Correlation Between Ankle Impedance and EMG Signals
The correlation of the lower-leg muscle contraction to the ankle impedance of unimpaired subjects is studied. Each subject participated in 5 experimental trials, each with a different co-contraction level: 0%, 10%, 20%, 30%, and 40% of their maximum voluntary contraction (MVC). A linear model is developed to relate the muscle contraction and the ankle impedance. Next, an ANOVA test is used to verify the significance of the parameters. Low correlation is found on the inversion-eversion degree-of-freedom of the ankle, suggesting non-linear models might be more effective in describing this relationship.
- 5.Dallali, H., Knop, L.N., Castelino, L., Ficanha, E.M., Rastgaar, M.: Using lower extremity muscle activity to obtain human ankle impedance in the external–internal direction. Int. J. Intell. Robot. Appl. (2017)Google Scholar
- 6.Ficanha, E.M., Ribeiro, G.A., Knop, L., Rastgaar, M.: Time-varying impedance of the human ankle in the sagittal and frontal planes during straight walk and turning steps. In: Presented at the International Conference on Rehabilitation Robotics, London, pp. 1413–1418 (2017)Google Scholar