Injury prevention

Document Type



The purpose of this study was to investigate the effects of dynamic hamstring stretch on knee joint biomechanical parameters during side-step cutting in female athletes. Methods: Ten participants performed 45-degree side-step cutting for the pre-test and post-test and then dynamic hamstring stretch included single-leg standing with straight leg raise and straight leg hip flexion intervened after pre-test, respectively. Data were collected synchronously by 8 VICON cameras (250 Hz), 1 Kistler force plate (1000 Hz), and 5 Delsys wireless EMG sensors (2000 Hz) during side-step cutting. Results: Participants showed significantly greater hamstrings activation and muscle co-contraction (H/Q ratio) on post-test during deceleration phase at the peak valgus moment. Vertical ground reaction force and knee varus moment decreased significantly on post-test during deceleration phase at the peak varus moment.. Conclusion: Dynamic stretch could increase the activation of the hamstring, and improved buffering impact of the knee joint.