Utilising field-based technology to explore the relationship between high-speed running biomechanics and hamstring strain injury

Abstract

This PhD thesis investigated the relationship between high-speed running biomechanics and hamstring strain injury (HSI). Exploration and utilisation of portable technology became critical constituents of this research, ensuring the running biomechanical variables investigated reflected that of real-world, field-based settings. First, a systematic review was conducted to summarise the existing evidence on the relationship between running biomechanics and HSI and, direct any spatiotemporal, kinematic and kinetic aspects requiring further investigation. Next, the methodological considerations for quantifying running biomechanical variables of interest in a field-based environment was explored, which led to validation of an inertial measurement unit system against the gold standard 3D Motion Analysis Laboratory. Validated kinematic and spatiotemporal outcome measures were then utilised in a field-based observational study (combined cross-sectional and prospective cohort study), investigating variances in running biomechanics as a risk factor for HSI. Force-velocity profiling (FVP), a previously validated novel portable method for quantifying kinetic outcome variables, was also incorporated in the study. Inopportunely, restrictions imposed with COVID-19 adversely impacted recruitment in the study, resulting in a limited sample size. Nevertheless, the study facilitated a good feasibility trial of novel technology, and the biomechanical findings present a case for further investigation. Key findings included preliminary evidence that reduced anterior pelvic tilt at point of contact and a velocity-oriented FVP was associated with HSI. This research culminates with a detailed discussion of research findings, as well as practical insights for future adoption of portable technologies for high-speed running biomechanical analysis and recommendations for further research in the HSI prevention realm.