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A novel method of using accelerometry for upper limb FES control

Sun, M; Kenney, L; Smith, CL; Waring, K; Luckie, HM; Liu, A; Howard, D

A novel method of using accelerometry for upper limb FES control Thumbnail


Authors

M Sun

CL Smith

K Waring

HM Luckie



Abstract

This paper reports on a novel approach to using a 3-axis accelerometer to capture body segment angle for upper limb functional electrical stimulation (FES) control. The approach calculates the angle between the accelerometer x-axis and the gravity vector, while avoiding poor sensitivity at certain angles and minimising errors when true acceleration is relatively large in comparison to gravity. This approach was incorporated into a state-machine controller which is used for the real-time control of FES during upper limb functional task performance. An experimental approach was used to validate the new method. Two participants with different upper limb impairments resulting from a stroke carried out four different FES-assisted tasks. Comparisons were made between angle calculated from arm-mounted accelerometer data using our algorithm and angle calculated from limb-mounted reflective marker data. After removal of coordinate misalignment error, mean error across tasks and subjects ranged between 1.4 and 2.9 degrees. The approach shows promise for use in the control of upper limb FES and other human movement applications where true acceleration is relatively small in comparison with gravity.

Citation

Sun, M., Kenney, L., Smith, C., Waring, K., Luckie, H., Liu, A., & Howard, D. (2016). A novel method of using accelerometry for upper limb FES control. Medical Engineering and Physics, 38(11), 1244-1250. https://doi.org/10.1016/j.medengphy.2016.06.005

Journal Article Type Article
Acceptance Date Jun 7, 2016
Online Publication Date Jul 1, 2016
Publication Date Nov 1, 2016
Deposit Date Jun 20, 2016
Publicly Available Date Jul 1, 2017
Journal Medical Engineering & Physics
Print ISSN 1350-4533
Electronic ISSN 1873-4030
Publisher Elsevier
Volume 38
Issue 11
Pages 1244-1250
DOI https://doi.org/10.1016/j.medengphy.2016.06.005
Publisher URL https://doi.org/10.1016/j.medengphy.2016.06.005
Related Public URLs http://www.journals.elsevier.com/medical-engineering-and-physics

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