The therapeutic action of Dry Needling on the myofascial trigger point is still not fully elucidated. It is believed that there is a systemic effect through the release of endogenous opioids and local, through mechanical stimulation of the needle insertion site. The aim of the study was to compare the effectiveness of dry needling for pain relief with the insertion of the needle into the trigger point and not into a painful upper trapezius muscle belly. We selected college students with a latent trigger point in the trapezius muscle of the dominant side. The volunteers were randomly divided into two groups: Group A ( n = 15 ) was subjected to the Dry Needling technique based on Gunn directly into the trigger point and Group B ( n = 15 ), where the needle was inserted into a region free of pain in the trapezius muscle belly. Evaluation of groups was performed using a visual analog scale of pain and pressure pain threshold using an algometer at three different times: before, immediately after the conduct and at the completion of 48 hours of Dry Needling. Results: intra groups showed greater efficiency and immediately revealed Dry Needling after performing the technique directly on trigger point. When comparing the groups, statistically significant results were obtained immediately after application of the technique in group A. These results demonstrate that the performance of Dry Needling is most effective when it is performed at the site of pain, which shows the importance of acting locally to promote pro-inflammatory factors for reducing the symptoms of trigger point.
© 2014 Published by Elsevier Inc.