Trunk Muscle Coactivation in Preparation for Sudden Load

Details

• Personal Author:
  Granata KP ; Orishimo KF ; Sanford AH
• Description:
  Biomechanical stability of the lumbar spine is an important factor in the etiology and control of low-back disorders. A principle component of biomechanical stability is the musculoskeletal stiffening generated by preparatory muscle coactivation. The goal of this investigation was to quantify preparatory behavior, evaluating trunk muscle activity immediately prior to sudden trunk flexion loading during static extension tasks compared to activity observed when subjects were informed no sudden load would occur. Coactive excitation was also examined as a function of fatigue and gender. Results demonstrated increased extensor muscle and flexor muscle coactivation following static fatiguing exertions, potentially compensating for reduced trunk stiffness. Female subjects produced greater flexor antagonism than in the males. No difference in the preparatory coactive muscle recruitment patterns were observed when subjects were expecting a sudden flexion load compared to recruitment patterns observed in similar static postures when subjects were informed no sudden load would be applied. This indicates the neuromuscular system relies greatly on response characteristics for the maintenance of stability in dynamic loading conditions. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Musculoskeletal Diseases Musculoskeletal System Occupational Health Safety
• Keywords:
  Back Injuries Biomechanics Manual Lifting Manual Materials Handling Muscular Disorders Musculoskeletal System Musculoskeletal System Disorders Neuromuscular System Neuromuscular System Disorders Posture Spinal Disorders Spinal Stability Spine

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• ISSN:
  1050-6411
• 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
• Pages in Document:
  247-254
• Volume:
  11
• Issue:
  4
• NIOSHTIC Number:
  nn:20029679
• Citation:
  J Electromyogr Kinesiol 2001 Aug; 11(4):247-254
• 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 Electromyography and Kinesiology
• End Date:
  20000929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:2b30a06ef97e73d85c9a07a7a1b7d309dc667e7b4e232c7f3315a7cba81d028bbd54e841d4992093a9f96ded6422c279adcdbe8af8df684b87008adf11b6726f
• Download URL:
  https://stacks.cdc.gov/view/cdc/190608/cdc_190608_DS1.pdf
• File Type:
  [PDF - 143.84 KB ]