Influence Of Plyometric Trainings For Changes Of Strength Abilities Of Female Volleyball Players
Vol.7,No.2(2013)
The aim was to compare two groups in a time parallel 6-week experiment for selected types of plyometric training. One group trained with gradual external weight loading in eccentric phase (EXP1) and the second group increased drop height (EXP2) during drop jump training. We compared their effects on changes in selected strength abilities. We assessed the level of countermovement, vertical jump height (CMJ), standing vertical jump height (SJ) and average force gradient in squat exercises with the knee joint at 90°, by maximal isometric contraction at intervals of 0-50 ms (RFD50) and 0-200 ms (RFD200). The results showed that in CMJ EXP1 had improved by 1.01 cm (3.5%) (p<0.01). EXP2 improved by an average of 1.78 cm (5.5 %) (p<0.05). SJ in EXP1 average improved by 0.94 cm (3.5 %) (p = n.s.) in EXP2 by 1.91 cm (6.6 %) (p<0.05). In RDF50 the average increase observed after a period of training was EXP1 1.03 N.ms-1 (26.08 %) (p = n.s.) and EXP2 0.57 N.ms-1 (16.39 %) (p<0.05). In the EXP1 RFD200 the average increase was 2.51 N.ms-1 after a period of training (20.91 %) (p<0.01), while on average EXP2 improved by 1.05 N.ms-1 (10.04 %) (p = n.s.). Based on these results we recommend improving the vertical jump height with a countermovement and force gradient in longer intervals (200 ms) using an external weight in the form of small dumbbells and in eccentric phase of drop jump training. For standing jump height development and shorter time intervals of force gradient (50 ms) it is recommended to use a gradual increase in height of drop in plyometric training.
volleyball; women; strength abilities; plyometrics; vertical jump height; force gradient (RFD)
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