Symmetry during the take-off phase of countermovement jump in fencers

摘要

Symmetry in the motion of the left and right sides of the body has important practical significancefor the everyday functioning as well as sport actions. The way of human movement symmetryevaluation is still a scientific question (Maloney, Fletcher,andRichards, 2015; Bailey, Sato, Burnett,Stone, 2015). Many scientists noted that it could be a predicate of injury and indicator of therapyprogress (An, Wong,andCheung, 2015; Doherty, et al., 2016). Calculation of symmetry indicators thatare 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 oftenused motor task that allows identifying and analyzing biomechanical variables, such as groundreaction 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 offencers. The results of ground reaction forces analysis can be used as a predicate of injury.