A060: The Influence of Off-Load Training on the Lower Limb StrengthAsymmetry of Tennis Students

<bold>Background:</bold> Many studies have shown that interlimb asymmetry is prevalent in various sports. As a highly reactive, one-sided sport, tennis has been shown to have significant left-right differences in grip strength and triceps strength in tennis players. However, playing tennis can also place an uneven mechanical load on the lower extremities. This left-right difference in mechanical load may also result in asymmetrical strength in the lower limbs. Therefore, early and effective interventions are needed to narrow the strength gap between the non-dominant and dominant legs. <bold>Methods:</bold> 21 male college tennis students were recruited and randomly divided into OS-ND group, OS-N group and TDL group, 7 in each group, and the intervention was carried out for 6-weeks. The lower limb strength indices were collected by the Isomed2000 isokinetic muscle strength testing system and Kistler three-dimensional force measuring table before and after the intervention. SPSS26.0 was used for statistical analysis of the difference between the observed data. <bold>Results:</bold> The relative peak torque and relative peak power flexion and extension of the left knee joint in the OS-ND group showed significant differences (P &lt; 0.01), similarly, the right knee joint in the OS-D group showed significant differences (P &lt; 0.01), and the left and right knee joint in the TDL group showed significant differences (P &lt; 0.05). The height and impulse of left leg before and after the OS-ND group were significantly different (P &lt; 0.05), and the relative peak power of left leg the OS-ND group were significantly different (P &lt; 0.01). In OS-N group, there were significant differences in the height and relative peak power of the right leg in the air (P &lt; 0.01), and there were significant differences in the take-off speed and impulse of the right leg (P &lt; 0.05). In TDL group, there were significant differences in the height of the left leg in the air (P &lt; 0.05), the relative peak power and take-off speed of the left and right leg before and after the jump (P &lt; 0.05), and the impulse of the right leg (P &lt; 0.05). <bold>Conclusion:</bold> Off-load training can improve the maximum strength and fast strength of the non-dominant leg of the lower extremity of the tennis students, and has a small improvement on the unloading side. It shows that it can be used as an auxiliary training to reduce the difference of strength and strength. However, the experiment did not track and monitor the process of muscle strength growth, which can be controlled by more refined indicators.