Describing the active region boundary of EMG-assisted biomechanical models of the low back
dc.contributor.author | Ning, Xiaopeng | |
dc.contributor.author | Jin, Sangeun | |
dc.contributor.author | Mirka, Gary | |
dc.contributor.author | Mirka, Gary | |
dc.contributor.department | Industrial and Manufacturing Systems Engineering | |
dc.date | 2018-02-18T10:31:37.000 | |
dc.date.accessioned | 2020-06-30T04:47:47Z | |
dc.date.available | 2020-06-30T04:47:47Z | |
dc.date.copyright | Sun Jan 01 00:00:00 UTC 2012 | |
dc.date.issued | 2012-06-01 | |
dc.description.abstract | <p><h4 id="x-x-absSec_1">Background</h4> <p id="x-x-sp0005">Electromyography-assisted (EMG-assisted) biomechanical models are used to characterize the muscle and joint reaction forces in the lumbar region. However, during a full-range trunk flexion, there is a transition of extension moment from the trunk extensor muscles to the passive tissues of the low back, indicating that the empirical EMG data used to drive these EMG-assisted models becomes less correlated with the extensor moment. The objectives of this study were to establish the trunk flexion angles at which the passive tissues generate substantial trunk extension moment and to document how these angles change with asymmetry. <h4 id="x-x-absSec_2">Methods</h4> <p id="x-x-sp0010">Participants performed controlled trunk flexion–extension motions in three asymmetric postures. The trunk kinematics data and the electromyographic activity from L3- and L4-level paraspinals and rectus abdominis were captured. The time-dependent net internal active moment (from an EMG-assisted model) and the net external moment were calculated. The trunk and lumbar angles at which the net internal active moment was less than 70% of the external moment were found. <h4 id="x-x-absSec_3">Findings</h4> <p id="x-x-sp0015">The trunk flexion angle at which the net internal moment reaches the stated criteria varied as a function of asymmetry of trunk flexion motion with the sagittally symmetric case providing the deepest flexion angle of 38° (asymmetry 15°: 33°; asymmetry 30°: 26°). <h4 id="x-x-absSec_4">Interpretation</h4> <p id="x-x-sp0025">These results indicate that EMG-assisted biomechanical models need to consider the role of passive tissues at trunk flexion angles significantly less than previously thought and these flexion angles vary as a function of the asymmetry and direction of motion.</p> | |
dc.description.comments | <p>This is a manuscritpt of an article from Clinical Biomechanics, 27: 422-427, (DOI:<a href="http://dx.doi.org/10.1016/j.clinbiomech.2011.11.003" target="_blank">10.1016/j.clinbiomech.2011.11.003</a>). © 2012. This manuscript version is made available under the CC-BY-NC-ND 4.0 license <a href="http://creativecommons.org/licenses/by-nc-nd/4.0/%20" target="_blank">http://creativecommons.org/licenses/by-nc-nd/4.0/</a></p> | |
dc.format.mimetype | application/pdf | |
dc.identifier | archive/lib.dr.iastate.edu/imse_pubs/122/ | |
dc.identifier.articleid | 1120 | |
dc.identifier.contextkey | 10150653 | |
dc.identifier.s3bucket | isulib-bepress-aws-west | |
dc.identifier.submissionpath | imse_pubs/122 | |
dc.identifier.uri | https://dr.lib.iastate.edu/handle/20.500.12876/44411 | |
dc.language.iso | en | |
dc.source.bitstream | archive/lib.dr.iastate.edu/imse_pubs/122/2012_Mirka_DescribingActive.pdf|||Fri Jan 14 19:15:25 UTC 2022 | |
dc.source.uri | 10.1016/j.clinbiomech.2011.11.003 | |
dc.subject.disciplines | Ergonomics | |
dc.subject.disciplines | Industrial Engineering | |
dc.subject.keywords | Electromyography-assisted model | |
dc.subject.keywords | Passive moment | |
dc.subject.keywords | Asymmetric bending | |
dc.title | Describing the active region boundary of EMG-assisted biomechanical models of the low back | |
dc.type | article | |
dc.type.genre | article | |
dspace.entity.type | Publication | |
relation.isAuthorOfPublication | c54dc779-727e-40ea-9567-35088383d9c9 | |
relation.isOrgUnitOfPublication | 51d8b1a0-5b93-4ee8-990a-a0e04d3501b1 |
File
Original bundle
1 - 1 of 1
No Thumbnail Available
- Name:
- 2012_Mirka_DescribingActive.pdf
- Size:
- 354.14 KB
- Format:
- Adobe Portable Document Format
- Description: