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Estimation Accuracy of Step Length by Acceleration Signals: Comparison Among Three Different Sensor Locations

  • Tomoya Ueda
  • Naoto Takayanagi
  • Yoshiyuki Kobayashi
  • Motoki Sudo
  • Hiroyasu Miwa
  • Hiroaki Hobara
  • Satoru Hashizume
  • Kanako Nakajima
  • Yoshifumi Niki
  • Masaaki Mochimaru
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 818)

Abstract

Methods to estimate step length using accelerometers are gaining attention in recent times. However, the influence of the sensor location on the accuracy of step length estimation is still unknown for models fabricated in a uniform manner. Therefore, the purpose of this study was to compare the accuracy of step length estimations among the following three body parts: ankle, pelvis, and wrist. Ten time-normalized acceleration signals from one gait cycle were obtained from 247 healthy adults aged 20 to 77 while walking barefoot at a comfortable, self-selected speed. Linear multiple regression analyses with leave-one-participant-out cross validation technique were used to build the algorithms. The absolute value of mean error for each participant (AME) was computed to compare the accuracies among the body parts. Mean (standard deviation) values of AME for each part were as follows: ankle, 2.66 (2.24) cm; pelvis, 3.09 (2.39) cm; and wrist, 4.05 (3.01) cm. Statistical analyses revealed significant differences for the ankle–wrist and pelvis–wrist estimations. We found that step length can be estimated from the acceleration signal of the ankle or pelvis with almost the same accuracy (approximately 3 cm of average error between participants). Also, estimation of step lengths with the acceleration signals obtained from the wrist needs to be conducted more carefully than those obtained from the ankle or pelvis.

Keywords

Step length estimation Acceleration signal Sensor location 

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Tokyo Research LaboratoriesTokyoJapan
  2. 2.Digital Human Research GroupHuman Informatics Research Institute, National Institute of Advanced Industrial Science and TechnologyTokyoJapan

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