Reliability of 3D-Inertia Measurement Unit Based Shoes in Gait Analysis

관성센서 기반 신발형 보행 분석기의 신뢰성 연구

  • Joo, Ji-Yong (Department of Physical Education, Graduate School, Chonnam National University) ;
  • Kim, Young-Kwan (Department of Physical Education, College of Education, Chonnam National University) ;
  • Park, Jae-Young (Department of Exercise Prescription, College of Health and Welfare, Dongshin University)
  • 주지용 (전남대학교 대학원 체육학과) ;
  • 김영관 (전남대학교 사범대학 체육교육과) ;
  • 박재영 (동신대학교 보건복지대학 운동처방학과)
  • Received : 2015.01.31
  • Accepted : 2015.03.20
  • Published : 2015.03.31


Purpose : The purpose of this study was to investigate the reliability of 3D-inertia measurement unit (IMU) based shoes in gait analysis. This was done with respect to the results of the optical motion capturing system and to collect reference gait data of healthy subjects with this device. Methods : The Smart Balance$^{(R)}$ system of 3D-IMU based shoes and Osprey$^{(R)}$ motion capturing cameras were used to collect motion data simultaneously. Forty four healthy subjects consisting of individuals in 20s (N=20), 40s (N=13), and 60s (N=11) participated in this study voluntarily. They performed natural walking on a treadmill for one minute at 4 different target speeds (3, 4, 5, 6 km/h), respectively. Results : Cadence (ICC=.998), step length (ICC=.970), stance phase (ICC=.845), and double-support phase (ICC=.684) from 3D-IMU based shoes were in agreement with results of optical motion system. Gait data of healthy subjects according to different treadmill speeds and ages were matched to previous literature showing increased cadence and reduced step length for elderly subjects. Conclusion : Conclusively, 3D-IMU based shoes in gait analysis were a satisfactory alternative option in measuring linear gait parameters.


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