Validity and reliability assessment of joint angle measurement using inertial sensors placement on the examiner

DOI
  • JONO Yasutomo
    Department of Rehabilitation, Faculty of Health Science, Naragakuen University
  • NODA Yuki
    Department of Rehabilitation, Faculty of Health Science, Naragakuen University
  • MAEDA Yoshiki
    Department of Rehabilitation, Faculty of Health Science, Naragakuen University
  • YAMAMOTO Hidemi
    SunCity Kizu, Half Century More Co., Ltd.
  • IKEDA Koji
    Department of Rehabilitation, Faculty of Health Science, Naragakuen University

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Other Title
  • 計測者に設置した慣性センサによる関節角度計測の妥当性と信頼性の検討

Abstract

<p>Purpose: This study aimed to validate and assess the reliability of IMUrater, a method for measuring joint angles by placing Inertial Measurement Unit (IMU) sensors on the measurer's body.</p><p>Methods: Sixteen healthy adults were included, and the validity and reliability of IMUrater were compared with an optical motion capture (OMC) system using cameras for motion analysis.</p><p>Results: The coefficient of multiple correlation (CMC) and root mean square error (RMSE) between the IMUrater and the OMC-based method were 0.93 and 31.20 degrees, respectively. Within sessions, IMUrater showed a CMC of 0.95, a RMSE of 19.40 degrees, and an intraclass correlation coefficient (ICC) of 0.92, while between sessions, the values were 0.85, 35.74 degrees, and 0.19, respectively.</p><p>Conclusion: IMUrater demonstrated high validity in relative joint angles. Within-session reliability was high, with strong agreement in time series waveform data indicated by CMC. However, between-session reliability showed lower agreement, with substantial discrepancies observed in absolute angle measurements.</p>

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