title: Task and intensity alters the RMS proportionality ratio in the triceps surae.
abstract: BACKGROUND
  Dynamic movements require synergistic involvement of numerous muscles, whereby different muscular and task demands could alter the ratio of this synergistic activation.
  
  
  METHODS
  Participants completed isometric, isotonic, isokinetic, and squat jump (SJ) tasks. Mean RMS EMG was collected from the medial and lateral gastrocnemius (MG, LG) and soleus (SOL), then pooled, and each muscle's activation was expressed as a percentage of the pooled activation.
  
  
  RESULTS
  The MG contributed 9-14% more to total muscle activation in isometric and isotonic tasks versus the SJ task. The SOL contributed 8% more to the SJ task compared with the isometric and isotonic tasks. Across all tasks, MG activation was 4.0% greater than SOL and 10.5% greater than LG. SOL activation was 6.5% greater in all tasks compared with LG.
  
  
  CONCLUSIONS
  Task and intensity influences the ratio of activation in the triceps surae.
authors.affiliation: University of Canberra, Discipline of Sport and Exercise Science, Bruce, Canberra, ACT, Atblralia.
authors.forename: Nick
authors.initials: N
authors.lastname: Ball
authors.affiliation: University of Portsmouth, Department of Sport and Exercise Science, Portsmouth, Hampshire, United Kingdom.
authors.forename: Joanna Clare
authors.initials: JC
authors.lastname: Scurr
mesh_terms: D000328:Adult; D004576:Electromyography; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D015203:Reproducibility of Results; D055815:Young Adult
keywords: electromyography; gastrocnemius; neuromuscular ratio; soleus; synergists; triceps surae