Abstract
To evaluate physical functions in patients with chronic low back pain, it is important to evaluate trunk muscle function. Anatomical and electromyographical studies of trunk muscles in healthy subjects and patients with chronic low back pain are introduced in this paper. Many articles is published have asserted that the action of trunk muscles of patients with chronic low back pain is different from that of healthy subjects. In my research, electromyography (EMG) of trunk muscles during hip extension in the prone position was used in patients with chronic low back pain and healthy subjects. EMG showed that the action of trunk muscles during this motion in patients with chronic low back pain was weaker than that in healthy subjects, but EMG of trunk muscles during this motion after therapeutic exercises indicated improvement in patients with chronic low back pain. It has been said that EMG evaluation of the trunk muscles is an important method to use in patients with chronic low back pain.
