title: Functional connectivity between core and shoulder muscles increases during isometric endurance contractions in judo competitors.
abstract: OBJECTIVE
  The aim of this study was to assess the surface electromyogram (SEMG) changes within and between muscles of the torso and shoulder region during static endurance contraction in elite judokas. We hypothesized an increased functional connectivity of muscles from the shoulder and torso regions during sustained isometric contraction.
  
  
  METHODS
  Twelve healthy, right-handed judo competitors participated in the study. The SEMG signals from the dominant trapezius (upper, middle and lower part), deltoideus anterior, serratus anterior, and pectoralis major muscles were recorded during isometric endurance contraction consisting of bilateral arm abduction at 90°. The normalized mutual information (NMI) was computed between muscle pairs as an index indicating functional connectivity.
  
  
  RESULTS
  The NMIs increased significantly during endurance test for 10 of the 15 muscle pairs (P < 0.001).
  
  
  CONCLUSIONS
  We concluded that the increases in NMIs highlighted functional changes in the interplay between core and shoulder muscles during an endurance contraction in elite judokas.
authors: Department of Athletes Motor Skills, University School of Physical Education, al.I.J Paderewskiego 35, Wrocław, Poland.
authors: Adam
authors: A
authors: Kawczyński
authors: Afshin
authors: A
authors: Samani
authors: Dariusz
authors: D
authors: Mroczek
authors: Paweł
authors: P
authors: Chmura
authors: Wiesław
authors: W
authors: Błach
authors: Juliusz
authors: J
authors: Migasiewicz
authors: Sebastian
authors: S
authors: Klich
authors: Jan
authors: J
authors: Chmura
authors: Pascal
authors: P
authors: Madeleine
mesh_terms: D000328:Adult; D015444:Exercise; D006801:Humans; D008297:Male; D016139:Martial Arts / Q000502:physiology*; D009119:Muscle Contraction; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology*; D010807:Physical Endurance; D012782:Shoulder / Q000502:physiology*; D060726:Torso / Q000502:physiology*
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