earticle

영어

This study aimed to identify the influence of high-heeled shoes on activation patterns (muscle activity and onset time) of leg muscles during body perturbation in healthy young females. Thirty-one healthy females in their 20s were recruited for this study. Subjects underwent two experimental conditions: (1) barefoot, and (2) wearing high-heeled shoes with a 7-cm heel height. And then forward and backward body perturbation impacts were randomly applied in each condition while subjects stand on perturbation board. Electromyographic measurements were performed on gastrocnemius (GCM), hamstring (HAM), and erector spinae (ES) for the forward perturbation, and tibialis anterior (TA), quadriceps (QAUAD), and rectus abdominis (RA) for the backward perturbation. During the forward perturbation, there were found for significant differences in the onset time among GCM, HAM, and ES for both conditions (p<0.05), suggesting differences between GCM and HAM and between GCM and ES for the barefoot condition, and between GCM and HAM for the high-heeled shoes condition. Muscle activities showed significant differences in both conditions (p<0.05), indicating differences between GCM and HAM and between GCM and ES for both conditions. Furthermore, during the backward perturbation, the onset time of muscle activity was significantly different among TA, QUAD, and RA in the barefoot condition (p<0.05), suggesting a difference between TA and QUAD. Muscle activities appeared to be significantly different between the muscles for both conditions (p<0.05), indicating differences between TA and QUAD and between QUAD and TA for the both condition.These findings indicate that wearing high-heeled shoes leads to changes for recruitment pattern of leg muscles, indicating alterations of ankle strategy to maintain balance during body perturbation.