Countermovement Jump with the Help of Wings in 16-Year- Old Volleyball Players

Vertical jump is combined with the assessment of the strength and strength of the muscles of the lower extremities that are fundamental components of the volleyball game's work.The Countermovement Jump with arm (CMJA) test as a specific specifically for the assessment of the offensive force of volleyball players.Methods: Female (F) & Males (M) average volleyball players were tested in CMJA at the GFRP; Force(F max), Power(P max) and gravity shift relationship Jump Height(JH). Anthropometric measurements of volleyball players were also developed; Body Height (BH cm), Body Mass (BMI% kg/m2), Body Weight (BW kg). Results: The differences between the two groups found in the study resulted in significant differences in BH cm (F-172, M-187.3), BW kg (F62.2, M -79.3), BMI kg / m2 (F-21.1, M -22.6), Jump place in JP cm (F-266, M-310), Jump Attack in JA cm (F-274, M-321). But even the data captured by the Leonardo platform in the CMJA test gives us a noticeable difference between the two groups; (F-6.4,M-4.5), P max (F-3.08, M-4.78) and diff P max Left & Right(F-2.59,M-0.56),V max m/%(F-5.2,M-4.4). Conclusion: The results obtained suggest changes to the performance of volleyball players in "vertical jump" in the parameters of force, speed, and power. These indicators are valid for any trainer or volleyball player to implement a detailed and specific training program for the further development of the physical qualities of volleyball players, especially vertical tipping in gaining the lower extremity muscular power.


Introduction
The studies that I've done have consistently been the basis for the volleyball sport in the new age of 16-17years old. Achieving high levels of modernity requires a great deal of study, a research work to develop and perfect physical performance in professional sports. The important tendency in world volleyball, in addition to improving the body height of players, is the increase in the vertical jump level. In collective sports as volleyball, football, basketball besides other technical elements that these kind of sports contain it is seen even the functioning of the element "vertical jump". The best perfection of a vertical jump is achieved with a purposeful training to increase the jump height, the high degree of muscular activity achieved with a specific training program. Plyometric exercises use the stretch-shorten cycle to train the muscles to perform and perform greater work in the shortest possible time (9). Plyometric is a form of resistance exercise that refers to the stretch-shortening cycle (SSC) such as jumps or doing vertical or horizontal jumps (10). With vertical jump, we understand the athlete's ability to elevate his body's gravity center with the help of dynamic muscular work of lower extremities. Physiological studies on this discipline have shown how a volleyball player should possess and increase, through training, the ability to develop explosive strength and to reuse elastic energy. Any physical exercises, they may be defined by means of the volume expressed by work performed during jumps (2) or by the number of jumps (3) as well as by intensity, which is usually defined by such parameters as ground reaction forces (GRFP) and the rate of force development (4,5). The main purpose of this study is to evaluate the changes and the effects that training in volleyball player's female & male using the tests countermovement jump with arm (CMJA).

Methodology
The subjects of this study were 12 Female & 12 Male volleyball player participating in the championship of volleyball in Albania. The main objective is to see to these volleyball players aged 16 years old differences in changes in the measurements of some functional parameters. It will be possible to see the state of the level of volleyball player's in our country through measurement and data analysis.

Protocols of the Test Performed
Tests protocol that we used in this experiment was designed to assess the capacity of all parameters of vertical jump height. These tests called Bosco tests describe the method used to measure the power, the strength of the lower extremities. Tests are performed on laboratory equipment platform Leonardo® system Ground Reaction Force Plate (GRFP) .Countermovement jump test with the help of Arm-CMJA; Jump against action (move) without the aid of the arms CMJ, but the athlete begins testing position at attention and takes off refractive limbs bottom up to 90º with the help of the arm to pick up momentum to jump in platform GRFP. This test assesses the strength of the energy reuse explosive elastic (6). The use of wings in the vertical jump indicates the duration of an impulse.

Results
The following table 2 and graphic1 presents the average data of the two groups from field measurements. There are visible differences between the sexes. The t-test result shows that the differences between the two groups were statistically significant (sig = 0.035).

Discussion
Many researchers and practitioners are encouraged to consider this methodology and these variables as valuable and reliable measures to determine athletes' ability to perform in vertical dance. The main purpose of the CMJA test at volleyball players of these new age groups was to determine the reliability measurement of the main performance measures commonly used to determine the CMJ strength capacity qualities from GRFP data.. The long-term CMJ test is supposed to provide a measure of muscle elasticity, whereas today it is found that this test provides the mass of rapid jump force (7)where the differences between the CMJ and SJ tests proposed the "elasticity "Of athletes in the team using the concept" elasticity index "coming from the difference of these two tests. The good capacity used by elastic energy corresponds to 8-10cm. The difference between these two tests is called the fast power index. The elasticity coefficient of formula (CMJ-SJ) x100 / CMJ expressed in% is an index of accumulated energy capacity as a result of elastic muscle extension preceding muscular contraction and meanwhile from the data presented to the team Volleyball in Albania has reported a low percentage of elastic energy as a result of a poorly recommended exercise to develop this quality. The vertical jump performed by the two study groups in the CMJA test that provides the mass of the rapid jump force has been shown that volleyball players with these values are at the levels of the capacity of the low-speed force. A comparison of body height during CMJ and body weight also allows the assessment of the start of the test threshold coordination and the end of the jump stage according to GRFP (P <0.01, force p ≤ 0.05), CMJ (p <0.01, force p <p 0.01), for 8 weeks (8).

Conclusion
The team's female & male in the study had significant differences between them in the technical element of jumping and its processing. The data from this study will be available for coaches who want to improve their vertical jump performance to players. The ability to jump is an important factor of success in this sport, but it is associated with the general and specified training for the development of its performance regardless of gender players. Interpretation of the data suggests that young volleyball players are indispensable to apply the exercises that improve the dance performance as an important element in this sport. The results of this study illustrate the importance of recognizing the impact of rapid force, emphasizing the need to understand that specific assessment techniques that will identify in individual components the strength and strength qualities that affect the performance of the jump.