Fig. 3.

Surface electromyology (sEMG) comparison of pre- and post-intervention. A set of handheld electrodes is applied to the paraspinal muscle group for each measured level. The levels of muscle tension are expressed with the length and color of the bars in the schematic representation. The electrophysiological (EP) stress score is the sum of all muscle activity on the spine, measured in microvolts. (A) High readings reflect spasm in the neck and thoracic paraspinal muscles at initial presentation. (B) Normalized sEMG signal of the paraspinal muscles and dropped EP stress score are positively correlated with symptom relief after the nine-month chiropractic therapy. Mild muscle tension sustained in the right neck, shoulder, and mid-back.