Sport research is a key to improve performance and to prevent the risk of injury. In table tennis, many injuries are located at the upper limbs, but also at the hip joint (Nguyen et al. 2016). To investigate the origin of these hip injuries, both joint kinematics and kinetics should be taken into account. Kinetics data required the knowledge of external forces, which are usually obtained through force platforms. Force platforms measure 3D forces but are fixed in the motion analysis laboratory. As a consequence, it is often difficult to record ground reaction forces (GRF) for all foot support during sport motions, in particular in activities such as table tennis where players usually spread their legs apart and have to perform displacement to adjust their placement with respect to the incoming ball. Hence, it would be useful to make the GRF measurement under only one foot and to assess GRF under the second foot based on human bodies kinematics and inertial parameters. Some authors already have investigated this kind of GRF estimation for gait analysis (Pillet et al. 2010). However, it may be another challenge with more dynamic activities such as table tennis. The purpose of this study was to evaluate the assessment of 3D GRF under one foot based on body segments kinematics and inertial parameters, and the GRF measurement under the second foot.
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