Figure 3From: Evaluation of the immediate effect of acupuncture on pain, cervical range of motion and electromyographic activity of the upper trapezius muscle in patients with nonspecific neck pain: study protocol for a randomized controlled trialDetails of experimental setup. Two straps over the acromion -one attached directly to the chair and one attached to the support of a load cell (A); Force and electromyography activity ((B) surface electrode) of the upper trapezius muscle will be measured simultaneously during shoulder elevation movements. Feedback will be provided from the projection of a 20-inch screen on a white wall in front of the subject.Back to article page