Trunk muscle activation while resisting asymmetrically applied loads in an axially rotated posture

Steven A. Lavender, Yang Hwei Tsuang, Gunnar B J Andersson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The present investigation describes the electromyographic (EMG) response of eight trunk muscles during the application of loads to the torso while subjects maintained a twisted posture. The external moments of 20 and 40 Nm were applied to a harness system as each of the 10 subjects twisted 25 degrees. The applied moment direction was varied in 30 degree increments completely around the subjects (0 to 330 degrees). Surface EMG was used to monitor the left and right Latissimus Dorsi, Erector Spinae, External Oblique, and Rectus Abdominus. Multivariate and univariate analyses of variance (MANOVA and ANOVA) procedures showed significant main effects for all muscles and a significant moment magnitude by moment direction interaction effect in 6 of the 8 muscles. The greatest muscle activity was observed in the right Erector Spinae and the left External Oblique muscles. The results are also compared with an earlier study in which a similar loading paradigm was used as subject maintained a neutral upright posture.

Original languageEnglish
Title of host publicationProceedings of the Human Factors Society
PublisherPubl by Human Factors Soc Inc
Pages752-756
Number of pages5
Volume1
Publication statusPublished - 1992
Externally publishedYes
EventProceedings of the Human Factors Society 36th Annual Meeting. Part 2 (f 2) - Atlanta, GA, USA
Duration: Oct 12 1992Oct 16 1992

Other

OtherProceedings of the Human Factors Society 36th Annual Meeting. Part 2 (f 2)
CityAtlanta, GA, USA
Period10/12/9210/16/92

Fingerprint

Muscle
Chemical activation
Analysis of variance (ANOVA)

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Lavender, S. A., Tsuang, Y. H., & Andersson, G. B. J. (1992). Trunk muscle activation while resisting asymmetrically applied loads in an axially rotated posture. In Proceedings of the Human Factors Society (Vol. 1, pp. 752-756). Publ by Human Factors Soc Inc.

Trunk muscle activation while resisting asymmetrically applied loads in an axially rotated posture. / Lavender, Steven A.; Tsuang, Yang Hwei; Andersson, Gunnar B J.

Proceedings of the Human Factors Society. Vol. 1 Publ by Human Factors Soc Inc, 1992. p. 752-756.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lavender, SA, Tsuang, YH & Andersson, GBJ 1992, Trunk muscle activation while resisting asymmetrically applied loads in an axially rotated posture. in Proceedings of the Human Factors Society. vol. 1, Publ by Human Factors Soc Inc, pp. 752-756, Proceedings of the Human Factors Society 36th Annual Meeting. Part 2 (f 2), Atlanta, GA, USA, 10/12/92.
Lavender SA, Tsuang YH, Andersson GBJ. Trunk muscle activation while resisting asymmetrically applied loads in an axially rotated posture. In Proceedings of the Human Factors Society. Vol. 1. Publ by Human Factors Soc Inc. 1992. p. 752-756
Lavender, Steven A. ; Tsuang, Yang Hwei ; Andersson, Gunnar B J. / Trunk muscle activation while resisting asymmetrically applied loads in an axially rotated posture. Proceedings of the Human Factors Society. Vol. 1 Publ by Human Factors Soc Inc, 1992. pp. 752-756
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