Hamstrings Are Stretched More and Faster during Accelerative Running Compared to Speed-Matched Constant-Speed Running

Hamstrings are subjected to longer lengths and faster lengthening velocities in accelerative running than in constant-speed running. This provides a potential biomechanical perspective toward understanding the occurrence of hamstring injuries during acceleration. Our results suggest that coaches and sports medicine staff should consider the accelerative nature of running in addition to running speed to quantify exposure to high-risk circumstances with long lengths and fast lengthening velocities of the hamstrings.