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

•Experimental pain was applied in the longissimus muscle in healthy subjects while performing isometric trunk extensions.•Pain decreased the EMG activity bilaterally of the rectus abdominis muscles.•Performance of the task was not affected by pain.•Tangential forces generated by the trunk segment we...

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Bibliographic Details
Published in:Human movement science 2015-06, Vol.41, p.282-294
Main Authors: Hirata, R.P., Salomoni, S.E., Christensen, S.W., Graven-Nielsen, T.
Format: Article
Language:English
Subjects:
Adult
Back - physiology
Cross-Over Studies
Electromyography - methods
EMG
Experimental muscle pain
Female
Humans
Isometric Contraction - physiology
Isometric force
Low Back Pain - physiopathology
Male
Motor Skills
Muscle Contraction
Muscle, Skeletal - physiology
Pain Management
Pain Measurement
Rectus Abdominis - physiology
Saline Solution, Hypertonic
Single-Blind Method
Three-dimensional force variability
Young Adult
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Summary:•Experimental pain was applied in the longissimus muscle in healthy subjects while performing isometric trunk extensions.•Pain decreased the EMG activity bilaterally of the rectus abdominis muscles.•Performance of the task was not affected by pain.•Tangential forces generated by the trunk segment were altered by pain.•The motor adaptations to pain were unique for each individual. 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
ISSN:0167-9457
1872-7646
DOI:10.1016/j.humov.2015.04.001