Lower extremity joint angle tracking with wireless ultrasonic sensors during a squat exercise
This paper presents an unrestrained measurement system based on a wearable wireless ultrasonic sensor network to track the lower extremity joint and trunk kinematics during a squat exercise with only one ultrasonic sensor attached to the trunk. The system consists of an ultrasound transmitter (mobil...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2015
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| Online Access: | https://hdl.handle.net/10356/107381 http://hdl.handle.net/10220/25566 |
| _version_ | 1826109537441021952 |
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| author | Soh, Cheong Boon Gunawan, Erry Low, Kay-Soon Thomas, Rijil Qi, Yongbin |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Soh, Cheong Boon Gunawan, Erry Low, Kay-Soon Thomas, Rijil Qi, Yongbin |
| author_sort | Soh, Cheong Boon |
| collection | NTU |
| description | This paper presents an unrestrained measurement system based on a wearable wireless ultrasonic sensor network to track the lower extremity joint and trunk kinematics during a squat exercise with only one ultrasonic sensor attached to the trunk. The system consists of an ultrasound transmitter (mobile) and multiple receivers (anchors) whose positions are known. The proposed system measures the horizontal and vertical displacement, together with known joint constraints, to estimate joint flexion/extension angles using an inverse kinematic model based on the damped least-squares technique. The performance of the proposed ultrasonic measurement system was validated against a camera-based tracking system on eight healthy subjects performing a planar squat exercise. Joint angles estimated from the ultrasonic system showed a root mean square error (RMSE) of 2.85° ± 0.57° with the reference system. Statistical analysis indicated great agreements between these two systems with a Pearson’s correlation coefficient (PCC) value larger than 0.99 for all joint angles’ estimation. These results show that the proposed ultrasonic measurement system is useful for applications, such as rehabilitation and sports. |
| first_indexed | 2024-10-01T02:19:51Z |
| format | Journal Article |
| id | ntu-10356/107381 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:19:51Z |
| publishDate | 2015 |
| record_format | dspace |
| spelling | ntu-10356/1073812022-02-16T16:26:51Z Lower extremity joint angle tracking with wireless ultrasonic sensors during a squat exercise Soh, Cheong Boon Gunawan, Erry Low, Kay-Soon Thomas, Rijil Qi, Yongbin School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering This paper presents an unrestrained measurement system based on a wearable wireless ultrasonic sensor network to track the lower extremity joint and trunk kinematics during a squat exercise with only one ultrasonic sensor attached to the trunk. The system consists of an ultrasound transmitter (mobile) and multiple receivers (anchors) whose positions are known. The proposed system measures the horizontal and vertical displacement, together with known joint constraints, to estimate joint flexion/extension angles using an inverse kinematic model based on the damped least-squares technique. The performance of the proposed ultrasonic measurement system was validated against a camera-based tracking system on eight healthy subjects performing a planar squat exercise. Joint angles estimated from the ultrasonic system showed a root mean square error (RMSE) of 2.85° ± 0.57° with the reference system. Statistical analysis indicated great agreements between these two systems with a Pearson’s correlation coefficient (PCC) value larger than 0.99 for all joint angles’ estimation. These results show that the proposed ultrasonic measurement system is useful for applications, such as rehabilitation and sports. Published version 2015-05-18T02:44:54Z 2019-12-06T22:29:42Z 2015-05-18T02:44:54Z 2019-12-06T22:29:42Z 2015 2015 Journal Article Qi, Y., Soh, C., Gunawan, E., Low, K.-S., & Thomas, R. (2015). Lower extremity joint angle tracking with wireless ultrasonic sensors during a squat exercise. Sensors, 15(5), 9610-9627. 1424-8220 https://hdl.handle.net/10356/107381 http://hdl.handle.net/10220/25566 10.3390/s150509610 25915589 en Sensors © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/). 18 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering Soh, Cheong Boon Gunawan, Erry Low, Kay-Soon Thomas, Rijil Qi, Yongbin Lower extremity joint angle tracking with wireless ultrasonic sensors during a squat exercise |
| title | Lower extremity joint angle tracking with wireless ultrasonic sensors during a squat exercise |
| title_full | Lower extremity joint angle tracking with wireless ultrasonic sensors during a squat exercise |
| title_fullStr | Lower extremity joint angle tracking with wireless ultrasonic sensors during a squat exercise |
| title_full_unstemmed | Lower extremity joint angle tracking with wireless ultrasonic sensors during a squat exercise |
| title_short | Lower extremity joint angle tracking with wireless ultrasonic sensors during a squat exercise |
| title_sort | lower extremity joint angle tracking with wireless ultrasonic sensors during a squat exercise |
| topic | DRNTU::Engineering::Electrical and electronic engineering |
| url | https://hdl.handle.net/10356/107381 http://hdl.handle.net/10220/25566 |
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