This repository contains raw data from experiments investigating the reliability of shear-wave elastography (SWE) to assess muscle stiffness. The first dataset contains meat specimen experiments (using porcine meat specimens). The second and third datasets contain the measurements of human subjects, performed on the first and second visit to the laboratory, respectively. All values are in kilopascals (kPa). This experiment showed that SWE is a reliable tool for assessing muscle stiffness, when the probe pressure is kept constant and the muscle is examined in relaxed condition.