Hamstring strain injury is a significant problem for many athletes [1]. Muscle-tendon (MT) length changes and activation patterns during the sprinting cycle likely contribute to the high risk of injury. It has been suggested that injury may occur during the late swing phase of the sprinting cycle when the hamstring fibers experience activated muscle lengthening [2]. Of the hamstrings muscles, the biceps femoris longhead (BFLH) is the most commonly injured, with the injury most frequently localized along the proximal muscle-tendon junction [3]. We hypothesize that the injuries are localized in this region because it is also the area of highest localized strains.

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