Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 19496
  Title Influence of posture on the range of axial rotation and coupled lateral flexion of the thoracic spine
Journal J Manipulative Physiol Ther. 2007 Mar-Apr;30(3):193-199
Peer Review Yes
Publication Type Article
Abstract/Notes OBJECTIVE: This study examines the influence of posture on the range of axial rotation of the thorax and the range and direction of the coupled lateral flexion.

METHODS: The ranges of mid thoracic axial rotation and coupled lateral flexion were measured in 52 asymptomatic subjects (aged 18-43 years) using an optical motion analysis system. To examine the influence of posture on primary and coupled motion, we initiated axial rotation from a neutral sitting posture and from end-range thoracic flexion and extension.

RESULTS: There was a significant decrease in the range of thoracic rotation in flexion compared with the neutral and extended postures (P < .001). The mean range of coupled lateral flexion was 8.9% of the axial rotation range in the neutral posture and increased to 14.3% and 23.2% in the extended and flexed postures, respectively. Patterns of coupled motion varied between subjects, but an ipsilateral pattern was more common in the flexed posture, whereas a contralateral pattern was more common in the neutral and extended postures.

CONCLUSIONS: The ranges and patterns of coupled motion of the thorax appear to be strongly influenced by the posture from which the movement is initiated. This has important implications in relation to the interpretation of clinical tests of thoracic motion and in consideration of mechanisms of development of thoracic pain disorders.
First author: S.J. Edmondston

This abstract is reproduced with the permission of the publisher. Click on the above link for the PubMed record.

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