Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 16266
  Title Contribution of ribcage movement to thoracolumbar posteroanterior stiffness
URL http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=12704310
Journal J Manipulative Physiol Ther. 2003 Mar-Apr;26(3):176-183
Author(s)
Subject(s)
Peer Review Yes
Publication Type Article
Abstract/Notes OBJECTIVE: To investigate (1) whether thoracolumbar posteroanterior (PA) stiffness differs between 2 conditions of ribcage movement: unconstrained and constrained, and (2) whether the effect of ribcage constraint on PA stiffness varies according to where the PA force is applied.

DESIGN: Two-factor within-subjects design.

SETTING: Spinal Mechanics Laboratory, University of Sydney.

INTERVENTION: A convenience sample of 41 subjects, asymptomatic for back pain, participated. PA stiffness at T12-L4 was measured in the unconstrained and constrained ribcage conditions with a mechanical device. For the constrained condition, we used a clamping device to apply a force to the subject's lower thorax to reduce movement. Main outcome measures: PA stiffness at T12-L4 under both ribcage conditions.

RESULTS: PA stiffness at T12-L4 significantly increased when the ribcage was constrained (P<.05). However, the effect of ribcage movement did not depend on the location of the PA force.

CONCLUSIONS: These findings suggest that the properties of the ribcage influence measures of PA stiffness in the thoracolumbar (T12-L4) spine uniformly. Variations in PA stiffness in segments T12-L4 may reflect the properties of the intervertebral joints.

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