Reorganised motor control strategies of trunk muscles due to acute low back pain

Hirata, R. P., Salomoni, S. E., Christensen, S. W. and Graven-Nielsen, T. (2015) Reorganised motor control strategies of trunk muscles due to acute low back pain. Human Movement Science, 41 282-294. doi:10.1016/j.humov.2015.04.001

Author Hirata, R. P.
Salomoni, S. E.
Christensen, S. W.
Graven-Nielsen, T.
Title Reorganised motor control strategies of trunk muscles due to acute low back pain
Journal name Human Movement Science   Check publisher's open access policy
ISSN 1872-7646
Publication date 2015-06-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.humov.2015.04.001
Open Access Status DOI
Volume 41
Start page 282
End page 294
Total pages 13
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Formatted abstract
This study assessed how the low back motor control strategies were affected by experimental pain. In twelve volunteers the right m. longissimus was injected by hypertonic and isotonic (control) saline. The pain intensity was assessed on a visual analog scale (VAS). Subjects were seated on a custom-designed chair including a 3-dimensional force sensor adjusted to the segmental height of T1. Electromyography (EMG) was recorded bilaterally from longissimus, multifidus, rectus abdominis, and external oblique muscles. Isometric trunk extensions were performed before, during, and after the saline injections at 5%, 10%, and 20% of maximum voluntary contraction force. Visual feedback of the extension force was provided whereas the tangential force components were recorded. Compared with isotonic saline, VAS scores were higher following hypertonic saline injections (P < .01). Experimental low back pain reduced the EMG activity bilaterally of the rectus abdominis muscles during contractions at 10% and 20% MVC (P < .01) although force accuracy and tangential force variability was not affected. Increased variability in the tangential force composition was found during pain compared with the non-painful condition (P < .05). The immediate adaptation to pain was sufficient to maintain the quality of the task performance; however the long-term consequence of such adaptation is unknown and may overload other structures.
Keyword EMG
Experimental muscle pain
Isometric force
Three-dimensional force variability
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Health and Rehabilitation Sciences Publications
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