Computer-assisted detection of nocturnal leg motor activity in patients with restless legs syndrome and periodic leg movements during sleep

Raffaele Ferri, Marco Zucconi, Mauro Manconi, Oliviero Bruni, Silvia Miano, Giuseppe Plazzi, Luigi Ferini-Strambi

Research output: Contribution to journalArticle

Abstract

Study Objectives: To assess the performance of a new method for automatic detection of periodic leg movements during sleep. Methods: Leg movements during sleep were visually detected in the tibialis anterior muscles recordings of 15 patients with restless legs syndrome and 15 normal controls. Leg movements were detected automatically by means of a new computer method with which electromyogram signals are first digitally band-pass filtered and then rectified; subsequently, the detection of leg movements is performed by using 2 thresholds: one for the starting point and another to detect the end point of each leg movement. Sensitivity and false-positive rate were obtained; the American Sleep Disorders Association parameters were also computed, and the results analyzed by means of the Kendall W coefficient, the linear correlation coefficient and the Bland-Altman plots. Setting: N/A. Participants: Fifteen patients with restless legs syndrome and periodic leg movements and 15 controls. Measurements and Results: High values of the Kendall W coefficient of concordance between automatic and visual analysis were found with values close to 1 and the linear correlation coefficient for leg movements index and total leg movements index was >0.950 (p5 after automatic analysis. Conclusions: Our method can be applied to the clinical evaluation of periodic leg movements during sleep, with some caution in patients with a low periodic leg movement indexes. Large-scale research application is possible and can be considered as reliable.

Original languageEnglish
Pages (from-to)998-1004
Number of pages7
JournalSleep
Volume28
Issue number8
Publication statusPublished - Aug 1 2005

Keywords

  • Computer-assisted detection
  • Periodic leg movements
  • Restless legs syndrome
  • Sleep scoring
  • Visual detection

ASJC Scopus subject areas

  • Physiology

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