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Activator Methods International Ltd.
2950 N. Seventh Street, Suite 200
Phoenix, AZ 85014
ofc 602-224-0220
fax 602-224-0230
toll free 1-800-598-0224
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Title: Spinal Manipulation Alters Electromyographic Activity of Paraspinal Muscles: A Descriptive Study
Reference: James W. DeVocht, DC, PhD, Joel G. Pickar, DC, PhD, and David G. Wilder, PhD
ABSTRACT
Objective: To examine the effect of spinal manipulation on electromyographic (EMG) activity in areas of localized tight
muscle bundles of the low back.
Methods: Surface EMG activity was collected from 16 participants in 2 chiropractic offices during the 5 to 10 minutes of
the treatment protocol. Electrodes were placed over the 2 sites of greatest paraspinal muscle tension as determined by
manual palpation. Spinal manipulation was administered to 8 participants using Activator protocol; the other 8 were treated
using Diversified protocol.
Results: Electromyographic activity decreased by at least 25% after treatment in 24 of the 31 sites that were monitored.
There was less than 25% change at 3 sites and more than 25% increase at 4 sites. Multiple distinct increases and decreases
were observed in many data plots.
Conclusions: The results of this study indicate that manipulation induces a virtually immediate change, usually a
reduction, in resting EMG levels in at least some patients with low back pain and tight paraspinal muscle bundles. In some
cases, EMG activity increased during the treatment protocol and then usually, but not always, decreased to a level lower
than the pretreatment level. (J Manipulative Physiol Ther 2005;28:465Q471)
Key Indexing Terms: Chiropractic; Electromyography; Manipulation; Spinal
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