Muscles Balance Effects on Enhancing Physical Performance in High School Soccer Players

Mohammad Alhindawi


Background: Exercise program have been introduced to reduce muscle imbalance. Methods: 22 male soccer
players, 14 to 16years of age, volunteered for the stud with a mean age of 15.3 ± 1.32 years; mean height, 172.16
± 1.00 cm; mean weight, 60.79 ± 11.34 kg; were studied to examine muscle imbalance differences between
quadriceps and hamstring strength using Biodex Pro Isokinetic Device . Subjects were randomly assigned into
two groups to enhance muscle balance, group 1 ( resistance training group) participated in supervised program
about 60 minute exercise sessions 3 times a week for period of 11 week. The supervised exercise session
included strength training for both hamstring and quadriceps. The training program consisted of three parts –a 5
minutes worm-up, 50 minutes the resistance training and a last part is 5 minutes cool-down and stretching
exercises. The target exercise intensity was progress from 70%-90 of 1Rm. Group 2 (control group) subjects
were instructed not to change their normal training routine. Results: Both legs of 22soccer players were
evaluated after the completion of the strength training. Experimental group increased their hamstring muscle
strength significantly and reduced the H: Q ratio. Muscle strength was significantly greater for the experimental
group (P = .005) it increased by 50.2% for the right leg and by 49.9 for the left leg. And muscle balance
improved from 49.2 to 85.7 for the right leg and from 52.2 to 86.3 for the left leg than for the control group, with
increasing strength significant in both quadriceps and hamstring muscle for soccer players (P < .005).
Experimental group demonstrated a greater percentage increase in hamstring strength compared with control
group. Experimental group had significantly greater quadriceps-to-hamstring ratio when compared with control
group (P < .005). The results also revealed that speed, agility and kicking were all improve with statistical
significant after reduced H: Q ratio. Speed improved by 8.4%, agilities improved by 6.1% and kicking distances
by 22.2%, shuttle run by 7.6% and kicking on target by 62.5%. Strength training program based on reducing
muscle imbalance well effect performance on high school Soccer players. Conclusion: Soccer players increase
their quadriceps strength greater than their hamstring strength, which will lead to increase muscle imbalance
putting them at risk for anterior cruciate ligament injury and reduce their physical performance a. Strength
programs training based on improving dynamic control of the knee muscles by emphasizing hamstring
strengthening should be instituted for young soccer players.


Muscles balance, Muscles imbalance, physical Performance.


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