Abstract
Oftentimes while conducting biomechanical analyses in attempts to understand injury (e.g., ACL and ankle) risk factors mean scores of several trials are utilized to evaluate individual movement patterns; yet, analysis of inter-trial variability within a single session merits further consideration. PURPOSE: The purpose of this study was to analyze inter-trial reliability within one session of performing a jump-landing task from a box. The study aimed to evaluate inter-trial reliability on the kinetic variables (vertical ground reaction force and proximal tibial anterior shear force) at three instants (maximum vertical ground reaction force (MVGRF), maximum knee flexion (MKF), and maximum proximal tibial anterior shear force (MPTASF) in a jump-landing task across gender. METHODS: Twenty-five males (24±2.3yrs, 178.6±7.2cm, and 84.1±13.1kg) and twenty-five females (23±2.5yrs, 167.2±7.4cm, and 62.8±8.5kg) were selected from a sample of convenience from a university student population. 3-D electromagnetic motion analysis sensors sampling at 1 00Hz and two Bertec force plates sampling at 1000 Hz were used for data collection. Five trials were conducted and each trial was considered as a separate data point and evaluated using an intraclass correlation coefficient model (ICC 2,k) to analyze the reliability of each variable at different time instants. RESULTS: All variables were significant different at p<0.05. Moderate to poor reliability was shown for vertical ground reaction force (0.67) and proximal tibial anterior shear force (0.32) at MVGRF across gender with minimal differences between males (0.62, 0.24) and females (0.73, 0.44), respectively. The maximum kinetic values also revealed poor reliability (MVGRF 0.35 and MPTASF 0.38) across gender with minimal differences between genders (females=0.28, vs. males=0.42). Fair reliability was found for vertical ground reaction force at MKF (0.71), with females showing better reliability (0.84) as compared to their male counterparts (0.63). CONCLUSION: Five trials during a single-session jump landing task showed poor to fair reliability within ground reaction force and proximal tibial anterior shear force across gender. Future studies should focus on evaluating the inter-trial variability of kinetic data across multiple sessions.
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