Paraspinal muscle vibration alters dynamic motion of the trunk

Details

• Personal Author:
  Arashanapalli M ; Wilson, Sara E.
• Description:
  Loss in dynamic stability of the low back has been identified as a potential factor in the etiology of low back injuries. A number of factors are important in the ability of a person to maintain an upright trunk posture including the preparatory stiffness of the trunk and the magnitude and timing of the neuromotor response. A neuromotor response requires appropriate sensing of joint motion. In this research, the role of this sensory ability in dynamic performance of the trunk was examined using a simple pendulum model of the trunk with neuromotor feedback. An increased sensory threshold was found to lead to increased torso flexion and increased delay in neuromotor response. This was confirmed experimentally using paraspinal muscle vibration which is known to alter proprioception of the muscle spindle organs. Before, during and after exposure to bilateral, paraspinal muscle vibration for 20 minutes, the dynamic response of subjects to an unexpected torso flexion load was examined. Subjects were found to have a 19.5% slower time to peak muscle activity and a 16.1% greater torso flexion during exposure to paraspinal muscle vibration. Torso flexion remained significantly increased after vibration exposure relative to before exposure. These results suggest that the neuromotor response plays an important role in trunk dynamics. Loss in sensitivity of the sensory system can have a detrimental effect on trunk dynamics, increasing delays in neuromotor response and increasing the motion of the trunk in response to an unexpected load. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Musculoskeletal Diseases Musculoskeletal System Nervous System Occupational Health Safety Sense Organs Vibration
• Keywords:
  Author Keywords: Lumbar Spine Back-injuries Biokinetics Biomechanics Muscle-function Musculoskeletal-system-disorders Neuromotor-function Neuromuscular-system Proprioception Sensory-motor-system Stability Vibration Vibration-effects

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• ISSN:
  0148-0731
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Kansas ; OSHA Region 7
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  130
• Issue:
  2
• NIOSHTIC Number:
  nn:20038416
• Citation:
  J Biomech Eng 2008 Apr; 130(2):021001
• Federal Fiscal Year:
  2008
• Performing Organization:
  University of Kansas Lawrence
• Peer Reviewed:
  True
• Start Date:
  20030930
• Source Full Name:
  Journal of Biomechanical Engineering
• End Date:
  20050929
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:1ffbca6da3a4d4a77ea1f5f018ddcbefd92fa69c433d2152dee524c9330c7c69d2bd536176c67a707b12aa84379420b6a7f283451dcc0dfd1665787271f30b57
• Download URL:
  https://stacks.cdc.gov/view/cdc/192133/cdc_192133_DS1.pdf
• File Type:
  [PDF - 419.88 KB ]