Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 430
  Title The ability to reproduce the neutral zero position of the head
Journal J Manipulative Physiol Ther. 1999 Jan;22(1):26-28
Peer Review Yes
Publication Type Article

Objective: To determine how precisely asymptomatic subjects can reproduce a neutral zero position of the head.

Study Design: Repeated measures of the active cervical neutral zero position.

Setting: Institute of Medical Biology (Center of Biomechanics) at Odense University.

Participants: Thirty-eight asymptomatic students from the University of Odense, male/female ratio 20:18 and mean age 24.3 years (range, 20 to 30 years).

Intervention: Measurements of the location of the neutral zero head position by use of the electrogoniometer CA-6000 Spine Motion Analyzer. Each subject's neutral zero position with eyes closed was measured 3 times. The device gives the localization of the neutral zero as coordinates in 3 dimensions (x, y, z) corresponding to the 3 motion planes.

Results: The mean difference from neutral zero in 3 motion planes was found to be 2.7 degrees in the sagittal plane, 1.0 degree in the horizontal plane, and 0.65 degree in the frontal plane.

Conclusion: We found that young adult asymptomatic subjects are very good at reproducing the neutral zero position of the head. This suggests the existence of some advanced neurologic control mechanisms. (J Manipulative Physiol Ther 1999;22:26–8)

This abstract is reproduced with the permission of the publisher; full text by subscription.


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