Can Myotonometry Quantify Dry Needling Effectiveness on Myofascial Trigger Points?

Inclusion Criteria: * Age range 18-40 years. * Healthy volunteers. * Presence of a latent medial MTrP of the soleus muscle. * Being able to provide written informed consent. * Being able to follow instructions and realize clinical tests. Exclusion Criteria: * Any history of ipsilateral lower limb severe injury or intervention (e.g. fracture, surgical intervention). * Pain or musculoskeletal injury, ligament injury, tendonitis or plantar fasciitis in the ipsilateral leg for six months previous to the intervention. * Peripheral or central nervous system neurological disease. * Altered sensitivity in the treatment area. * Treatment of a myofascial trigger point in the sural triceps in the six months previous to the intervention. * Changes in physical activity which would have affected muscle tone during the study. * Fear of needles. * No tolerance to pain caused by dry needling. * No continuance commitment.