| Observations on intra-abdominal pressure and patterns of abdominal intra-muscular activity in man. | |
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MedLine Citation:
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PMID: 1534959 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The aim was to investigate possible relationships between activities of the individual muscles of the ventrolateral abdominal wall and the development of pressure within the abdominal cavity. Intra-muscular activity was recorded bilaterally from transversus abdominis, obliquus internus, obliquus externus and rectus abdominis with fine-wire electrodes guided into place using real-time ultrasound. Intra-abdominal pressure was measured intragastrically using a micro tip pressure transducer. Six males were studied during loading and movement tasks with varied levels of intra-abdominal pressure. During both maximal voluntary isometric trunk flexion and extension, transversus abdominis activity and intra-abdominal pressure remained constant, while all other abdominal muscles showed a marked reduction during extension. When maximal isometric trunk flexor or extensor torques were imposed upon a maximal Valsalva manoeuvre, transversus abdominis activity and intra-abdominal pressure remained comparable within and across conditions, whereas obliquus internus, obliquus externus and rectus abdominis activities either markedly increased (flexion) or decreased (extension). Trunk twisting movements showed reciprocal patterns of activity between the left and right sides of transversus abdominis, indicating an ability for torque development. During trunk flexion--extension, transversus abdominis showed less distinguished changes of activity possibly relating to a general stabilizing function. In varied pulsed Valsalva manoeuvres, changes in peak intra-abdominal pressure were correlated with mean amplitude electromyograms of all abdominal muscles, excluding rectus abdominis. It is concluded that the co-ordinative patterns shown between the muscles of the ventrolateral abdominal wall are task specific based upon demands of movement, torque and stabilization. It appears that transversus abdominis is the abdominal muscle whose activity is most consistently related to changes in intra-abdominal pressure. |
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Authors:
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A G Cresswell; H Grundström; A Thorstensson |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Acta physiologica Scandinavica Volume: 144 ISSN: 0001-6772 ISO Abbreviation: Acta Physiol. Scand. Publication Date: 1992 Apr |
Date Detail:
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Created Date: 1992-07-13 Completed Date: 1992-07-13 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0370362 Medline TA: Acta Physiol Scand Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 409-18 Citation Subset: IM |
Affiliation:
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Department of Physiology III, Karolinska Institute, Danderyd Hospital, Stockholm, Sweden. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Abdominal Muscles
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anatomy & histology,
physiology* Adult Biomechanics Electromyography Humans Isometric Contraction / physiology Male Movement / physiology Muscle Contraction / physiology* Pressure Valsalva Maneuver / physiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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