The purpose of this study is to explore the cortical regulation of the paraspinal muscles in
chronic low back pain. These (possible) changes in regulatory mechanisms are being compared
to other motor control tests in order to determine whether correlations are found.
Furthermore the patients are being treated with repetitive transcranial magnetic stimulation
(rTMS) and tested afterwards. The purpose is to find out if rTMS-therapy is capable of
normalizing motor control deficits.