Real-time pinch force estimation by surface electromyography using an artificial neural network

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The palmar pinch force estimation is highly relevant not only in biomechanical studies, the analysis of sports activities, and ergonomic design analyses but also in clinical applications such as rehabilitation, in which information about muscle forces influences the physician's decisions on diagnosis and treatment. Force transducers have been used for such purposes, but they are restricted to grasping points and inevitably interfere with the human haptic sense because fingers cannot directly touch the environmental surface. We propose an estimation method of the palmar pinch force using surface electromyography (SEMG). Three myoelectric sites on the skin were selected on the basis of anatomical considerations and a Fisher discriminant analysis (FDA), and SEMG at these sites yields suitable information for pinch force estimation. An artificial neural network (ANN) was implemented to map the SEMG to the force, and its structure was optimized to avoid both under- and over-fitting problems. The resulting network was tested using SEMG signals recorded from the selected myoelectric sites of ten subjects in real time. The training time for each subject was short (approximately 96 s), and the estimation results were promising, with a normalized root mean squared error (NRMSE) of 0.081 +/- 0.023 and a correlation (CORR) of 0.968 +/- 0.017. (C) 2010 IPEM. Published by Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2010-06
Language
English
Article Type
Article
Keywords

EMG SIGNALS; MYOELECTRIC SIGNAL; JOINT TORQUES; MUSCLE FORCES; GRIP FORCE; FINGER; MODELS; EXOSKELETON; INTERFACE; SYNERGIES

Citation

MEDICAL ENGINEERING & PHYSICS, v.32, no.5, pp.429 - 436

ISSN
1350-4533
DOI
10.1016/j.medengphy.2010.04.004
URI
http://hdl.handle.net/10203/99750
Appears in Collection
ME-Journal Papers(저널논문)
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