Symmetry in the motion of the left and right sides of the body has important practical significance for the everyday functioning as well as sport actions. The way of human movement symmetry evaluation is still a scientific question (Maloney, Fletcher, & Richards, 2015; Bailey, Sato, Burnett, & Stone, 2015). Many scientists noted that it could be a predicate of injury and indicator of therapy progress (An, Wong, & Cheung, 2015; Doherty, et al., 2016). Calculation of symmetry indicators that are based on biomechanical variables in static conditions does not raise any objections (Wit, 2012). Difficulties arise when we want to measure variables in dynamic conditions. One of the most often used motor task that allows identifying and analyzing biomechanical variables, such as ground reaction force, is vertical jump with arms swing, called countermovement jump (CMJ). Therefore, the aim of this study is to evaluate symmetry during the take-off phase of CMJ in training cycle of fencers. The results of ground reaction forces analysis can be used as a predicate of injury.
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