At the first failure, only the peak force was significantly altered, with a significant reduction in peak force in the STFJDX2 group (*p = 0.028) compared to the SHAMX2 group. There were no differences detected in any other biomechanical metric measured at first failure. At tissue rupture, the vertebral displacement was also significantly lower (*p = 0.041) in the STFJDX2 group compared to the SHAMX2 group; peak force remained significantly decreased at tissue rupture (*p = 0.014) following repeated STFJDs.