Abstract
Traditional biomechanical variables such as ground reaction force parameters, and kinematic variables such as abnormal movements of segments of the feet and lower limbs, are not strongly associated with common running injuries. The aim of this study was to compare traditional (kinetic and kinematic) and novel (mechanical work and power at a joint) biomechanical variables between injured runners (IJ, n = 26, 32.2±7.1 yrs, 1.76±0.08m. 74.613.7kg, anterior knee pain syndrome, n = 17;Iliotibial band friction syndrome, n = 4; medial tibial stress syndrome, n = 3; Achilles tendinosis, n = 2) and matched injury-free runners (IF, n = 43, 33.4±11.8 yrs. 1.73±0.09m, 71.4±13.2kg). Data were collected with a Vicon 3D Motion Analysis System and processed in GaitLab®. Running speeds and kinematic variables were similar, but horizontal propulsive force (BW)(IF, 0.18±0.04; IJ, 0.16±0.03)(p= 0.03), and loading rate of the vertical impact force at the peak magnitude (VLR, BW/s) (IF, 44.5±9.5; IJ, 39.8±8.6) was greater in the IF group. The peak negative knee power (PnKp in Watts/kg: IJ, 7.6±1.8; IF, 6.6±0.1) and the eccentric knee work (EKw in J/kg: IJ, 0.47±0.13; IF, 0.40±0.16) were greater in the IJ group (p < 0.05). Biomechanical variables that are associated with common running injuries are kinetic rather than kinematic, with increased PnKP and EKw being novel biomechanical descriptors in injured runners.
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