title: An algorithm for detecting EMG onset/offset in trunk muscles during a reaction- stabilization test.
abstract: BACKGROUND
  Most of the EMG analysis algorithms developed to date don't detect the whole sequence of rhythmic and subtle changes that take place during the process of trunk stabilization. Indeed, the few recent methods that are capable of assessing these important EMG characteristics are highly complex and not accessible in most applied clinic contexts.
  
  
  OBJECTIVE
  To validate and disseminate a software program suitable for detecting multiple and relatively small EMG bursts during a trunk stabilization response.
  
  
  METHODS
  Ninety EMG recordings randomly selected from 50 individuals (24 with chronic low back pain) were analysed by our algorithm based on means and standard deviations and an experienced examiner (as a gold standard). Concordance, sensitivity, specificity, positive predictive value and negative predictive value were considered to analyse reliability.
  
  
  RESULTS
  Results showed a high degree of concordance between the two methods (87.2%), high sensitivity and specificity rates (79.5 and 89.2%), a moderate-low positive predicted value (66.9%) and a high negative predicted value (94.4%).
  
  
  CONCLUSIONS
  The program provided is flexible and useful to detect EMG activity. The selected parameters of the program were able to detect onset/offset EMG bursts and were valid for the purpose of this study with a small tendency to over-detect bursts.
authors.affiliation: Institut Nacional d'Activitat Física de Catalunya Barcelona, Barcelona, Spain.|Fundació Universitària del Bages, Barcelona, Spain.
authors.forename: Júlia
authors.initials: J
authors.lastname: Jubany
authors.affiliation: Institut Nacional d'Activitat Física de Catalunya Barcelona, Barcelona, Spain.|Department of Kinesiology, California State University, Northridge, CA, USA.
authors.forename: Rosa
authors.initials: R
authors.lastname: Angulo-Barroso
mesh_terms: D000328:Adult; D000465:Algorithms; D001415:Back / Q000502:physiology; D059350:Chronic Pain / Q000503:physiopathology; D004576:Electromyography / Q000379:methods*; D005260:Female; D006801:Humans; D017116:Low Back Pain / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000502:physiology* / Q000503:physiopathology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D060726:Torso / Q000502:physiology / Q000503:physiopathology
keywords: Electromyography; low back; muscle onset and offset detection; sudden load