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Paraspinal muscle vibration alters dynamic motion of the trunk.

Authors
Arashanapalli-M; Wilson-SE
Source
J Biomech Eng 2008 Apr; 130(2):021001
NIOSHTIC No.
20038416
Abstract
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.
Keywords
Back-injuries; Neuromotor-function; Neuromuscular-system; Biomechanics; Biokinetics; Musculoskeletal-system-disorders; Muscle-function; Sensory-motor-system; Vibration-effects; Author Keywords: lumbar spine; vibration; proprioception; stability
CODEN
JBENDY
Publication Date
20080401
Document Type
Journal Article
Funding Amount
70113
Funding Type
Grant
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R03-OH-007995
Issue of Publication
2
ISSN
0148-0731
Source Name
Journal of Biomechanical Engineering
State
KS
Performing Organization
University of Kansas Lawrence
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