Effects Of Kaatsu Combined With Low Intensity Resistance Training On Balance And Peri-ankle Muscle Strength In Patients With Functional Ankle Instability

Objective:To compare the difference of intervention effects of 6-week blood flow restriction combined with low-intensity resistance training(LI-BFR)and low-intensity resistance training(LI-RE)on peri-ankle muscle strength and static and dynamic balance of functional ankle instability(FAI),and explore the training effects of LI-BFR on peri-ankle muscle strength and balance of FAI.It provides experimental basis and theoretical support for applying pressure training to FAI sports rehabilitation.Methods:In this study,a total of 28 patients with functional ankle instability who met the experimental requirements were selected and divided into LI-RE group and LIBFR group by random number table method.The LI-RE group received low-intensity resistance training of the muscle strength around the ankle with elastic band,and the LIBFR group received pressure constant blood flow restriction intervention on the basis of this.The intervention training of subjects in both groups lasted for 6 weeks,3 times a week,and each training lasted for 40 minutes.Before and after the training,the Peak Torque(PT),Peak Torque/Weight(PT/W),Average Power(AP),Average Power/Weight(AP/W),and Total Work(TW)of FAI affected ankle during internal and external ankle inversion and plantar dorsiflexion were tested using CON-TREX isometric muscle strength tester.The static and dynamic balance abilities of lower limbs were tested using the Pro-kin test system and Y-Balance device.All statistical data were summarized in EXCEL and processed using SPSS26.0 statistical software.The two-way repeated-measures analysis of variance(ANOVA)was used to test the main effects of group and intervention,as well as the interaction effect between group(LI-RE group,LI-BFR group)and intervention time(pre-test,post-test).When the interaction effect was statistically significant,simple effect analysis was conducted on the interaction effect All parameters were expressed as mean±standard deviation(X±SD),and the test level was defined as 0.05.Results:1.Ankle dorsiflexion,plantar flexion isokinetic strength:After intervention training.the relative peak torque of 60°/s dorsiflexion,plantar flexion and plantar flexion of FAI subjects in LI-RE group and LI-BFR group was statistically different from that before intervention(p<0.05).but there was no significant difference between groups(p>0.05).Compared with before intervention,the relative mean power of 180°/s plantar flexion in LI-BFR group was significantly different(p<0.05).There was no significant difference in total work of ankle dorsiflexion and plantar flexion in 180°/s concentric and eccentric mode between the two groups of FAI subjects(p>0.05).2.Ankle varus,valgus isokinetic strength:After intervention,the indexes of 60°/s valgus concentric and valgus eccentric relative peak moment of LI-RE group and LIBFR group were statistically significant compared with those before intervention(p<0.05).Compared with LI-RE group.the relative mean power difference of 180°/s varying-eccentric before and after intervention in LI-BFR group was different(p<0.05).The total work of ankle joint inversion and eversion at 180° s in concentric and eccentric modes did not differ significantly between the two groups of FAI subjects(p>0.05).3.Static balance ability:After 6 weeks of intervention training.the exercise length index of LI-BFR group with eyes open and closed on both feet had significant differences compared with before intervention(p<0.05),and the functional standard deviation of left and right direction with eyes closed on both feet had significant differences compared with before intervention(p<0.05).There were significant differences in the average motion velocity of the right foot in the forward and backward direction and the elliptical area of the right foot in the closed eye state compared with before intervention(p<0.05).4.Dynamic balance capacity:After intervention training,the three indexes of dynamic balance test in LI-RE group and LI-BFR group were higher than before intervention,with significant differences(p<0.05).The interaction between group and intervention training on the forward indexes of Y balance test in LI-RE group and LIBFR group was significant(p<0.05).Simple effect results showed that the forward index of Y balance test in LI-BFR group was significantly different from that before intervention(p<0.05).Conclusions:1.Blood flow restriction combined with low-intensity resistance training improved maximum strength and rapid strength of the dorsal ankle,plantar-flexion and varus on the affected side of functional ankle instability,but had no effect on strength endurance in the four motion directions.2.Blood flow restriction combined with low-intensity resistance training can improve the static and dynamic balance ability of lower limbs with functional ankle instability,especially the dynamic balance ability in the forward direction of the right foot with single-leg support.3.Compared with low intensity resistance training,the blood flow restriction training group has a better intervention effect on the muscle strength and balance ability of functional ankle instability patients,indicating that the pressure training combined with low-intensity resistance can be used as a means of exercise rehabilitation for functional ankle instability patients.