McHugh, M., S. Kwiecien, M. Hannon, and R. Stewart. “G-Force Exposure in a Contact Sport: The Use of Accelerometers to Quantify Physical Stress”. Journal of Sports Research, vol. 1, no. 1, Sept. 2014, pp. 12-21, doi:10.18488/journal.90/2014.1.1/90.1.12.21.