The effects of multidirectional soccer-specific fatigue on neuromascular risk factors of ACL injury after the jump-landing in various direction
Oral Presentation XML
1guilan university
2Department of Physical Education and Sport Sciences, University of Guilan, Rasht, Iran
Introduction: The purpose of present study was to investigate the effects of multidirectional soccer-specific fatigue on neuromascular risk factors of ACL injury after the landing in various direction.
Methodology: Following a semi-experimental method with non-random target sampling, 16 soccer players were divided into SAFT90 group (21.00±1.92 years, height 180.87±5.71 cm, weights 74.50±6.90 kg, body mass 22.72±1.39 kg) and control group (21.00±2.07 years, height 180.00±4, weight 72.62±4.89 kg, body mass 22.42±1.17 kg). After doing the maximum voluntary contraction test, the subjects performed a single-leg jump-landing test in three directions. The muscle activity was recorded and evaluated by ME6000 electromyography. Two-way variance analysis followed by Bonferroni test was used to analyze and compare the data. In order to examine the significance of descriptive data, Independent T-test was also used through SPSS software version 20 (p<0.05).
Results: The activity of vastus lateralis (P=0.031) and vastus medialis (P=0.023) muscles in SAFT90 group reduced significantly. In addition, significant difference in the activity of biceps femoris muscle was observed for within and between group factor (P=0.0004), while no significant difference in the neuromuscular activity of semitendinosus and rectus femoris muscle were observed. No significant difference in the ratio of quadriceps to hamstrings was observed as well. However, only semitendinosus muscle showed a significant increase in diagonal direction compared with other directions in the post-test of SAFT90.
Discussion: In the current study, biceps femoris muscle activity increased significantly in SAFT90 group and it probably intensifies the dynamic valgus and contributes to ACL injury eventually. On the other hand, due to a significant increase in the semitendinosus muscle in the diagonal direction compared to other directions in the SAFT90 group, it is difficult to rationalize the effects of direction on ACL injury increase and this issue needs further research to clarify whether the direction of jump-land leads to non-contact injuries in soccer player or not. Therefore, in order to reduce the rate of injuries and exercise rehabilitation, athletic trainers and exercise designers should pay attention to the specific neuromuscular exercises based on particular movement patterns.