Neuromuscular Response to Cyclic Lumbar Twisting

Details

• Personal Author:
  Gerhardt D ; Hoops H ; Johnson K ; Le P ; Li L ; Lu Y ; Patel N ; Solomonow D ; Solomonow M ; Zhou BH
• Description:
  OBJECTIVE: to study the influence of 10 min of cyclic twisting motion on abdominal and back muscle activities. BACKGROUND: repetitive (cyclic) occupational activity was identified by many epidemiological reports to be a risk factor for the development of work-related musculoskeletal disorders. Biomechanical and physiological confirmation, however, is lacking. METHODS: trunk muscle electromyography (EMG) was recorded while participants performed a continuous 10-min maximum lumbar cyclic twisting to the left, and maximum isometric twist to the left and right sides was measured before and after the exercise. RESULTS: abdominal muscles contracted symmetrically, independent of twisting direction. The left posterior muscles' integrated EMG (IEMG) decreased during the exercise, whereas the IEMG of the right posterior muscle increased. Simultaneously with increased antagonist coactivity level of the right posterior muscles after the exercise, decrease in maximal isometric left twisting torque was observed. The abdominal muscles did not exhibit any significant changes during the exercise. After the exercise, the right abdominals demonstrated a significant increase in effort, which was independent of the direction of the maximal effort isometric test. CONCLUSIONS: the change in muscle activity is attributed to neuromuscular compensation for the development of laxity and microdamage in the soft tissue (ligaments, discs, facet capsules, etc.) of the lumbar spine. APPLICATION: the results of this study increase understanding of the risk factors associated with low back disorder induced by labor-intensive occupations that involve cyclic lateral twisting. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Demography Epidemiology Musculoskeletal Diseases Musculoskeletal System Nervous System Nervous System Diseases Occupational Health Safety
• Keywords:
  Biomechanics Demographic-characteristics Etiology Musculoskeletal-system Musculoskeletal-system-disorders Neuromotor-function Neuromuscular-function Neuromuscular-system Neuromuscular-system-disorders Physical-exercise Physiological-factors Repetitive-work

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• ISSN:
  0018-7208
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Louisiana ; OSHA Region 6
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  49
• Issue:
  5
• NIOSHTIC Number:
  nn:20032678
• Citation:
  Hum Factors 2007 Oct; 49(5):820-829
• Contact Point Address:
  Occupational Medicine Research Center, Bioengineering Laboratory, Department of Orthopaedic Surgery, Louisiana State University Health Sciences Center, 2025 Gravier Street, Suite 400, New Orleans, LA 70112
• Federal Fiscal Year:
  2008
• Performing Organization:
  Louisiana State University, Health Sciences Center, New Orleans, Louisiana
• Peer Reviewed:
  True
• Start Date:
  20000501
• Source Full Name:
  Human Factors
• End Date:
  20031030
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:0a2f7776c19ae4695f41259adf938158f4e29afb97ace3fda0ced709154c84d7d5efb15cf40820a0b95cfd8c12f9adc772ec1c11b67b4fd705fdce3ecb267e18
• Download URL:
  https://stacks.cdc.gov/view/cdc/186566/cdc_186566_DS1.pdf
• File Type:
  [PDF - 319.29 KB ]