Index to Chiropractic Literature
Index to Chiropractic Literature
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ID 24432
  Title The neuromuscular response to spinal manipulation in the presence of pain
URL http://www.jmptonline.org/article/S0161-4754%2816%2900058-0/fulltext
Journal J Manipulative Physiol Ther. 2016 May;39(4):288-293
Author(s)
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Peer Review Yes
Publication Type Article
Abstract/Notes

Objective: The purpose of this study was to evaluate differences in muscle activity in participants with and without low back pain during a side-lying lumbar diversified spinal manipulation.

Methods: Surface and indwelling electromyography at eight muscle locations were recorded during lumbar side-lying manipulations in 20 asymptomatic participants and 20 participants with low back pain. The number of muscle responses and muscle activity onset delays in relation to the manipulation impulse were compared in the 2 pain groups using mixed linear regressions. Effect sizes for all comparisons were calculated using Cohen’s d.

Results: Muscle responses occurred in 61.6% ± 23.6% of the EMG locations in the asymptomatic group and 52.8% ± 26.3% of the symptomatic group. The difference was not statistically significant but there was a small effect of pain (d = 0.350). Muscle activity onset delays were longer for the symptomatic group at every EMG location except the right side indwelling L5 electrode, and a small effect of pain was present at the left L2, quadratus lumborum and trapezius surface electrodes (d = 0.311, 0.278, and 0.265) respectively. The indwelling electrodes demonstrated greater muscle responses (P ≤ .01) and shorter muscle activity onset delays (P < .01) than the surface electrodes.

Conclusions: The results revealed trends that indicate participants with low back pain have less muscle responses, and when muscle responses are present they occur with longer onset delays following the onset of a manipulation impulse.

This abstract is reproduced with the permission of the publisher; click on the above link for free full text.


 

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