwent one night video-polysomnographic recording. The chin electromyogram (EMG) during REM sleep was analyzed by means of a previously published visual method quantifying the percentage of 30. s epochs scored as tonic (abnormal, ≥30%) and that of 2. s mini-epochs containing phasic EMG events (abnormal, ≥15%). For the computer quantitative analysis we used the automatic scoring algorithm known as the atonia index (abnormal,

Original languageEnglish
Pages (from-to)661-665
Number of pages5
JournalSleep Medicine
Issue number6
Publication statusPublished - 2014



  • Atonia index
  • Automatic analysis
  • Phasic chin EMG
  • REM sleep behavior disorder
  • REM sleep without atonia
  • Tonic chin EMG

ASJC Scopus subject areas

  • Medicine(all)

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