Comparative Study, Between Dry Needling Techniques, in the Evolution of Myofascial Pain Shoulder in Athletes. Elastography as Indicator in the Repair of Myofascial Tissue, Post-dry Needling.

This technique follows the criteria established by Dr Hong C-Z. This technique is known as "fast in and fast out technique" and uses repeated insertion of the acupuncture needle in the myofascial trigger point, with the aim to get multiple local twitch responses. The technique ends when the local twitch responses disappear.

Technique proposed by the main investigator and based on the studies of Professor Dr. Jay P. Shah and the mechanisms of neuromodulation that transmits us the acupuncture scientific evidence.

The Fascial Mechanotransduction Dry Needling Technique, strikes with the acupuncture needle until it reaches and pierces the myofascial trigger point. Then the acupuncture needle is rolled in the connective tissue, which causes an intense coupler that we define as "needle grasp". Finally, the acupuncture needling is pulled-out twice. The screwing and the two pull-out of the acupuncture needle is performed in the infraspinatus and supraspinatus muscles and we describe it as mechanotransduction cycle. Each cycle lasts 30 seconds and the whole technique lasts 3 minutes per session.

Technique with a total duration of 3 minutes per session: * To locate the myofascial trigger points of infraspinatus and supraspinatus muscles and put each bridle on them. * Monitor longitudinally taut band, with index and middle fingers. * Percuss with tube and needle placebo (Sham needle) on Infraspinatus. * Remove the tube and needle placebo from the device. Reintroducing the placebo needle into the tube and strike on the supraspinatus. Repeat this sequence without interruption for 3 minutes. * Remove the bridles and perform hemostasis with cotton. * We will give end to the technique placebo of dry needling.