A Study On The Effect Of Compound Training On The Symmetry And Change Of Direction Ability Of Single-leg Squat Jump Of College Students Majoring In Footbal

Objective: Improving the football level of colleges and universities is an essential path for the development of football projects.Conducting scientific research on football training can enrich football training theory and offer new ideas to enhance football performance.Football is a sport that typically involves unilateral competition,resulting in asymmetry between the lower limbs.However,excessive asymmetry can negatively impact the accuracy and efficiency of specific motor skills,which can ultimately hinder athletic performance and increase the risk of injury.Hence,it is crucial to acknowledge the asymmetry between the lower limbs in football.This requires the implementation of effective monitoring and detection techniques,as well as targeted training interventions.Such measures are instrumental in promoting the scientific and precise development of football training theory.Methods: The research methods employed in this study include a comprehensive literature review,experimentation,mathematical statistics,and logical analysis.After conducting a thorough literature review,we have identified six evaluation indicators for assessing limb symmetry and directional ability.Additionally,we have determined six test indicators that will be used to measure these factors.These were chosen based on the framework of single and bilateral composite training,as established by previous studies.Training interventions were implemented to improve the symmetry indicators of the single leg squat jump.The study selected 26 football specialized students from the Sports Training College of Tianjin Institute of Physical Education as test subjects.The experimental group(n=13)underwent unilateral composite training for eight weeks,while the control group(n=13)received bilateral composite training for the same duration.The test results were analyzed through paired sample T-tests within the group and independent sample T-tests between the groups following the experiment.Additionally,the Pearson correlation tests were utilized to examine the relationship between symmetry and directional ability in single leg squat jumping.This subject paper aims to analyze the mechanisms and influencing factors of two intervention methods and their impact on changes in limb symmetry and directional ability.This study aims to uncover the asymmetric traits of lower limb asymmetry in football players,and investigate the relationship between limb symmetry and directional ability in sports.Conclusions:(1)The study utilized three stages of resistance training with different percentages of one-rep maximum(1RM)-60%,85-100%,and 75-85%-to enhance the performance of single-leg squat jump and football direction change test.Results showed that unilateral composite resistance training was more effective in developing unilateral explosive power and improving performance compared to bilateral training.(2)There is evidence of inter-limb asymmetry in the lower limbs of soccer players,particularly in the areas of squatting and jumping on one leg.However,unilateral compound training has been shown to effectively reduce this asymmetry and enhance the single-leg explosiveness of soccer students.(3)The study found that one-sided composite training was more effective than bilateral composite training in improving repeated impact ability,lateral movement ability,and short-distance straight sprint ability in the direction change test.Additionally,both single-sided composite training methods were effective in improving the 180°side shear direction ability,which suggests that training specificity plays a role in the effectiveness of these methods.(4)As horizontal speed increases,so does the level of horizontal lower limb symmetry.However,there is no correlation between the vertical lower limb asymmetry and horizontal speed.