Abstract
Implementation of a vertical jump is usually evaluated in three types of execution. The observing group was composed from top level players (n=30; age=26,4+-5,3 years; height=183+-4,8 cm; weight=79+-7,5 kg).
The lower limbs strength was scanned by Kistler Force platform (KISTLER Instrumente AG, Switzerland). Participants performed three types of a vertical jump, T1 - CMJ-F, T2 - CMJ, T3 - SQJ and three successful trials of each type of the jump.
The best performed trial was chosen for the evaluation. The maximum height of the jump was achieved in the first type when h1 = 0,441 +- 0.049 m.
This result was better by 12,2% (0,054 m) compared to the jump from standing position without the arm support (T2) and by 21% (0.093 m) higher than the squat jump without the arm support (T3). Variance between the best and worst performance, i.e. jump height (h) was comparable in all types of jump implementation (T1var = 0,18 m, T2var = 0,16 m, T3var = 0,17 m).
In all types of the vertical jump we noticed shorter times of the braking phase (t1) compared to the time needed for individual the take off (t2). In the case of the braking phase, variance was t1varT1 = 0.16 s and in a reflective phase t2varT2 = 0,18 s.
Similar intraindividual variability was found in test T2 at both phases of the take off (t1varT2 = 0,11, i.e. t2varT2 = 0,16 s). Highest variance was found in the reflective phase in the squat jump without the help of arms, when t2varT3 = 0,21 s