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Dynamic load during reactive strength tasks
Kováč, Dan ; Hojka, Vladimír (advisor) ; Vindušková, Jitka (referee)
Title: Dynamic load during reactive strength tasks Objectives: Objectives were to explore and measure biomechanic parameters of athletes performing different reactive strength tasks using force plates. Methods: 8 male athletes (22,4 ± 1,2 years; 76,3 ± 4,3 kg) took part in experiment. Each of them performed 8 different reactive strength tasks (alternate and single leg bounds, pogo jumps on place, low hurdle jumps, high hurdle jumps 76 cm and 91 cm and long jump take off from 8 and 12 steps approach). Dynamics of tasks was measured using Kistler 9281 EA with sample rate of 1000 Hz. Main observed parameters were maximum vertical force, time to peak force, contact time and impulse. Data were processed in MATLAB R2022a (The MathWorks, Inc. Natick, Massachusetts, USA) and Microsoft Excel 2019. Results: Differences in dynamics of reactive tasks were observed among single leg and double leg exercises. Double leg exercises had much longer time to peak of vertical force than single leg exercises. Biggest vertical forces were observed during single leg bounds, where overload reached seven times body weight. On the other hand lowest peak of vertical force was measured during long jump takeoff from eight steps approach. Maximal forces got higher and contact time shorter with increased approach speed during...
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