Get full access to this article View all access and purchase options for this article. References 1. Askling CM, Tengvar M, Saartok T, Thorstensson A. Acute first-time hamstring strains during high-speed running: a longitudinal study including clinical and magnetic resonance imaging findings. Am J Sports Med. 2007;35(2):197-206. 2. Askling CM, Tengvar M, Saartok T, Thorstensson A.