On the role of transversus abdominis in trunk motor control

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Crommert, Martin Eriksson,1974-Gymnastik- och idrottshögskolan,Örebro universitet,Hälsoakademin,Laboratoriet för biomekanik och motorisk kontroll (BMC) (författare)

On the role of transversus abdominis in trunk motor control

BokEngelska2011

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Örebro :Örebro universitet,2011
67 s.
electronicrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:oru-15047
ISBN:9789176687963
https://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-15047URI
https://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-3757URI
https://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-2458URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:vet swepub-contenttype
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Serie

Örebro Studies in Medicine,1652-4063 ;54

Anmärkningar

Avhandlingen i fulltext finns hos Örebro universitet, se länk.
Studierna utförda vid Laboratoriet för biomekanisk kontroll BMC vid GIH.
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.

Ämnesord och genrebeteckningar

transversus abdominis
trunk muscles
EMG
intramuscular
IAP
motor control
postural control
spine stability
postural demand
MEDICINE
MEDICIN
Medicin
Medicine

Biuppslag (personer, institutioner, konferenser, titlar ...)

Engfeldt, Peter,ProfessorAllmänmedicinskt forskningscentrum, Örebro läns landsting och Hälsoakademin ÖU (preses)
Thorstensson, Alf,ProfessorGymnastik- och idrottshögskolan,Laboratoriet för biomekanik och motorisk kontroll (BMC) (preses)
Ekblom, Maria,PhDGymnastik- och idrottshögskolan,Laboratoriet för biomekanik och motorisk kontroll (BMC) (preses)
Öberg, Birgitta,ProfessorInstitutionen för medicin och hälsa, Linköpings universitet (opponent)
Örebro universitetHälsoakademin (creator_code:org_t)

Internetlänk

https://oru.diva-portal.org/smash/get/diva2:405950/FULLTEXT01.pdffulltext
https://oru.diva-portal.org/smash/get/diva2:405950/COVER01.pdfcover
https://oru.diva-portal.org/smash/get/diva2:405950/SPIKBLAD01.pdfspikblad
http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-15047Länk till avhandilngen hos Örebro universitet
https://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-15047
https://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-3757
https://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-2458

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Av författaren/redakt...: Crommert, Martin ...; Engfeldt, Peter, ...; Thorstensson, Al ...; Ekblom, Maria, P ...; Öberg, Birgitta, ...

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Av lärosätet: Örebro universitet; Gymnastik- och idrottshögskolan

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