| Research Purpose: Badminton overhead landing action is prone to injury,so the right insole may prevent injury.In this study,a shoe insole was functional to verify the effect of the functional insole on the bio-mechanical characteristics of the lower limbs and the possible effects based on the finish of the badminton overhead ball landing of the badminton specialized students.Research Method: Recruiting 19 male badminton specialized students from Guangzhou Sport University,23±1.47 years old,weight 69.48±8.51 kg,height176.21±4.74 cm,ball age 7.47±3.50 years,shoe size(EUR)about 42.40±1.05.The participants completed two badminton overhead ball movement tests by wearing ordinary insoles and functional insoles respectively,with at least five repetitions of each movement and at least five minutes resting between two times to eliminate differences of physical function.Simultaneous kinematic,kinetic and EMG data were collected using the Vicon motion capture system,AMTI dynamometer,and Delsys surface EMG,and an insole perception questionnaire was completed after each test.The primary data were imported into Visual3 D for musculoskeletal modeling,filtering and computational analysis,and into SPSS 25.0 for paired-sample T-test analysis.Research Results:1)Compared to the ordinary insoles,the functional insoles significantly reduced the vertical ground reaction force(2.94±0.44 vs.3.05±0.43 body weight multiplier(BW))(P=0.038)and reduced the maximum vertical loading rate(82.99±27.06 vs.75.16±23.81 BW/s)(P=0.024).2)Compared to the ordinary insoles,the functional insoles significantly reduced the maximum hip flexion angle(37.58±20.35 vs.35.17±21.39°)(P=0.047),the maximum hip abduction angle(33.56±8.60 vs.31.66±8.51°)(P=0.006)(P=0.006),the knee ROM(22.14±5.30 vs.19.63±5.89°)(P<0.001),reduced maximum ankle inversion angle(36.76±5.33 vs.35.40±5.01°)(P=0.02).3)Compared to the ordinary insoles,the functional insoles significantly reduced the maximum hip flexion velocity(361.79±111.24 vs.125.77±81.62 rad/s)(P<0.001),reduced the maximum hip extension velocity(-249.19±73.56 vs.-162.65±93.96 rad/s)(P=0.007),reduced the maximum hip inversion velocity(-329.38±85.89 vs.-239.18±65.99 rad/s)(P=0.001),reduced maximum knee extension velocity(413.08±85.75 vs.163.23±53.66 rad/s)(P<0.001),reduced maximum knee flexion velocity(-606.78±86.41 vs.-192.13±83.66 rad/s)(P<0.001).The maximum hip and knee flexion and extension accelerations were significantly reduced,and the maximum ankle dorsiflexion and plantar flexion accelerations were significantly reduced.4)Compared to the ordinary insoles,the functional insoles significantly reduced the maximum hip extension force(-0.95±0.32 vs.-0.85±0.29 BW)(P=0.005),the maximum hip internal rotation moment(-0.35±0.11 vs.-0.30±0.11 Nm/kg)(P=0.008),and the maximum knee external rotation force(-2.94±0.4 vs.2.76±0.34 BW)(P=0.007).5)Compared with the ordinary insoles,the functional insoles significantly reduced tibialis anterior muscle activation(61.78±53.43 vs.44.94±30.99μV)(P=0.049),increased subjective perceived mid-forefoot shock absorption scores(3.21±0.42 vs.3.89±0.66)(P<0.001),increased support scores(3.63±0.76 vs.4.16± 0.5)(P=0.008).Research Conclusions:1)The insole is functional to be embedded with ACF material to effectively absorb the impact force,weaken the sudden change of knee angle,make the knee more stable during landing,and reduce the probability of knee injury.The angle of ankle pronation is changed and tibialis anterior muscle is activated to reduce foot valgus and the risk of ankle sprain.2)The functional insole make the medial femoral muscle dominant force,the support leg close to the body’s central axis,to enhance the pedaling force to a certain extent,improving the back-movement performance of the wearer.3)The functional insole is equipped with excellent forefoot shock absorption and arch support to improve the acceptability of wearing. |
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