Hysteresis in the electromyography–force relationship: Toward an optimal model for the estimation of force
Article first published online: 19 SEP 2012
Copyright © 2012 Wiley Periodicals, Inc.
Muscle & Nerve
Volume 46, Issue 5, pages 755–758, November 2012
How to Cite
Kamavuako, E. N. and Rosenvang, J. C. (2012), Hysteresis in the electromyography–force relationship: Toward an optimal model for the estimation of force. Muscle Nerve, 46: 755–758. doi: 10.1002/mus.23393
- Issue published online: 10 OCT 2012
- Article first published online: 19 SEP 2012
- Accepted manuscript online: 27 MAR 2012 06:03AM EST
- Manuscript Accepted: 19 MAR 2012
- Danish Agency for Science, Technology and Innovation (Council for Independent Research, Technology and Production Sciences). Grant Number: 10-080813
- grasping force;
- intramuscular EMG;
- path dependency;
- surface EMG
In this study we analyzed the presence of hysteresis in the relationship between features of electromyography (EMG) and force.
Intramuscular EMG and surface EMG (sEMG) were recorded concurrently from the flexor digitorum profundus muscle from 0% to 100% maximum voluntary contraction (MVC) in 11 subjects. Two features, mean absolute value (MAV) and Wilson amplitude (WAMP), were computed using either the first-order (poly1) or third-order (poly3) polynomial.
We detected hysteresis in the EMG–force relationship for both features in all subjects. In general, the hysteresis-based models performed better than the overall model (which does not take into account the hysteresis in the EMG–force relationship), with R2 values about 0.98 (averaged across subjects) and root mean square error around 5% of the MVC force.
These results imply the existence of a path-dependent model, which may improve the accuracy of force estimation. Muscle Nerve, 2012