Effects Of Attention Control Ability On Biomechanical Performance Of Side-step Cutting Action Under Different Intervention Tasks

Purposes:Side-step cutting action needs to identify and track visual objects and shift attention to action control.Attention-control ability plays an important role in the completion of side-step cutting action.In this paper,we studied the kinematics,dynamics and muscle activation strategies of the side-step cutting action of high and low attention-control ability population during different intervention(PP&S-UN&C-UN),and explored the influence of intervention mode and the difference of attention-control ability on biomechanical performance.The causes of the high injury rate of the side-step cutting action and whether different attention control ability can affect the performance of the athletes are discussed in order to provide scientific basis for the prevention of ACL injury and the selection of sports material.Methods:50 subjects were screened for 15 high and low attention control groups(HAC&LAC)with Stroop task.Under the intervention task,the side-step cutting action of the running speed of 3.5±0.5m/s to the two directions was completed.The kinematics and dynamics of the right leg support stage were simultaneously collected by Vicon motion capture system,Kistler three-dimensional force plate and surface electromyograph.Statistical analysis of characteristic parameters was performed using Two-way repeated measurement ANOVA.Results:(1)As the intervention difficulty increases,the AP-GRF peak increases.Compared with the PP intervention,the time to reach the V-GRF peak is earlier in the UN intervention,and the hip and knee flexion angles increase,the knee and ankle flexion angular velocity increases and the side-step cutting completion time increases;(2)The HAC group increases the ankle joint flexion angle at the moment of landing;Compared with the LAC group,the flexion angle of the hip and knee joints and the flexion angle of the knee and ankle joints increased,and the V-GRF peak,ML-GRF peak,and AP-GRF peak decreased;(3)In the pre-activation phase,the HAC group mainly increases muscle contraction in the anterior thigh group;At the landing stage,the activation of the VM,RF,and TA was greater than that of PP intervention during UN intervention.The activation of the MG and LG was reduced,and the VL of the HAC group were activated.At the stage of extension,the activation of knee and ankle joints was greater than that of PP intervention during UN intervention.The RF and LG activation of HAC group was greater than that of LAC group.Conclusions:(1)Note that the difference in attention-control ability is an important factor affecting the performance of the side-step cutting action.The HAC group has better buffer performance and dynamic stability maintenance,so the risk of injury is reduced when the side-step cutting action is completed;(2)Compared with PP,the risk of injury in the side-step cutting action is increased in UN,and the HAC group increases the joint activation mode by adjusting the muscle activation mode;(3)Regardless of the high and low attention-control ability population,in the UN,the completion of the side-step cutting action needs to mobilize more muscles of the lower limbs to increase the cushioning performance,and the activity completion efficiency is lower than the PP.