Differential activity of regions of the psoas major and quadratus lumborum during submaximal isometric trunk efforts

Park, Rachel J., Tsao, Henry, Cresswell, Andrew G. and Hodges, Paul W. (2012) Differential activity of regions of the psoas major and quadratus lumborum during submaximal isometric trunk efforts. Journal of Orthopaedic Research, 30 2: 311-318. doi:10.1002/jor.21499


Author Park, Rachel J.
Tsao, Henry
Cresswell, Andrew G.
Hodges, Paul W.
Title Differential activity of regions of the psoas major and quadratus lumborum during submaximal isometric trunk efforts
Journal name Journal of Orthopaedic Research   Check publisher's open access policy
ISSN 0736-0266
1554-527X
Publication date 2012-02
Year available 2011
Sub-type Article (original research)
DOI 10.1002/jor.21499
Volume 30
Issue 2
Start page 311
End page 318
Total pages 8
Place of publication Hoboken, United States
Publisher John Wiley & Sons
Collection year 2012
Language eng
Abstract Controversy exists regarding the function of psoas major (PM) and quadratus lumborum (QL) at the lumbar spine. The functions of discrete regions of PM and QL were studied during trunk loading tasks. Twelve healthy participants performed isometric trunk loading tasks in various directions in upright sitting. Fine-wire electromyography (EMG) electrodes were inserted under ultrasound guidance into PM fascicles arising from the transverse process (PM-t) and vertebral body (PM-v) and the anterior (QL-a) and posterior (QL-p) layers of QL on the right side. Although right PM-t and PM-v were both active during right lateral-flexion trunk efforts, their activity was opposite in the sagittal plane, with greater PM-t towards extension and PM-v towards flexion. QL-a and QL-p were similarly active, though QL-p was active to a greater percentage of MVC during right trunk lateral-flexion efforts. Activity of QL-p was modulated with respiratory phase during the loading tasks with trunk efforts towards the right lateral-flexion/flexion and right lateral-flexion directions. These findings provide novel understanding of the unique activation of discrete regions of PM and QL. These differences must be considered in future EMG studies to better understand the function of these deeply situated trunk muscles in the control of the lumbar spine.
Keyword Fine-wire electromyography
Lumbar spine
Postural control
Respiration
Trunk muscles
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 28 JUL 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Health and Rehabilitation Sciences Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Fri, 21 Oct 2011, 17:11:48 EST by Andrew Cresswell on behalf of School of Health & Rehabilitation Sciences