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츄음반타 ( Vantha Chhoeum ),왕창원 ( Changwon Wang ),장승완 ( Seungwan Jang ),민세동 ( Se Dong Min ),김영 ( Young Kim ),최민형 ( Min-hyung Choi ) 한국인터넷정보학회 2020 인터넷정보학회논문지 Vol.21 No.6
The consequences of wearing high heels can be different according to the heel height, gait speed, shoe design, heel base area, and shoe size. This study aimed to focus on the knee extension and flexion range of motion (ROM) during gait, which were challenged by wearing five different shoe heel types and two different self-selected gait speeds (comfortable and fast) as experimental conditions. Measurement standards of knee extension and flexion ROM were individually calibrated at the time of heel strike, mid-stance, toe-off, and stance phase based on the 2-minute video recordings of each gait condition. Seven healthy young women (20.7 ± 0.8 years) participated and they were asked to walk on a treadmill wearing the five given shoes at a self-selected comfortable speed (average of 2.4 ± 0.3 km/h) and a fast speed (average of 5.1 ± 0.2 km/h) in a random order. All of the shoes were in size 23.5 cm. Three of the given shoes were 9.0 cm in height, the other two were flat shoes and sneakers. A motion capture software (Kinovea 0.8.27) was used to measure the kinematic data; changes in the knee angles during each gait. During fast speed gait, the knee extension angles at heel strike and mid-stance were significantly decreased in all of the 3 high heels (p<0.05). The results revealed that fast gait speed causes knee flexion angle to significantly increase at toe-off in all five types of shoes. However, there was a significant difference in both the knee flexion and extension angles when the gait in stiletto heels and flat shoes were compared in fast gait condition (p<0.05). This showed that walking fast in high heels leads to abnormal knee ROM and thus can cause damages to the knee joints. The findings in this preliminary study can be a basis for future studies on the kinematic changes in the lower extremity during gait and for the analysis of causes and preventive methods for musculoskeletal injuries related to wearing high heels.
외골격 재활 로봇 제어를 위한 족저압 및 슬관절 각도 동시 측정 시스템 개발
김윤성(Yoon Sung Kim),김영(Young Kim),호종갑(Jong Gab Ho),장승완(Seungwan Jang),민세동(Se Dong Min) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 연구에서는 보행 중 입각기와 유각기에서의 슬관절 각도의 상태를 분석하기 위해 족저압과 슬관절 각도를 동시에 측정할 수 있는 시스템을 설계하였다. 피험자의 입각기와 유각기를 구분하기 위하여 FSR센서를 이용해 족저압을 측정하였고, 슬관절의 각도를 측정하기 위하여 3D 프린터를 이용해 하지에 부착할 수 있는 기구와 앱솔루트 엔코더를 이용해 슬관절의 각도를 측정하였다. 족저압과 슬관절 각도를 동시 측정함으로써, 슬관절의 폄 운동과 굽힘 운동 사이의 입각기가 유지됐으며, 각 구간별 시간을 측정함으로써 족저압과 슬관절 각도 사이의 상관관계를 알 수 있었다. 향후 외골격 재활 로봇에 관한 연구에서 보행자의 동작의도를 파악하여 외골격 재활 로봇의 모터를 제어할 수 있도록 하는 연구의 기초 연구이다.