Intervention Effects Of Different Rehabilitation Training Methods On Knee Joint Stability Of Female Football Players After Injury

Objective:Due to the sports characteristics of strong confrontation and fierce competition in football,female football players are prone to knee injury in the competition and training process,including patella injury,ligament injury,tendon injury,meniscus injury,muscle strain and so on,which often reduces the stability of the knee joint.Muscle strength training is the basis for maintaining joint stability.On the other hand,some scholars have proposed that strengthening the muscle strength of knee joint can indirectly enhance proprioceptive function.In view of the important role played by the quadriceps,hamstrings and proprioception in knee movement,the current rehabilitation training for female football players with knee instability after injury is mainly the muscle strength training of the quadriceps and hamstrings.However,high intensity resistance training(HI-RT)has a certain risk of injury and limited application due to high load.Recent studies have found that low intensity resistance training combined with blood flow restriction(BFR)applied to musculoskeletal rehabilitation of athletes can achieve the training effect of high intensity load training under low intensity load.Based on this,this study aims to compare HI-RT training with BFR training,and explore the effects of the two different rehabilitation training methods on muscle strength,volume,proprioception and other aspects of female athletes with knee instability after injury,in an attempt to explore the effectiveness of the two rehabilitation training methods in improving knee stability of female football players.Methods:A total of 54 female football players who met the research criteria were screened out and randomly divided into blank control(CON)group,HI-RT training group and BFR training group :(1)Female football players in CON group maintained normal living habits and did not receive intervention;(2)HI-RT group received conventional high-intensity muscle strength training program 3 times a week for 8 weeks,including high-intensity resistance training of quads and hamstrings at 70% 1RM;(3)The BFR group received a BFR rehabilitation program 3 times a week for 8 weeks,including quadriceps and hamstring BFR training at 30% 1RM at 60% arterial occlusion pressure.Lysholm score scale and IKDC score scale were used to evaluate knee function of the three groups before and after intervention.The strength and volume of the quadriceps femoris and hamstring muscles in the three groups before and after intervention were assessed by Iso Med 2000 isokinetic muscle strength test and Logiq Book XP color Doppler ultrasound,respectively.The position perception of the three groups before and after intervention was measured by the isokinetic muscle strength test system.The balance ability of the three groups before and after intervention was tested using the Biodex balance test system and Y balance.SPSS 24.0 was used to calculate the data of the three groups before and after intervention.T-test and one-way analysis of variance were used to compare the changes in various indicators,and P <0.05 was considered as significant difference.Results:(1)After 8 weeks of intervention,Lysholm scores and IKDC scores of subjects in the BFR group and the HI-RT group were significantly increased compared with before intervention(P < 0.05);BFR group and HI-RT group had significant difference compared with CON group(P < 0.05).There was no significant difference between the BFR group and the HI-RT group(P > 0.05).(2)After 8 weeks of intervention,muscle thickness and relative peak torque of rectus femoris,vastus intermedius and biceps femoris in BFR group and HI-RT group were significantly increased compared with before intervention(P < 0.05);BFR group and HI-RT group had significant difference compared with CON group(P <0.05).There was no significant difference between the BFR group and the HI-RT group(P > 0.05).(3)After 8 weeks of intervention,there was no significant difference in joint position perception between BFR group and HI-RT group compared with before intervention(P > 0.05).There was no significant difference between the BFR group and the HI-RT group and the CON group(P > 0.05).(4)After 8 weeks of intervention,the stability of open eye posture,stability of closed eye posture,stability limit and Y balance score in BFR and HI-RT groups were improved compared with those before intervention(P < 0.05),and there were significant differences between BFR and HI-RT group and CON group(P < 0.05).There was no significant difference between the BFR group and the HI-RT group(P >0.05).Conclusion:(1)Both 8-week BFR training and routine HI-RT training can significantly improve the knee joint stability of female college football players,mainly reflected in the improvement of knee joint function,muscle strength and volume,postural stability and balance ability.(2)Eight weeks of BFR training had a similar effect on muscle strength and volume as the HI-RT training,but the BFR regimen had an earlier increase in volume than the HI-RT training.(3)The 8-week BFR training and HI-RT training did not significantly improve the position sense of knee proprioception,and the improvement in other aspects still needs to be discussed.(4)The 8-week BFR regimen and HI-RT training significantly improved the postural stability and balance ability of the knee joint,and the increase of eye closing postural stability in the BFR group was greater than that in the HI-RT group.