Effects Of Different Blood Flow Restriction Training Programs On Lower Limb Function Of Athletes With Knee Joint Injury

Objective: This thesis investigates the effects of different blood flow restriction protocols(continuous compression and intermittent compression)on lower extremity function in athletes with knee injuries,compares their rehabilitation efficacy,and provides a basis for developing rehabilitation training programs for patients after knee injuries.Methods: Twenty athletes who met the inclusion criteria of this study and were diagnosed with knee injury were selected as the research subjects.Subjects were randomly divided into two groups: group A(continuous pressurization group,n=10)and group B(intermittent pressurization group,n=10).The two groups received different pressurization methods combined with routine rehabilitation training.The experiment lasted for 6 weeks with 18 times of training 3 times per week.The subjects’ thigh circumference(suprapatellar 5cm,10 cm,15cm),active position perception of the knee joint(45°,60°),knee flexor-extensor muscle strength and explosive power,Y-balance test,motor function,and International Knee Commission(IKDC)scores were assessed before and after intervention.The data obtained in this study were statistically analyzed using Excel 19.0 and IBM SPSS 25.0.Shapiro-Wilk analysis was used to test the normality.The indicators of the two groups of subjects before and after intervention were compared within and between groups.Paired sample t-test or Wilcoxon analysis method was used to test the significance of intra-group differences,and independent sample t-test or Mann-Whitney U analysis method was used to test the significance of inter-group differences.The significance level was α=0.05,and P<0.05 was considered statistically significant.Results:1.Comparison between groups before intervention: The differences in thigh circumference(suprapatellar 5cm,10 cm,15cm),active position perception of the knee joint(45°,60°),knee flexor-extensor muscle strength and explosive power,Y-balance test,motor function,and International Knee Commission(IKDC)scores of subjects in both groups before intervention were not statistically significant(P >0.05).2.Intra-group comparison before and after intervention: The thigh circumference(suprapatellar 5cm,10 cm,15cm),active position perception of the knee joint(45°,60°),knee flexor-extensor muscle strength and explosive power,Y-balance test,motor function,and International Knee Commission(IKDC)scores of subjects in both groups improved significantly after intervention compared with those before intervention,and the differences were statistically significant(P<0.05);In group A,the difference in active position perception of the knee joint(45°)was significantly improved compared with that before the intervention,and the difference was statistically significant(P<0.05),the difference in active position perception of the knee joint(60°)was not statistically significant(P>0.05);in group B,the difference in active position perception of the knee joint(45°,60°)was significantly improved compared with that before the intervention,and the difference was statistically significant(P<0.05).3.Comparison between groups after intervention: The differences in thigh circumference(suprapatellar 5cm,10 cm,15cm),active position perception of the knee joint(45°,60°),knee flexor-extensor muscle strength and explosive power,Y-balance test,motor function,and International Knee Commission(IKDC)scores of subjects in both groups before intervention were not statistically significant(P>0.05).Conclusion:1.Both continuous compression and intermittent compression blood flow restriction training can effectively improve the thigh circumference of athletes with knee joint injuries,active position perception of the knee joint,knee flexor-extensor muscle strength and explosive power,Y-balance performance,motor function,and International Knee Committee(IKDC)scores;2.Both compression methods can effectively improve the proprioception of athletes with knee joint injuries,and 45° active position perception is better than 60°active position perception;3.The 6-week blood flow restriction training can significantly improve the lower limb function of athletes with knee joint injuries,and blood flow restriction training with different compression methods has no significant difference in the improvement of various motor functions.