title: Reliability of recurrence quantification analysis measures of the center of pressure during standing in individuals with musculoskeletal disorders.
abstract: Although the application of nonlinear tools including recurrence quantification analysis (RQA) has increasingly grown in the recent years especially in balance-disordered populations, there have been few studies which determine their measurement properties. Therefore, a methodological study was performed to estimate the intersession and intrasession reliability of some dynamic features provided by RQA for nonlinear analysis of center of pressure (COP) signals recorded during quiet standing in a sample of patients with musculoskeletal disorders (MSDs) including low back pain (LBP), anterior cruciate ligament (ACL) injury and functional ankle instability (FAI). The subjects completed postural measurements with three levels of difficulty (rigid surface-eyes open, rigid surface-eyes closed, and foam surface-eyes closed). Four RQA measures (% recurrence, % determinism, entropy, and trend) were extracted from the recurrence plot. Relative reliability of these measures was assessed using intraclass correlation coefficient and absolute reliability using standard error of measurement and coefficient of variation. % Determinism and entropy were the most reliable features of RQA for the both intersession and intrasession reliability measures. High level of reliability of % determinism and entropy in this preliminary investigation may show their clinical promise for discriminative and evaluative purposes of balance performance.
authors.affiliation: Musculoskeletal Research Center, School of Rehabilitation Sciences, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Masood
authors.initials: M
authors.lastname: Mazaheri
authors.forename: Hossein
authors.initials: H
authors.lastname: Negahban
authors.forename: Mahyar
authors.initials: M
authors.lastname: Salavati
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Sanjari
authors.forename: Mohamad
authors.initials: M
authors.lastname: Parnianpour
mesh_terms: D000328:Adult; D016512:Ankle Injuries / Q000503:physiopathology; D000843:Ankle Joint / Q000503:physiopathology; D016118:Anterior Cruciate Ligament / Q000503:physiopathology; D000070598:Anterior Cruciate Ligament Injuries; D001696:Biomechanical Phenomena; D019277:Entropy; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology; D007718:Knee Injuries / Q000503:physiopathology; D017116:Low Back Pain / Q000503:physiopathology; D008297:Male; D009140:Musculoskeletal Diseases / Q000503:physiopathology*; D004856:Postural Balance / Q000502:physiology*; D011312:Pressure; D015203:Reproducibility of Results; D055815:Young Adult