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Trunk muscle reactions to sudden unexpected and expected perturbations in the absence of upright postural demand.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Laboratory for Biomechanics and Motor Control. Örebro universitet.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Laboratory for Biomechanics and Motor Control.
2009 (English)In: Experimental Brain Research, ISSN 0014-4819, E-ISSN 1432-1106, Vol. 196, no 3, 385-92 p.Article in journal (Refereed) Published
Abstract [en]

The aim was to increase the understanding of the multifunctional role of the trunk muscles in spine control, particularly transversus abdominis (TrA). In 11 healthy males, intramuscular fine-wire electromyography (EMG) was obtained bilaterally from TrA, obliquus externus (OE), rectus abdominis (RA) and erector spinae (ES). The subjects lay on their right side on a horizontal swivel-table with immobilized pelvis and lower limbs and the trunk strapped to a movable platform. Unexpected or expected release of loads attached to the table by steel cables produced a perturbation inducing either trunk flexion or extension. The timing and the amplitude of activation of TrA were independent of direction of induced trunk movement. Furthermore, timing of TrA activation was simultaneous to or later than that of the more superficial abdominal muscles. Expectation of the perturbation caused a general shortening of onset latencies. The results indicate a direction independent function of TrA in lumbar spine control. Balancing the trunk vertically appears to add specific demands, since the recruitment of TrA in relation to the other abdominal muscles differed from earlier experiments in standing.

Place, publisher, year, edition, pages
2009. Vol. 196, no 3, 385-92 p.
National Category
Medical and Health Sciences
Research subject
Medicine/Technology
Identifiers
URN: urn:nbn:se:gih:diva-3759DOI: 10.1007/s00221-009-1860-zPubMedID: 19488742OAI: oai:DiVA.org:gih-3759DiVA: diva2:793419
Available from: 2015-03-06 Created: 2015-03-06 Last updated: 2017-12-04Bibliographically approved
In thesis
1. On the role of transversus abdominis in trunk motor control
Open this publication in new window or tab >>On the role of transversus abdominis in trunk motor control
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

All trunk muscles are important contributors to spine stability. However, the deepest abdominal muscle, transversus abdominis (TrA), with its characteristically horizontal fibre orientation seems to serve a unique function in trunk motor control. The main mechanical role of TrA is believed to be to contribute to vertebral alignment during imposed moments on the trunk, executed mainly via either regulating the pressure level within the abdominal cavity and/or transmit forces to the spine via the thoracolumbar fascia. However, the complete function of TrA and what factors affect its activation are still not fully understood. The purpose of the present thesis was to investigate the role of TrA in trunk motor control, specifically in relation to the presence or absence of postural demand on the trunk.

The timing and magnitude of TrA activation were investigated, in relation to other trunk muscles, with intramuscular fine-wire electrodes in different loading situations and body positions with varying postural demand.

In a side-lying position, with no postural demand of keeping the trunk upright, the activation of TrA was delayed relative the superficial abdominal muscles compared to previous experiments performed in a standing position. The timing and magnitude of activation of TrA did not depend upon the direction of perturbation. In the standing position, different static arm positions revealed that the activation of TrA co-varied with variations in the degree of postural demand on the trunk and also the imposed moments, regardless of moment direction. Finally, a study on rapid arm flexion movements confirmed that TrA is part of the pre-programmed anticipatory response in advance of known perturbations. The activation magnitude of TrA was the same regardless if the arm movement induced flexion or extension  moments on the trunk.

In conclusion, the activation of TrA is associated with the upright postural demand on the trunk and with balancing imposed moments acting on the spine, regardless their direction. The findings are in support of the beliefs that TrA act as a general, direction non specific, stabilizer of the lumbar spine.

Place, publisher, year, edition, pages
Örebro: Örebro universitet, 2011
Series
Örebro Studies in Medicine, ISSN 1652-4063 ; 54
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:gih:diva-3757 (URN)978-91-7668-796-3 (ISBN)
Public defence
2011-05-20, Wilandersalen, Universitetssjukhuset, Örebro, 09:00 (English)
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Supervisors
Note

Avhandlingen i fulltext finns hos Örebro universitet, se länk.

Available from: 2015-03-06 Created: 2015-03-05 Last updated: 2015-03-06Bibliographically approved

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