Neuromuscular Control of Lumbar Instability Following Static Work of Various Loads

Details

• Personal Author:
  Davidson B ; Le B ; Lu Y ; Patel V ; Solomonow D ; Solomonow M ; Zhou BH
• Description:
  Neuromuscular control of lumbar stability following exposure to prolonged static work, under low and high loads, was assessed in the in vivo feline model. Six sessions of 10 min work at 20N with 10 min between rest was compared to a group subjected to the same protocol but carrying high loads of 60N. Displacement and tension developed in the spine at the instant the multifidus muscles applied stabilizing contractions, and their amplitudes were obtained from their electromyogram (EMG). Significant (P < 0.001) laxity developed in the various viscoelastic tissues of the lumbar spine that did not recover during and up to 7 h of rest postwork. Simultaneously, there was a significant (P < 0.001) decrease in muscular activity in the 3-4 h immediately postwork under low load but only during the first hour in the high load group. After that period the musculature compensated for the laxity of the viscoelastic tissues by a significant (P < 0.001) increase in activity in the high-load group and a nonsignificant increase in the low group. It was concluded that during 1-3 h immediately poststatic work a significant decrease in the stabilizing function of viscoelastic tissues together with a significant decrease in muscular activity is present, and they render the spine unstable and exposed to high risk of injury. Performance of prolonged static work under low loads, while not harmful during the work, cannot be designated as a "no-risk" condition, as it may result in injury postwork. [Description provided by NIOSH]
• Subjects:
  Animals Biomechanical Phenomena Cumulative Trauma Disorders Fatigue Laboratories Musculoskeletal Diseases Nervous System Nervous System Diseases Occupational Health Risk Assessment Risk Factors Safety

  More +
• Keywords:
  Animal-studies Author Keywords: Spine Back-injuries Biomechanics Cumulative-trauma-disorders EMG Laboratory-animals Laboratory-testing Lumbar Multifidus Muscles Musculoskeletal-system-disorders Neuromuscular-system-disorders Physiological-effects Physiological-factors Physiological-fatigue Physiological-measurements Physiological-response Rest-periods Risk-factors Stability

  More +
• ISSN:
  0148-639X
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Colorado ; Louisiana ; OSHA Region 6 ; OSHA Region 8
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  71-82
• Volume:
  38
• Issue:
  1
• NIOSHTIC Number:
  nn:20035131
• Citation:
  Muscle Nerve 2009 Jan; 39(1):71-82
• Contact Point Address:
  Moshe Solomonow, Musculoskeletal Disorders Research Laboratory, Bioengineering Division, Department of Orthopedic Surgery, Health Sciences Center, 12800 E. 19th Avenue, RC-1 N, Mail Stop 8343, PO Box 6511, Denver, Colorado 80045
• Email:
  moshe.solomonow@ucdenver.edu
• Federal Fiscal Year:
  2009
• Performing Organization:
  Louisiana State University, Health Sciences Center, New Orleans, Louisiana
• Peer Reviewed:
  True
• Start Date:
  20000501
• Source Full Name:
  Muscle & Nerve
• End Date:
  20031030
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:717c39a65da58efbb22aaaecd1958dd1d47413857357c962b961b295280edb66b0ad3143d08c22c6ffb9749d361a6fa62eccfa733cdb1226b6cf02e276165a4f
• Download URL:
  https://stacks.cdc.gov/view/cdc/187087/cdc_187087_DS1.pdf
• File Type:
  [PDF - 444.39 KB ]