Effect of Instrument-Assisted Soft Tissue Mobilization on Gastrocnemius Stiffness and Ankle Range of Motion

This interventional study aims to evaluate the acute effects of instrument-assisted soft tissue mobilization (IASTM) on the stiffness of the gastrocnemius muscle and ankle dorsiflexion range of motion. Muscle stiffness will be quantified using shear-wave elastography (SWE), a non-invasive ultrasound technique that measures tissue mechanical properties in real time. Ankle dorsiflexion range of motion will be assessed using the weight-bearing lunge test with the knee extended, a reliable functional measure of ankle mobility. Participants will undergo baseline measurements followed by a standardized IASTM intervention targeting the gastrocnemius muscle. Post-treatment assessments will be conducted immediately afterward to capture acute changes. The study is designed to improve understanding of how IASTM influences muscle mechanical properties and functional joint mobility. Findings may have implications for the clinical use of IASTM in both rehabilitation and performance contexts.