Effects of a mechanical pain stimulus on erector spinae activity before and after a spinal manipulation in patients with back pain: a preliminary investigation.

BACKGROUND Several recent studies in animal models of spinal pain have shown changes in sensory processing and in reflex muscular responses. One group of researchers reported consistent electromyographic responses in the paraspinal muscles of healthy men after spinal manipulation, and they speculated that such responses may underlie some of the observed… (More)