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Vertical ground reaction force during horizontal jumps at several distances. Temporal and magnitude specificity of the vertical ground reaction forces are depicted for the parkour beginner group (BEG, black round and Figure E) and expert group (EXP, white rounds and Figure D), for the four distances tested (from 70 to 100% of maximal SLJ performance). A. Peak of minimal vertical ground reaction force expressed in % of body weight (BW). B. Peak of maximal vertical ground reaction force expressed in % of BW. C. Peak-to-peak delta of time between minimal and maximal peaks in milliseconds. D. and E. represent recordings of two representative participants, respectively from the EXP and BEG groups. Vertical ground reaction forces are depicted as a solid line for the 100%, large dashes for 90%, small dashes for 80% and dots for 70% distances. *: significant inter-distance difference (P < 0.05). #: significant inter-group difference (P < 0.05).
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