Individual fascicles of the paraspinal muscles are activated by discrete cortical networks in humans

Tsao, Henry, Danneels, Lieven and Hodges, Paul W. (2011) Individual fascicles of the paraspinal muscles are activated by discrete cortical networks in humans. Clinical Neurophysiology, 122 8: 1580-1587. doi:10.1016/j.clinph.2011.01.048


Author Tsao, Henry
Danneels, Lieven
Hodges, Paul W.
Title Individual fascicles of the paraspinal muscles are activated by discrete cortical networks in humans
Journal name Clinical Neurophysiology   Check publisher's open access policy
ISSN 1388-2457
1872-8952
0301-150X
Publication date 2011-08-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.clinph.2011.01.048
Open Access Status Not yet assessed
Volume 122
Issue 8
Start page 1580
End page 1587
Total pages 8
Place of publication Brookvale Plaza, E. Park, Shannon, Co. Clare, Ireland
Publisher Elsevier Ireland
Language eng
Abstract Objective: To investigate whether functional specificity in different fascicles of the paraspinal muscles is associated with discrete organisation within the motor cortex.
Formatted abstract
Objective: To investigate whether functional specificity in different fascicles of the paraspinal muscles is associated with discrete organisation within the motor cortex.

Methods: In 11 healthy volunteers, electromyographic (EMG) activity was recorded bilaterally using fine-wire intramuscular electrodes from the short and deep fibres of multifidus (DM) at L4, and the longer and more superficial fibres of longissimus erector spinae (LES) at L4 and L1. Surface electrodes were also placed over the right LES at L4 and L1. Organisation at the motor cortex associated with motor excitation was investigated using transcranial magnetic stimulation (TMS).

Results: The results showed that motor cortical representation for DM was located posteriorly to that for LES. TMS maps from surface recordings of LES showed two optimal sites, which were located in proximity to the sites for DM and LES from intramuscular recordings.

Conclusion: Different fascicles of the paraspinal muscles are organised and thus could be controlled by discrete neuronal networks within the motor cortex. Further, TMS mapping from surface recordings of paraspinal muscles may be confounded by cross-talk from multiple underlying fascicles.

Significance: Discrete organisation at the motor cortex appears consistent with differential activation of different fascicles of the paraspinal muscles with function.

Highlights: ► Discrete organisation at the motor cortex is present for different fascicles of the paraspinal muscles. ► This was only observed using selective intramuscular recordings of myoelectric activity. ► Discrete organisation of different fascicles of the paraspinal muscles is consistent with its differential control during functional tasks.
Keyword Motor cortex
Discrete organisation
Paraspinal muscles
Motor control
Transcranial magnetic stimulation
Low-back-pain
Erector spinae muscles
Primary motor cortex
Lumbar multifidus
Abdominal-muscles
Evoked potentials
Hand
Representation
Threshold
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Health and Rehabilitation Sciences Publications
 
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