The recruitment order of scapular muscles depends on the characteristics of the postural task

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • Universidad de Talca
  • Universidad Santo Tomás
  • Queensland University of Technology QUT

Abstract

Previous studies show that the scapular muscle recruitment order could possibly change according to the characteristics of the postural task. We aimed to compare the activation latencies of serratus anterior (SA), upper, middle, and lower trapezius (UT, MT and LT, respectively) between an unpredictable perturbation (sudden arm destabilization) and a predictable task (voluntary arm raise) and, to determine the differences in the muscle recruitment order in each task. The electromyographic signals of 23 participants were recorded while the tasks were performed. All scapular muscles showed earlier onset latency in the voluntary arm raise than in the sudden arm destabilization. No significant differences were observed in the muscle recruitment order for the sudden arm destabilization (p > 0.05). Conversely, for voluntary arm raise the MT, LT SA and anterior deltoid (AD) were activated significantly earlier than the UT (p < 0.001). Scapular muscles present a specific recruitment order during a predictable task: SA was activated prior to the AD and the UT after the AD, in a recruitment order of SA, AD, UT, MT, and LT. While in an unpredictable motor task, all muscles were activated after the destabilization without a specific recruitment order, but rather a simultaneous activation.

Details

Original languageEnglish
Pages (from-to)40-47
Number of pages8
JournalJournal of Electromyography and Kinesiology
Volume31
Publication statusPublished - 1 Dec 2016

Keywords

  • Anticipatory, Compensatory, Electromyography, Motor control, Muscle latency, Reaction time