Identification of Explosive Force in 15-year Old Volleyball Players
AbstractAssessment of physical features, especially vertical jump performance in various GRFP is of particular importance in advancing and determining the physical abilities of young age groups in volleyball. The purpose of this study is to evaluate the performance of vertical jump in volleyball in Albania. Method; 181 volleyball players were tested, including 106 female (F) and 75 men (M) with an average age of 15-16 years, BH cm(F-177/M-191), BW kg(F-64.3/M-79.5), BMI kg/m² (F-20.39/M-21.88). Field tests Attack cm(F-285.3/M-323.7), Block cm(F-274.6/M-310.3.In three tests Bosco; Squat Jump (SJ), Countermovement Jump (CMJ), Repeat Jump (RJ 15sec) tests were conducted on the Ergo Jump System platform. The average values according to the calculations in the index of elasticity and elastic energy of the lower extremities of volleyball players as well as the index of explosive force are shown. Results: The fast power index is derived from the CMJ-SJ test difference and showed that (F-5.6/M-7). The coefficient of elasticity is expressed in% by the formula (CMJ-SJ) x100 / CMJ where it showed the values of (F-17.3% /M-16.2%), while in the RJ15sec test of anaerobic power showed the values where (F-0.8/M-0. 7).Conclusions: Tests conducted in these age groups of volleyball players in Albania clearly showed that they have unused reserves of elastic muscle energy. The capacity of the strength index in team sports in teams reaches values up to 0.90-0.95 but F&M volleyball players showed values of 0.7-0.8, is a low capacity of reactive force resistance, which results from the lack of plyometric training. The mechanical strength during the RJ15sec jump proved to be a very sensitive functional parameter that individualizes the features and characteristics of the anaerobic element of lactic acid related to training.
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