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چکیده
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The purpose of this study was to examine the effectiveness of 12-week plyometric training on vertical jump performance (Vj), maximal surface EMG, M-wave amplitude, M-wave latency, and nerve conduction velocity (NCV) in men volleyball player. Thirty volunteers of junior high school volleyball players (age: 17.53 0.74; Height: 177.67 3.14; Weight: 61.31 5.32) were divided into plyometric training (PT) (n=15) and control group (c) (n=15). PT group trained 3d.w_1 but C group didn’t participate in this training. Both groups were pre- and post tested in EMG, M-wave parameters, NCV and Vj test. Tow way ANOVA (group*time interaction) and Bonferroni post hocs test demonstrated significant differences (P<0.05) in PT group of pre to post test in VJ performance (9.67 %) and in M-wave latency 16.55 %_ ; nerve conduction velocity 14.19 %_ ; there is no significant differences in IEMG (4.6 5 %_ ) and M-wave amplitude (20.91%_ ), but there is no significant improvement during this period in control group. Comparison between groups after 12wk showed that there was a significant improvement in Latency (16.74 % _ ) and NCV (19.10% _ ) in PT group during the course of the study than C group (P<0.05). based on the results of this study, it is possible to conclude that coaches and trainers consider PT as a strategy for increasing volleyball players’ explosive performance that may have taken place in neuromuscular responses such as; optimizing motor unites (MU) pattern, optimizing MUs recruitment, augmentation in nerve conduction velocity, decrement in reflex excitability of the motor pool.
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