Response of Trunk Muscle Coactivation to Changes in Spinal Stability

Details

• Personal Author:
  Granata KP ; Orishimo KF
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Musculoskeletal Diseases Musculoskeletal System Occupational Health Safety
• Keywords:
  Author Keywords: Low-back Back Injuries Biomechanics Co-contraction Manual Lifting Manual Materials Handling Model Muscle Muscular Disorders Musculoskeletal System Musculoskeletal System Disorders Neuromuscular System Neuromuscular System Disorders Posture Spinal Disorders Spinal Stability Spine Stability

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• ISSN:
  0021-9290
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  34
• Issue:
  9
• NIOSHTIC Number:
  nn:20029676
• Citation:
  J Biomech 2001 Sep; 34(9):1117-1123
• Contact Point Address:
  Kevin P Granata, PhD, Motion Analysis and Motor Performance Laboratory, Kluge Children's Rehabilitation Center, University of Virginia, 2270 Ivy Road, Charlottesville, VA 22903
• Email:
  kpg8n@virginia.edu
• Federal Fiscal Year:
  2001
• NORA Priority Area:
  Disease and Injury: Low Back Disorders
• Performing Organization:
  Motion Analysis and Motor Performance Laboratory, Kluge Children's Rehabilitation Center, University of Virginia, Charlottesville VA
• Peer Reviewed:
  True
• Start Date:
  19970930
• Source Full Name:
  Journal of Biomechanics
• End Date:
  20000929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:06efc6a8c004d10bc01b24b6b970f268349fcc72b4f7ec4f097635bb905362e4e01e1e2cbe69d36924306482e04942b7b52da10dc40dc056a8259f3c632e0fae
• Download URL:
  https://stacks.cdc.gov/view/cdc/190606/cdc_190606_DS1.pdf
• File Type:
  [PDF - 252.54 KB ]