Effects Of Dual-task Training On Postural Control In College Students With Functional Ankle Instabilit

Ankle sprain is a common injury in daily life and sports activities,often occurs in young people with sports experience.If the ankle sprain does not seek effective treatment in time after the first sprain,the chance of ankle sprain again will be greatly increased,and it will develop into functional ankle instability over time.Studies have shown that decreased postural control is the most representative functional defect in people with functional ankle instability.After rehabilitation training,most people with functional ankle instability still face the problem of decreased postural control after returning to daily life and sports activities,which greatly increases the risk of ankle re-injury.In life and sports,individuals often need to perform multiple tasks at the same time,such as communicating while walking,paying attention to the opponent’s position while passing the ball,etc.Such simultaneous execution of multiple tasks will further aggravate the postural control defects of people with functional ankle instability,which seriously affects daily life and functional activities.Therefore,there is an urgent need to improve postural control during dual tasks in people with functional ankle instability.However,there are few studies on improving the postural control ability of people with functional ankle instability by dual-task training,and there are some shortcomings,such as too simple tasks and most of them are immediate studies.Therefore,this study combined existing research evidence to explore the effect of long-term challenging dual-task training on postural control in people with functional ankle instability.ObjectiveThe objective of this study was to observe the effect of 6-week dual-task training on postural control of college students with functional ankle instability.The conclusion of this study will enrich the theory of rehabilitation training methods and provide theoretical and practical basis for the prevention and treatment of ankle joint injury.In this study,24 college students with functional ankle instability were randomly divided into a single task group of 11(n=11)and a double task group of 13(n=13).n addition to conventional muscle strength training,the single-task group received single-task training(balance training and functional training),and the double-task group received dual-task training(balance training and functional training while performing attention tasks).Each intervention lasted 45 minutes,5 times a week,for 6 weeks.Static and dynamic balance,muscle strength,proprioception,ankle function and dual-task cost were evaluated before and after the intervention.In static balance function,Pro-kin254 dynamic and static balance test system was used to measure the speed,length and ellipse area before and after and left and right directions.The dynamic balance function uses Pro-kin254 dynamic and static balance test system,Qualisys infrared high-speed motion capture system,Kistler three-dimensional force measuring table,Y-balance balance test system to measure the relevant indicators of dynamic balance ability.The Cybex isokinetic muscle strength test system was used to measure ankle plantar flexion,dorsiflexion,varus and valgus isokinetic muscle strength and ankle plantar flexion position perception.Ankle function was assessed using the Cumberland Ankle Instability Questionnaire(Cumberland,CAIT);dual task cost(DTC)is calculated based on the area of moving ellipse.Statistical processing: t test was used for the data of measurement data conforming to normal distribution,and rank sum test was used for the data not conforming to normal distribution.p<0.05 was considered statistically significant.Results(1)Static balance function: under the condition of single task,the exercise speed,exercise ellipse area and exercise length of the dual-task group after training were significantly decreased compared with that before intervention(p<0.05),and the exercise speed and exercise ellipse area of the dual-task group were statistically different between groups(p<0.05).Under the dual task condition,the exercise speed,elliptical area and length of the dual task group after training were significantly decreased compared with that before intervention(p<0.05),while the movement speed of the single task group before and after and in the left and right directions was statistically different(p<0.05),and the rest were not different(p>0.05).Comparison between groups After intervention,there were statistical differences in exercise speed,elliptical area and length between the two-task group and the single-task group(p<0.05).(2)Dynamic balance function: In the single task condition,the stability index in all directions,mean trajectory difference(ATE),before and after/around,overall dynamic stability coefficient of jump landing and Y-Balance test score of the dual task group after training were significantly decreased compared with that before intervention(p<0.05).Dual task group stability index is compared between groups,before and after the direction,the overall dynamic stability coefficient is significantly lower than the single task group(p<0.05);In the dual-task condition,the stability index in all directions,the mean trajectory difference(ATE),the front/back/left/right directions,and the overall dynamic stability coefficient of jumping landing in the dual-task group were significantly decreased compared with before intervention(p<0.05).Dual task group stability index is compared between groups,ATE,before and after the direction,the overall dynamic stability coefficient was significantly lower than the single task group(p<0.05).(3)Muscle strength: At 60°/s,the relative peak moments of varus and valgus and the relative peak moments of plantar flexion and dorsiflexion in the dual task group were significantly increased compared with before intervention(p<0.05).There were no statistical differences in the ratio of peak moment of varus/valgus and dorsiflexion/plantar flexion between the two groups compared with before intervention.At 180°/s,the relative peak moment of varus,valgus and plantar flexion in the single task group had statistical differences compared with before intervention(p>0.05),while the relative peak moment of dorsiflexion,the ratio of peak moment of varus/valgus and the ratio of peak moment of dorsiflexion/plantar flexion had no statistical differences compared with before intervention(p>0.05).The relative peak moment of varus,valgus,plantar flexion and dorsiflexion and the ratio of peak moment of varus/valgus in the dual task group were statistically different from those before intervention(p<0.05),while the ratio of peak moment of dorsiflexion/plantar flexion was not statistically different from that before intervention(p>0.05).The relative peak moment of valgus after intervention was significantly higher than that in single task group(p<0.05).(4)Proprioception: there was no statistical difference in the absolute error of position perception in the single-task group after training compared with that before intervention(p>0.05),while there was statistical difference in the absolute error of position perception in the dual-task group compared with that before intervention(p<0.05).(5)Ankle joint function: CAIT scale scores in both groups were significantly increased compared with before intervention(p<0.05);There was no statistical difference between the two groups before intervention(p>0.05).After intervention,the score of CAIT scale in the two-task group was significantly increased compared with that in the single-task group(p<0.05).(6)Dual task cost(DTC): The DTC value of exercise ellipse area in the dual task group was significantly decreased compared with before intervention,with statistical difference(p<0.05),while the DTC value of exercise ellipse area in the single task group was not statistically different compared with before intervention(p>0.05).Conclusion(1)6 weeks of single and dual task training can improve the static and dynamic balance ability,periankle muscle strength and proprioception of FAI subjects to varying degrees;(2)Compared with single task training,dual task training can effectively reduce the interference degree of individuals performing dual tasks and improve the postural control ability of FAI subjects performing dual tasks;(3)Dual-task training was superior to single-task group in improving the muscle endurance of ankle varus and valgus muscle groups and improving the muscle balance of ankle varus and valgus muscle groups in FAI population.