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Category

Running & Jumping

Document Type

Paper

Abstract

Fatigue is thought to be a contributing factor to hamstring injury during sprint running. Injuries can happen during acceleration or maximum speed phases between peak hip flexion and foot-strike, when the hamstring muscle-tendon unit (MTU) is at its longest. The angular displacements of the bones onto which the muscles attach influence hamstring MTU lengths, thus any fatigue-induced alterations to these displacements may be expected to influence MTU lengths, and thus injury risk. We collected 3-D kinematics and modelled hamstring MTU kinematics during the initial three steps of acceleration and two continuous steps of maximum speed sprinting before and after a 45-minute simulated soccer match. Hamstring MTUs exhibited longer lengths during maximum speed compared to acceleration. In maximum speed sprinting, an increase in peak biceps femoris long head (BFlh) length (7 mm) was observed.

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