고관절 굽힘과 위치에 따른 스텝 업 동작 시 하지 근육의 근활성도에 미치는 영향

Abstract

The purpose of this study is to provide basic data on the prevention of knee pain by suggesting correct functional movements by comparing and analyzing muscle activity of leg muscles during step-up according to hip flexion and adduction, neutral, abduction. 10 healthy adults were selected for the subject and step-up was performed randomly in three directions from one angle by setting three hip joint angles (45°, 70°, 90°) and three hip joint directions (adduction, neutral, abduction). The muscle activity was measured by attaching electromyographic electrodes to the muscle tensor fasciae latae, muscle gluteus medius, muscle vastus medialis, and muscle vastus lateralis using WEMG – 8. One-way ANOVA was used to compare muscle activity between step-ups according to hip joint angle and direction. As a result, the following conclusions were obtained.

A. Muscle tensor fasciae latae showed a significant increase in muscle activity at the 45° hip angle in adduction than abduction (p<.05).

B. Muscle vastus medialis showed a significant increase in muscle activity when the hip direction was neutral and the hip angle was 90° compared to the hip angle at 45° (p<.05). When the hip direction was abduction and the hip angle was 90°, muscle activity was significantly increased compared to 45° and 70° hip angles (p<.05). Muscle vastus medialis showed no significant difference in muscle activity depending on the hip direction (p>.05).

C. Muscle vastus lateralis showed no significant difference in muscle activity depending on hip angle and direction (p>.05).

D. Muscle gluteus medius showed no significant difference in muscle activity depending on hip angle and direction(p>.05).

According to the results, the step-up with neutral and abduction direction of hip and increased hip angle is suggested for correct functioning and knee pain prevention in order to reduce muscle activity of muscle tensor fasciae latae and muscle vastus lateralis while increasing the muscle activity of muscle vastus medialis and muscle gluteus medius for step-up. In addition, systematic research should be conducted in the future using various subjects and variables.