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Sensors 2019, 19(8), 1782; https://doi.org/10.3390/s19081782

Inertial Measurement Unit Based Upper Extremity Motion Characterization for Action Research Arm Test and Activities of Daily Living

1
Department of Biomedical Engineering, Seoul National University College of Medicine, Seoul 03080, Korea
2
Department of Rehabilitation Medicine, Seoul National University Hospital, Seoul 03080, Korea
3
Interdisciplinary Program for Bioengineering, Seoul National University Graduate School, Seoul 08826, Korea
4
Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul 03080, Korea
5
Institute of Medical and Biological Engineering, Seoul National University, Seoul 03080, Korea
*
Authors to whom correspondence should be addressed.
Received: 18 March 2019 / Revised: 9 April 2019 / Accepted: 12 April 2019 / Published: 14 April 2019
(This article belongs to the Special Issue Data Analytics and Applications of the Wearable Sensors in Healthcare)
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Abstract

In practical rehabilitation robot development, it is imperative to pre-specify the critical workspace to prevent redundant structure. This study aimed to characterize the upper extremity motion during essential activities in daily living. An IMU-based wearable motion capture system was used to access arm movements. Ten healthy subjects performed the Action Research Arm Test (ARAT) and six pre-selected essential daily activities. The Euler angles of the major joints, and acceleration from wrist and hand sensors were acquired and analyzed. The size of the workspace for the ARAT was 0.53 (left-right) × 0.92 (front-back) × 0.89 (up-down) m for the dominant hand. For the daily activities, the workspace size was 0.71 × 0.70 × 0.86 m for the dominant hand, significantly larger than the non-dominant hand (p ≤ 0.011). The average range of motion (RoM) during ARAT was 109.15 ± 18.82° for elbow flexion/extension, 105.23 ± 5.38° for forearm supination/pronation, 91.99 ± 0.98° for shoulder internal/external rotation, and 82.90 ± 22.52° for wrist dorsiflexion/volarflexion, whereas the corresponding range for daily activities were 120.61 ± 23.64°, 128.09 ± 22.04°, 111.56 ± 31.88°, and 113.70 ± 18.26°. The shoulder joint was more abducted and extended during pinching compared to grasping posture (p < 0.001). Reaching from a grasping posture required approximately 70° elbow extension and 36° forearm supination from the initial position. The study results provide an important database for the workspace and RoM for essential arm movements. View Full-Text
Keywords: inertial measurement unit; upper extremity; motion; action research arm test; activities of daily living inertial measurement unit; upper extremity; motion; action research arm test; activities of daily living
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nam, H.S.; Lee, W.H.; Seo, H.G.; Kim, Y.J.; Bang, M.S.; Kim, S. Inertial Measurement Unit Based Upper Extremity Motion Characterization for Action Research Arm Test and Activities of Daily Living. Sensors 2019, 19, 1782.

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