چكيده لاتين
Background and Aim: In different sports, preparation and warming of the body is an important factor in preventing injury and achieving optimal performance and are considered by athletes. Post-Activation Potentiation is a phenomenon to development of force or the ability to produce force following voluntary contractions before the main performance. The main purpose of this study was to investigate the effect of a periode of post-activation potentiation activity on muscle power and Torque, vertical jump, agility and speedin elite youth soccer players.
Methods:In this quasi-experimental study, 20 players of Sepahan soccer club divided homogeneously into control (Mean age: 20.72± 0.46; Height: 180±5.59; weight: 66.7±3.73) and experimental (Mean age: 20.50± 0.70; Height: 182.40±4.30; Weight: 74.64±5.15) groups. The players have at least 6 years experiences in professional soccer premier league competitions. The statistical sample of the research was available and the players were evaluated in the variables of vertical jump, speed, agility, power ratio of quadriceps to hamstring, average power in quadriceps and hamstrings and peak torque in quadriceps and hamstrings. Data analysis was performed using inferential statistics of analysis of covariance at a confidence level of 0.95.
Results:The findings showed that there were no significant differences between the mean of vertical jump (experimental: 65.70±11.54 vs. control 63.09±12.58), agility (experimental: 9.41±0.56vs. control: 9.66±0.47), 20m speed (experimental: 2.27±0.04 vs. control: 2.28±0.07), Hamstring-to-quadriceps torque ratios (experimental: 56.21±5.31 vs. control:56.9±5.16), average quadriceps power (experimental: 65.48±12.34versus control: 55.58±17.28), average hamstring power (experimental: 33.5±3.58vs. control: 26.89 ± 9.28), quadriceps peak torque (experimental: 242.41 ± 26.11 vs. control: 215.94 ± 45.95), and hamstring peak torque (experimental: 131.59 ± 15.98 vs. control: 123.58 ± 30.74) of the subjects (P≥0.05).
On the other hand, in the intra-group comparison and analysis of the means in the experimental group before and after post-activation potentiation protocol, there were significant differences between pre- post valuesin the vertical jump (pre: 58.80±11.05 vs. post: 65.70±11.54; P =0.001), Agility (pre:9.52±0.51 vs. post: 9.41±0.56; p= 0.001), Speed (pre:2.28±0.04vs. post: 2.27±0.04; p= 0.001), Hamstring-to-quadriceps torque ratios (pre:51.15±5.10vs. post: 56.21±5.31; p = 0.001), Quadriceps peak torque (pre:56.18±10.90vs. Post: 65.48±12.34; p = 0.003), Hamstring peak torque (pre:27.80±5.22 vs. post: 33.53±5.58; p = 0.002), Quadriceps peak torque(pre:242.26±41.11 vs. Post: 215.33±28.90; p = 0.004), and Hamstring peak torque (pre:111.42±10.47 vs. Post: 131.59±15.98 ; p = 0.001) of subjects in experimental group.
Discussion & Conclusion: The results of this study indicate that this specific Post-activation potentiation method was effective for improving vertical jump, 20 m speed performance, agility, Hamstring-to-quadriceps torque ratios, peak torque of quadriceps and hamstring muscles in experimental group athletes. (P≤0.05). Therefore, it can be used as a special warm-up method before the main performance of soccer players, both in training and in football matches.
