Influence of functional ankle instability on balance and lower limb explosive power
ZHUANG Changhong
WANG Yufeng
HE Sijie
JIANG Tao
YE Jintao
ZHANG Tianfeng
Abstract：Objective To observe the influence of functional ankle instability(FAI)on balance and lower limb explosive power.
Methods A total of 26 male FAI participants,13 bilateral(bilateral group)and 13 left(left group),who regularly en-gaged in high-intensity exercise,were recruited at Harbin Sport University in May,2024.Meanwhile,13 unin-jured male participants who engaged in high-intensity exercise were recruited as control group.They were mea-sured the moving area of the left foot,right foot and body center of gravity standing on feet with the eyes opened and closed;as well as the sway angle,confidence ellipse diameter(maximum and minimum)to circle area ratio,sway ratio and confidence ellipse standing on single foot,with Gaitview plantar pressure analysis system.They were also tested with Y-balance test(YBT),and were measured flight time and center of gravity height during jumps single leg left/right drift,stiffness and counter movement jump using Opto-jump Optical Measurement of Motor Quality.
Results There were significant differences among the groups in swing angle,confidence ellipse diameter(maximum and minimum)to circle area ratio,swing ratio and confidence ellipse as left-leg stance with eyes closed(F>3.300,P<0.05),which was the least in the control group(P<0.05).Swing angle,swing ratio and confidence ellipse were also different among the groups as right-leg stance with eyes closed(F>4.404,P<0.05),and they were less in the control group than in the bilateral group(P<0.05),and less in the left group than in the bilateral group(P<0.05),except swing angle.There was a significant difference in YBT results(F>3.649,P<0.05),which was the least in the bilateral group(P<0.05).There were significant differences in the flight time and center of gravity height during counter movement jump(F>7.458,P<0.01),which was the least in the bilateral group(P<0.05).
Conclusion FAI may impair the static balance as single-leg stance with eyes closed,dynamic balance and lower limb ex-plosive power.
Keywords：functional ankle instabilitybalancelower limb explosive power
Publication Date：2024-09-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1107-1116 )