Effects of Plyometric Training With Core Exercises Program on Jump Service Ability among Men Volley Ball Players

The word plyometric exercises come from Greek, which means ―length‖. Length refers powerful movements for enhanced performance. Plyometric exercises are key to develop maximal explosive power and speed movements (Hatfield, 1986). Plyometric exercises movements enable a muscle to reach maximal strength in as short a time as possible (Baechle, 1994). The fundamental movements of volleyball game are spike jump and block jump. Explosive power means jumping abilities. Volleyball players jumping ability are frequently used to measured lower limb explosive strength. Spike jump and block jump needed explosive power of leg to do successfully. Plyometric training program increase spike jump and block jump of volleyball players (Milic et al., 2008). Explosive strength exercises improve volleyball player‘s movement and reduce the risk of injury (Hrzenjak 2004). Plyometric training improves the volleyball player‘s vertical jumping ability. Plyometric exercises that exploit the stretch-shortening cycle of muscle, during stretch [deceleration phase] muscle store energy and during shortening [acceleration phase] muscle release energy (Asmussen, 1974 & Bosco, et. al., 1982). Wager and Kocak (1997) found that the rapid eccentric movement of muscles creates a stretch reflex that produces a more forceful concentric muscle action. Bergmark (1989) stated that centre of gravity is located in lumbo pelvic-hip region. Lumbo pelvic-hip region is the core area of the body with twenty nine muscles of insertion from where all physical movements begin. Core stability is the motor control. Clark et al., (2000) stated that main function of core muscles to maintain dynamic postural equilibrium and postural alignment during physical functional activities, which assist to avoid distortion patterns and thus improve athletic performance. King (2000). Stated that core stabilization exercises used in rehabilitation programs in patients with low back pain to increase the muscular strength and endurance of lumbo pelvic-hip region 29 muscles. Some studies found that core stabilization training improves balance in people with mentally retarded and deaf students (Hessari et al., 2011). Core body to move freely (Latey, 2001).

The purpose of the study was to investigate the ―effects of plyometric training with core exercises on jump service ability performance among men volley ball players‖.

1. To measure the influence of plyometric training treatment on jump service performance ability of volley ball players. 2. To evaluate the impact of core training treatment on jump service ability performance of volley ball players. 3. The examined the effect of combined training treatment on jump service ability performance ability of volley ball players. 4. To understand the changes between plyometric training, core training, and combined training on jump service performance ability of Volley ball players.

• It was hypothesis that there will be a significant improvement on jump service ability performance after the twelve weeks of training in plyometric group, core training group volley ball players and combined training group [plyometric and core training] group volley ball players when compared with control group volley ball players. • It was hypothesis that combined training group volley ball players will be superior to the plyometric training group and core training group volley ball player on jump service ability performance.

The purpose of this study was to find out the effects of Plyometric training with core exercises on jump service ability performance among men volley ball players. To achieve the purpose of this study investigator has selected N=60 men inter collegiate level and state level participate volley ball players at random from various college of various college of Rajiv Gandhi University of Knowledge Technologies Nuzvid, Krishna district, of Andhra Pradesh and their age range from eighteen to twenty five years as per their college record.. The volley ball players chosen for study was divided into four groups each groups consisted of twelve volley ball players and core training were given to group ‗B‘ [CTG], Combined training of plyometric and core training were given to group ‗C‘ [CPCTG] and the ‗CG‘ control group ‗D‘ was restricted to participate in any of the training programme other than their regular activities. Training was given three days in a week for twelve weeks to PTG, CTG and CPCTG volley ball players. The subject were tested on jump service ability performacne at the beginning (Pre-test) and at the end of the experimental period (Post-test). To measure the jump service ability performance Russell–Lange Volley ball Test were used respectively because of their simplicity and availability of necessary facilities, instrument and equipment‘s. The analysis of data on Russell–Lange Volley ball test data have been examine by ANCOVA in order to determine the differences if any among the group at pre and posttest.

PTG: Plyometric training group Volleyball players; CTG: Core training group Volleyball players; CPCTG: Combined plyometric and core training group Volleyball players; CG: Control group Volleyball players Required table F-ratio at 0.05 level of confidence for 3 and 56 (df) =2.77, 3 and 55 (df) =2.77. *Significant. The above table-I shows that there is a significant difference on jump service ability perofrmance among the four groups such as plyometric training group [PTG], core training group (CTG), combined training of plyometric and core training [CPCTG] and control group (CG). Since the calculated ‗F‘ value required being significant at 0.05 level for d/f 3, 56 and 3, 55 are 2.77 and 2.77, but the calculated values of jump service ability performance post and adjusted posttest ‗F‘ values are 27.37 and 62.19 respectively. Which are higher than the tabulated

significant.

The mean difference PTG volley ball players and CTG volley ball players, PTG volley ball players and CG volley ball players, CTG volley ball players and CPCTG volley ball players, CTG volley ball players and CG volley ball players, CPCTG and CG volley ball players were 2.72, 8.85, 4.78, 6.13 and 10.91 which are higher than the CI value 2.44. Therefore study approved that there is significant differences exist between above groups on volley ball players. Further the study proved that there is no significant difference between PTG and CPCTG. The prior test mean value, post test mean values and adjusted post test mean values of PTG, CTG, CPCTG and CG volley ball players for jump service ability performance displayed in bar graph

• In the first hypothesis it was stated that there will be a significant improvement on jump service ability after the twelve weeks of training in plyometric group, core training group volley ball player, and combined training group [plyometric exercises and core training] group volley ball players when players. The result of the study found that experimental group‘s volley ball players jump service ability performance level improved when compared with control group. Hence the research hypothesis is accepted. • In second hypothesis mention that combined training group volley ball players will be superior to the plyometric training group and core training group badminton player. The study found no significant difference between plyometric training groups and combined training group volley ball players. Hence research second hypothesis rejected.

The statistical result on jump service ability - Russell–Lange Volley ball Test concluded that plyometric training group volley ball players [PTG], core training group volley ball players [CTG], The study further proved that plyometric training group volley ball players [PTG] score more numbers on jump service ability - Russell–Lange Volley ball Test than core training group volley ball players [CTG]. Whereas no significant changes between plyometric training group volley ball players [PTG] and combined plyometric and core training group volley ball players [CPCTG] on jump service ability - Russell–Lange Volley ball test. Finally combined plyometric and core training group volley ball players [CPCTG] score more number than core training group volley ball players [CTG] on jump service ability.

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PhD Research Scholar, University College of Physical Education and Sports sciences, Acharya Nagarjuna University, AP