Research On The Effect Of BFR Training On The Shoulder Joint Function Of College Students With Rotator Cuff Injury In Overhead Throwing Sports

Objective: In order to withstand the high-speed angular velocity and torque generated when serving or spiking,the overhead throwing sports requires high muscle strength on the internal and external rotator muscles of the shoulder joint.In this type of sports,college athletes can easily cause chronic rotator cuff injuries due to incorrect force-generating movement patterns and repeated overuse of the shoulder joint,which affects the normal functioning of the shoulder joint.At present,the focus of training in the functional rehabilitation of rotator cuff injury in this group is to improve the internal and external rotator muscle strength of the shoulder joint,but at this stage,the use of high-load resistance training methods may cause shoulder joint pain again.In recent years,studies have confirmed that low-load resistance combined with blood flow restriction training methods can achieve similar effects as high-load resistance.Therefore,this study exploratively compared blood flow restriction training with traditional resistance training,and explored the effect of blood flow restriction training on the internal and external rotator muscle strength,range of motion,shoulder joint and shoulder joint of college athletes with overhead throwing rotator cuff injury.In order to provide more scientific and effective rehabilitation training methods for the treatment of college athletes and sports people with rotator cuff injuries in this type of project.Methods:Sixty-six college students with rotator cuff injury who met the inclusion criteria were selected and randomly divided into the BFR training group,the traditional training group,and the blank group,with 22 cases in each group.Finally,40 subjects completed a 6-week training program.Among them,the BFR training group trains 3 times a week,including warm-up exercises,correction of biomechanical abnormalities training,scapula stability training and BFR shoulder joint functional training;the traditional training group trains 3 times a week,including warm-up exercises,correction of biomechanical abnormalities training,scapula stability training and traditional resistance shoulder joint functional training;the blank group keeps the original living habits.Evaluation indicators: Before the intervention and 6 weeks after the intervention,the isokinetic muscle strength test was used to evaluate the muscle strength of the external and internal rotators;micro FET3 to evaluate the range of joint motion;the visual analogue scale（VAS）to evaluate the degree of pain;the UCLA scale and The shoulder function evaluation scale assesses the function of the shoulder joint.SPSS 23.0 was used to process the obtained data,and the statistical significance level was set at P<0.05.Results:（1）In the end,a total of 40 subjects completed the study,16 in the BFR training group,12 in the traditional training group and the blank group.The baseline comparison of subjects in the three groups before the intervention,the difference was not statistically significant（P>0.05）;（2）Muscle strength assessment:（1）The peak torque and average power of external and internal rotation in the BFR training group were increased compared with before the intervention,and the difference was statistically significant（P<0.05）;the peak torques of external rotation and internal rotation in the traditional training group were not significantly different from those before intervention（P>0.05）,and the average power of external rotation and internal rotation was significantly different from those before intervention（P<0.05）.The peak torque and average power of internal rotation were not significantly different from those before intervention（P>0.05）;（2）The peak torque and average power of external rotation and internal rotation of the BFR training group were significantly higher than those of the traditional training group and the blank group.The difference was obviously statistically significant（P<0.05）.（3）Evaluation of joint range of motion:（1）The ROM of flexion,extension,abduction,external rotation and internal rotation in the BFR training group were improved compared with those before the intervention,and the difference was statistically significant（P<0.05）;The ROM of all directions in the traditional training group was improved compared with that before the intervention,and the difference was statistically significant（P<0.05）;the ROM of all directions in the blank group was not statistically significant than that before the intervention（P>0.05）.（2）The BFR training group’s ROM of flexion,extension,and internal rotation were improved compared with the traditional training group,and the difference was statistically significant（P<0.05）.Compared with the traditional training group,the ROM of abduction and external rotation was not statistically significant（P>0.05）;Compared with the blank group,the ROM of flexion,extension,external rotation and internal rotation in the BFR training group was statistically significant（P<0.05）,and the abduction ROM was not statistically significant compared with the blank group（P>0.05）;Only the internal rotation ROM in the traditional training group was statistically significant compared with the blank group（P<0.01）.（4）Assessment of shoulder joint pain（VAS score）:（1）The VAS score of the BFR training group was lower than before the intervention,and the difference was significantly statistically significant（P<0.01）;the traditional training group and the blank group had no statistics on the VAS scores than before the intervention Academic significance（P>0.05）.（2）The reduction of VAS score in the BFR training group was more significant than that of the traditional training group and the blank group,and the difference was statistically significant（P<0.01）.（5）Evaluation of shoulder joint function:（1）The scores of UCLA scale and Shoulder Function Evaluation Scale in the BFR training group were higher than before the intervention,and the difference was statistically significant（P<0.01）;the traditional training group UCLA scale score and shoulder function The functional scale score improved compared with that before the intervention,and the difference was statistically significant（P<0.05）;The blank group was not statistically significant than before the intervention（P>0.05）.（2）The UCLA scale scores and shoulder function scale scores in the BFR training group changed more significantly than those in the traditional training group and the blank group,and the difference was significantly statistically significant（P<0.01）.Conclusion:（1）Compared with the traditional training program,the 6-week BFR training program can significantly and effectively improve the external rotation and internal rotation of the shoulder joint of the throwing or overhead sports RTC college athletes,increase the range of joint activities,and improve shoulder joint function.（2）BFR training（30% 1RM,40% AOP）can not only increase muscle strength,but also significantly reduces pain after resistance training.