Fitzpatrick, Julie, Edward S Chambers, James R C Parkinson, Gary Frost, Jimmy D Bell, and Dr. E Louise Thomas. 2015. “Psoas Major Cross‑sectional Area: A Potential Marker of Cardiorespiratory Fitness”. International Journal of Clinical and Experimental Physiology 4 (1), 15-20. https://ijcep.org/index.php/ijcep/article/view/148.