Innervation zone location of the biceps brachii, a comparison between genders and correlation with anthropometric measurements

Jason M. DeFreitas, Pablo B. Costa, Eric D. Ryan, Trent J. Herda, Joel T. Cramer, Travis W. Beck

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Avoiding the innervation zone (IZ) is important when collecting surface electromyographic data. The purposes of this study were threefold: (1) to examine the precision of two different techniques for expressing IZ location for the biceps brachii, (2) to compare these locations between men and women, and (3) to determine if IZ movement with changes in elbow joint angle is related to different anthropometric measures. Twenty-four subjects (mean ± SD ages = 21.8 ± 3.5 yr) performed isometric contractions of the right forearm flexors at each of three separate elbow joint angles (90°, 120°, and 150° between the arm and forearm). During each contraction, the location of the IZ for the biceps brachii was visually identified using a linear electrode array. These IZ locations were expressed in both absolute (i.e. as a distance (mm) from the acromion process) and relative (i.e. as a percentage of humerus length) terms. The results suggested that the estimations of IZ location were more precise when expressed in relative versus absolute terms, and were generally different for men and women. The shift in IZ location with changes in elbow joint angle was not, owever, related to height, weight, or humerus length.

Original languageEnglish (US)
Pages (from-to)76-80
Number of pages5
JournalJournal of Electromyography and Kinesiology
Volume20
Issue number1
DOIs
StatePublished - Feb 2010

Keywords

  • EMG
  • Electrode array
  • Isometric

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Biophysics
  • Clinical Neurology

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