Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Response of trunk muscle coactivation to changes in spinal stability.

Authors
Granata-KP; Orishimo-KF
Source
J Biomech 2001 Sep; 34(9):1117-1123
NIOSHTIC No.
20029676
Abstract
The goal of this effort was to assess the neuromuscular response to changes in spinal stability. Biomechanical models suggest that antagonistic co-contraction may be related to stability constraints during lifting exertions. A two-dimensional biomechanical model of spinal equilibrium and stability was developed to predict trunk muscle co-contraction as a function of lifting height and external load. The model predicted antagonistic co-contraction must increase with potential energy of the system even when the external moment was maintained at a constant value. Predicted trends were compared with measured electromyographic (EMG) data recorded during static trunk extension exertions wherein subjects held weighted barbells at specific horizontal and vertical locations relative to the lumbo-sacral spine junction. The task was designed to assure the applied moment was identical during each height condition, thereby changing potential energy without influencing moment. Measured EMG activity in the trunk flexors increased with height of the external load as predicted by the model. Gender difference in spinal stability were also noted. Results empirically demonstrate that the neuromuscular system responds to changes in spinal stability and provide insight into the recruitment of trunk muscle activity.
Keywords
Back-injuries; Musculoskeletal-system; Musculoskeletal-system-disorders; Posture; Spine; Spinal-disorders; Spinal-stability; Muscular-disorders; Neuromuscular-system; Neuromuscular-system-disorders; Manual-lifting; Manual-materials-handling; Biomechanics
Contact
Kevin P Granata, PhD, Motion Analysis and Motor Performance Laboratory, Kluge Children's Rehabilitation Center, University of Virginia, 2270 Ivy Road, Charlottesville, VA 22903
CODEN
JBMCB5
Publication Date
20010901
Document Type
Journal Article
Email Address
kpg8n@virginia.edu
Funding Amount
160768
Funding Type
Grant
Fiscal Year
2001
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-000158
Issue of Publication
9
ISSN
0021-9290
Priority Area
Disease and Injury: Low Back Disorders
Source Name
Journal of Biomechanics
State
VA
Performing Organization
Motion Analysis and Motor Performance Laboratory, Kluge Children's Rehabilitation Center, University of Virginia, Charlottesville VA
TOP