Trunk muscle geometry and centroid location when twisting

Y. H. Tsuang, G. J. Novak, O. D. Schipplein, A. Hafezi, J. H. Trafimow, G. B J Andersson

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The trunk muscles of the lumbar region were studied using magnetic resonance imaging (MRI) in five male volunteers placed in neutral and in two twisted postures. Using a CAD digitizing system, the positions of trunk muscle centroids and the cross-sectional areas of these muscles were measured from the transverse scans at 1 cm intervals from L2 to S1. Muscle lines of action were created by connecting the muscle centroids from the successive sections. Changes in cross-sectional areas and displacements of centroids in a three-dimensional coordinate system and the local two-dimensional coordinate system were estimated at each disc level. In the three-dimensional coordinate system, all muscle centroids were displaced when twisting. Thus, the locations and orientations of all muscle lines of action changed. In the local two-dimensional coordinate system, only the muscle centroids of four abdominal muscles were displaced. Most of these displacements occurred in the first 25° of twisting. Higher up in the lumbar spine, the displacement was greater. The changes in moment arms were sometimes as great as twofold. Only the abdominal oblique muscle (AOM) changed their cross-sectional area significantly; the area of the right AOM ipsilateral to the side of twisting increased, while that of the left AOM was decreased.

Original languageEnglish
Pages (from-to)537-546
Number of pages10
JournalJournal of Biomechanics
Volume26
Issue number4-5
DOIs
Publication statusPublished - 1993
Externally publishedYes

Fingerprint

Muscle
Muscles
Geometry
Abdominal Muscles
Lumbosacral Region
Posture
Volunteers
Spine
Magnetic Resonance Imaging
Magnetic resonance
Computer aided design
Imaging techniques
Abdominal Oblique Muscles

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Tsuang, Y. H., Novak, G. J., Schipplein, O. D., Hafezi, A., Trafimow, J. H., & Andersson, G. B. J. (1993). Trunk muscle geometry and centroid location when twisting. Journal of Biomechanics, 26(4-5), 537-546. https://doi.org/10.1016/0021-9290(93)90015-7

Trunk muscle geometry and centroid location when twisting. / Tsuang, Y. H.; Novak, G. J.; Schipplein, O. D.; Hafezi, A.; Trafimow, J. H.; Andersson, G. B J.

In: Journal of Biomechanics, Vol. 26, No. 4-5, 1993, p. 537-546.

Research output: Contribution to journalArticle

Tsuang, YH, Novak, GJ, Schipplein, OD, Hafezi, A, Trafimow, JH & Andersson, GBJ 1993, 'Trunk muscle geometry and centroid location when twisting', Journal of Biomechanics, vol. 26, no. 4-5, pp. 537-546. https://doi.org/10.1016/0021-9290(93)90015-7
Tsuang YH, Novak GJ, Schipplein OD, Hafezi A, Trafimow JH, Andersson GBJ. Trunk muscle geometry and centroid location when twisting. Journal of Biomechanics. 1993;26(4-5):537-546. https://doi.org/10.1016/0021-9290(93)90015-7
Tsuang, Y. H. ; Novak, G. J. ; Schipplein, O. D. ; Hafezi, A. ; Trafimow, J. H. ; Andersson, G. B J. / Trunk muscle geometry and centroid location when twisting. In: Journal of Biomechanics. 1993 ; Vol. 26, No. 4-5. pp. 537-546.
@article{b676c930c7b74a6097634a3db7b6fd56,
title = "Trunk muscle geometry and centroid location when twisting",
abstract = "The trunk muscles of the lumbar region were studied using magnetic resonance imaging (MRI) in five male volunteers placed in neutral and in two twisted postures. Using a CAD digitizing system, the positions of trunk muscle centroids and the cross-sectional areas of these muscles were measured from the transverse scans at 1 cm intervals from L2 to S1. Muscle lines of action were created by connecting the muscle centroids from the successive sections. Changes in cross-sectional areas and displacements of centroids in a three-dimensional coordinate system and the local two-dimensional coordinate system were estimated at each disc level. In the three-dimensional coordinate system, all muscle centroids were displaced when twisting. Thus, the locations and orientations of all muscle lines of action changed. In the local two-dimensional coordinate system, only the muscle centroids of four abdominal muscles were displaced. Most of these displacements occurred in the first 25° of twisting. Higher up in the lumbar spine, the displacement was greater. The changes in moment arms were sometimes as great as twofold. Only the abdominal oblique muscle (AOM) changed their cross-sectional area significantly; the area of the right AOM ipsilateral to the side of twisting increased, while that of the left AOM was decreased.",
author = "Tsuang, {Y. H.} and Novak, {G. J.} and Schipplein, {O. D.} and A. Hafezi and Trafimow, {J. H.} and Andersson, {G. B J}",
year = "1993",
doi = "10.1016/0021-9290(93)90015-7",
language = "English",
volume = "26",
pages = "537--546",
journal = "Journal of Biomechanics",
issn = "0021-9290",
publisher = "Elsevier Limited",
number = "4-5",

}

TY - JOUR

T1 - Trunk muscle geometry and centroid location when twisting

AU - Tsuang, Y. H.

AU - Novak, G. J.

AU - Schipplein, O. D.

AU - Hafezi, A.

AU - Trafimow, J. H.

AU - Andersson, G. B J

PY - 1993

Y1 - 1993

N2 - The trunk muscles of the lumbar region were studied using magnetic resonance imaging (MRI) in five male volunteers placed in neutral and in two twisted postures. Using a CAD digitizing system, the positions of trunk muscle centroids and the cross-sectional areas of these muscles were measured from the transverse scans at 1 cm intervals from L2 to S1. Muscle lines of action were created by connecting the muscle centroids from the successive sections. Changes in cross-sectional areas and displacements of centroids in a three-dimensional coordinate system and the local two-dimensional coordinate system were estimated at each disc level. In the three-dimensional coordinate system, all muscle centroids were displaced when twisting. Thus, the locations and orientations of all muscle lines of action changed. In the local two-dimensional coordinate system, only the muscle centroids of four abdominal muscles were displaced. Most of these displacements occurred in the first 25° of twisting. Higher up in the lumbar spine, the displacement was greater. The changes in moment arms were sometimes as great as twofold. Only the abdominal oblique muscle (AOM) changed their cross-sectional area significantly; the area of the right AOM ipsilateral to the side of twisting increased, while that of the left AOM was decreased.

AB - The trunk muscles of the lumbar region were studied using magnetic resonance imaging (MRI) in five male volunteers placed in neutral and in two twisted postures. Using a CAD digitizing system, the positions of trunk muscle centroids and the cross-sectional areas of these muscles were measured from the transverse scans at 1 cm intervals from L2 to S1. Muscle lines of action were created by connecting the muscle centroids from the successive sections. Changes in cross-sectional areas and displacements of centroids in a three-dimensional coordinate system and the local two-dimensional coordinate system were estimated at each disc level. In the three-dimensional coordinate system, all muscle centroids were displaced when twisting. Thus, the locations and orientations of all muscle lines of action changed. In the local two-dimensional coordinate system, only the muscle centroids of four abdominal muscles were displaced. Most of these displacements occurred in the first 25° of twisting. Higher up in the lumbar spine, the displacement was greater. The changes in moment arms were sometimes as great as twofold. Only the abdominal oblique muscle (AOM) changed their cross-sectional area significantly; the area of the right AOM ipsilateral to the side of twisting increased, while that of the left AOM was decreased.

UR - http://www.scopus.com/inward/record.url?scp=0027577568&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027577568&partnerID=8YFLogxK

U2 - 10.1016/0021-9290(93)90015-7

DO - 10.1016/0021-9290(93)90015-7

M3 - Article

VL - 26

SP - 537

EP - 546

JO - Journal of Biomechanics

JF - Journal of Biomechanics

SN - 0021-9290

IS - 4-5

ER -